Cannot find symbol class Closeable in NanoHTTPD class

[bakyaraj008]

In NanoHTTPD class i have imported "io.closeable" but still i am getting cannot find symbol closeable. Below is my code sample for NanoHTTPD.

public abstract class NanoHTTPD {

/**
 * Pluggable strategy for asynchronously executing requests.
 */
public interface AsyncRunner {

    void closeAll();

    void closed(ClientHandler clientHandler);

    void exec(ClientHandler code);
}

/**
 * The runnable that will be used for every new client connection.
 */
public class ClientHandler implements Runnable {

    private final InputStream inputStream;

    private final Socket acceptSocket;

    public ClientHandler(InputStream inputStream, Socket acceptSocket) {
        this.inputStream = inputStream;
        this.acceptSocket = acceptSocket;
    }

    public void close() {
        safeClose(this.inputStream);
        safeClose(this.acceptSocket);
    }

    @Override
    public void run() {
        OutputStream outputStream = null;
        try {
            outputStream = this.acceptSocket.getOutputStream();
            TempFileManager tempFileManager = NanoHTTPD.this.tempFileManagerFactory.create();
            HTTPSession session = new HTTPSession(tempFileManager, this.inputStream, outputStream, this.acceptSocket.getInetAddress());
            while (!this.acceptSocket.isClosed()) {
                session.execute();
            }
        } catch (Exception e) {
            // When the socket is closed by the client,
            // we throw our own SocketException
            // to break the "keep alive" loop above. If
            // the exception was anything other
            // than the expected SocketException OR a
            // SocketTimeoutException, print the
            // stacktrace
            if (!(e instanceof SocketException && "NanoHttpd Shutdown".equals(e.getMessage())) && !(e instanceof SocketTimeoutException)) {
                NanoHTTPD.LOG.log(Level.SEVERE, "Communication with the client broken, or an bug in the handler code", e);
            }
        } finally {
            safeClose(outputStream);
            safeClose(this.inputStream);
            safeClose(this.acceptSocket);
            NanoHTTPD.this.asyncRunner.closed(this);
        }
    }
}

public static class Cookie {

    public static String getHTTPTime(int days) {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
        dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        calendar.add(Calendar.DAY_OF_MONTH, days);
        return dateFormat.format(calendar.getTime());
    }

    private final String n, v, e;

    public Cookie(String name, String value) {
        this(name, value, 30);
    }

    public Cookie(String name, String value, int numDays) {
        this.n = name;
        this.v = value;
        this.e = getHTTPTime(numDays);
    }

    public Cookie(String name, String value, String expires) {
        this.n = name;
        this.v = value;
        this.e = expires;
    }

    public String getHTTPHeader() {
        String fmt = "%s=%s; expires=%s";
        return String.format(fmt, this.n, this.v, this.e);
    }
}

/**
 * Provides rudimentary support for cookies. Doesn't support 'path',
 * 'secure' nor 'httpOnly'. Feel free to improve it and/or add unsupported
 * features.
 *
 * @author LordFokas
 */
public class CookieHandler implements Iterable<String> {

    private final HashMap<String, String> cookies = new HashMap<String, String>();

    private final ArrayList<Cookie> queue = new ArrayList<Cookie>();

    public CookieHandler(Map<String, String> httpHeaders) {
        String raw = httpHeaders.get("cookie");
        if (raw != null) {
            String[] tokens = raw.split(";");
            for (String token : tokens) {
                String[] data = token.trim().split("=");
                if (data.length == 2) {
                    this.cookies.put(data[0], data[1]);
                }
            }
        }
    }

    /**
     * Set a cookie with an expiration date from a month ago, effectively
     * deleting it on the client side.
     *
     * @param name
     *            The cookie name.
     */
    public void delete(String name) {
        set(name, "-delete-", -30);
    }

    @Override
    public Iterator<String> iterator() {
        return this.cookies.keySet().iterator();
    }

    /**
     * Read a cookie from the HTTP Headers.
     *
     * @param name
     *            The cookie's name.
     * @return The cookie's value if it exists, null otherwise.
     */
    public String read(String name) {
        return this.cookies.get(name);
    }

    public void set(Cookie cookie) {
        this.queue.add(cookie);
    }

    /**
     * Sets a cookie.
     *
     * @param name
     *            The cookie's name.
     * @param value
     *            The cookie's value.
     * @param expires
     *            How many days until the cookie expires.
     */
    public void set(String name, String value, int expires) {
        this.queue.add(new Cookie(name, value, Cookie.getHTTPTime(expires)));
    }

    /**
     * Internally used by the webserver to add all queued cookies into the
     * Response's HTTP Headers.
     *
     * @param response
     *            The Response object to which headers the queued cookies
     *            will be added.
     */
    public void unloadQueue(Response response) {
        for (Cookie cookie : this.queue) {
            response.addHeader("Set-Cookie", cookie.getHTTPHeader());
        }
    }
}

/**
 * Default threading strategy for NanoHTTPD.
 * <p/>
 * <p>
 * By default, the server spawns a new Thread for every incoming request.
 * These are set to <i>daemon</i> status, and named according to the request
 * number. The name is useful when profiling the application.
 * </p>
 */
public static class DefaultAsyncRunner implements AsyncRunner {

    private long requestCount;

    private final List<ClientHandler> running = Collections.synchronizedList(new ArrayList<ClientHandler>());

    /**
     * @return a list with currently running clients.
     */
    public List<ClientHandler> getRunning() {
        return running;
    }

    @Override
    public void closeAll() {
        // copy of the list for concurrency
        for (ClientHandler clientHandler : new ArrayList<ClientHandler>(this.running)) {
            clientHandler.close();
        }
    }

    @Override
    public void closed(ClientHandler clientHandler) {
        this.running.remove(clientHandler);
    }

    @Override
    public void exec(ClientHandler clientHandler) {
        ++this.requestCount;
        Thread t = new Thread(clientHandler);
        t.setDaemon(true);
        t.setName("NanoHttpd Request Processor (#" + this.requestCount + ")");
        this.running.add(clientHandler);
        t.start();
    }
}

/**
 * Default strategy for creating and cleaning up temporary files.
 * <p/>
 * <p>
 * By default, files are created by <code>File.createTempFile()</code> in
 * the directory specified.
 * </p>
 */
public static class DefaultTempFile implements TempFile {

    private final File file;

    private final OutputStream fstream;

    public DefaultTempFile(File tempdir) throws IOException {
        this.file = File.createTempFile("NanoHTTPD-", "", tempdir);
        this.fstream = new FileOutputStream(this.file);
    }

    @Override
    public void delete() throws Exception {
        safeClose(this.fstream);
        if (!this.file.delete()) {
            throw new Exception("could not delete temporary file: " + this.file.getAbsolutePath());
        }
    }

    @Override
    public String getName() {
        return this.file.getAbsolutePath();
    }

    @Override
    public OutputStream open() throws Exception {
        return this.fstream;
    }
}

/**
 * Default strategy for creating and cleaning up temporary files.
 * <p/>
 * <p>
 * This class stores its files in the standard location (that is, wherever
 * <code>java.io.tmpdir</code> points to). Files are added to an internal
 * list, and deleted when no longer needed (that is, when
 * <code>clear()</code> is invoked at the end of processing a request).
 * </p>
 */
public static class DefaultTempFileManager implements TempFileManager {

    private final File tmpdir;

    private final List<TempFile> tempFiles;

    public DefaultTempFileManager() {
        this.tmpdir = new File(System.getProperty("java.io.tmpdir"));
        if (!tmpdir.exists()) {
            tmpdir.mkdirs();
        }
        this.tempFiles = new ArrayList<TempFile>();
    }

    @Override
    public void clear() {
        for (TempFile file : this.tempFiles) {
            try {
                file.delete();
            } catch (Exception ignored) {
                NanoHTTPD.LOG.log(Level.WARNING, "could not delete file ", ignored);
            }
        }
        this.tempFiles.clear();
    }

    @Override
    public TempFile createTempFile(String filename_hint) throws Exception {
        DefaultTempFile tempFile = new DefaultTempFile(this.tmpdir);
        this.tempFiles.add(tempFile);
        return tempFile;
    }
}

/**
 * Default strategy for creating and cleaning up temporary files.
 */
private class DefaultTempFileManagerFactory implements TempFileManagerFactory {

    @Override
    public TempFileManager create() {
        return new DefaultTempFileManager();
    }
}

/**
 * Creates a normal ServerSocket for TCP connections
 */
public static class DefaultServerSocketFactory implements ServerSocketFactory {

    @Override
    public ServerSocket create() throws IOException {
        return new ServerSocket();
    }

}

/**
 * Creates a new SSLServerSocket
 */
public static class SecureServerSocketFactory implements ServerSocketFactory {

    private SSLServerSocketFactory sslServerSocketFactory;

    private String[] sslProtocols;

    public SecureServerSocketFactory(SSLServerSocketFactory sslServerSocketFactory, String[] sslProtocols) {
        this.sslServerSocketFactory = sslServerSocketFactory;
        this.sslProtocols = sslProtocols;
    }

    @Override
    public ServerSocket create() throws IOException {
        SSLServerSocket ss = null;
        ss = (SSLServerSocket) this.sslServerSocketFactory.createServerSocket();
        if (this.sslProtocols != null) {
            ss.setEnabledProtocols(this.sslProtocols);
        } else {
            ss.setEnabledProtocols(ss.getSupportedProtocols());
        }
        ss.setUseClientMode(false);
        ss.setWantClientAuth(false);
        ss.setNeedClientAuth(false);
        return ss;
    }

}

private static final String CONTENT_DISPOSITION_REGEX = "([ |\t]*Content-Disposition[ |\t]*:)(.*)";

private static final Pattern CONTENT_DISPOSITION_PATTERN = Pattern.compile(CONTENT_DISPOSITION_REGEX, Pattern.CASE_INSENSITIVE);

private static final String CONTENT_TYPE_REGEX = "([ |\t]*content-type[ |\t]*:)(.*)";

private static final Pattern CONTENT_TYPE_PATTERN = Pattern.compile(CONTENT_TYPE_REGEX, Pattern.CASE_INSENSITIVE);

private static final String CONTENT_DISPOSITION_ATTRIBUTE_REGEX = "[ |\t]*([a-zA-Z]*)[ |\t]*=[ |\t]*['|\"]([^\"^']*)['|\"]";

private static final Pattern CONTENT_DISPOSITION_ATTRIBUTE_PATTERN = Pattern.compile(CONTENT_DISPOSITION_ATTRIBUTE_REGEX);

protected static class ContentType {

    private static final String ASCII_ENCODING = "US-ASCII";

    private static final String MULTIPART_FORM_DATA_HEADER = "multipart/form-data";

    private static final String CONTENT_REGEX = "[ |\t]*([^/^ ^;^,]+/[^ ^;^,]+)";

    private static final Pattern MIME_PATTERN = Pattern.compile(CONTENT_REGEX, Pattern.CASE_INSENSITIVE);

    private static final String CHARSET_REGEX = "[ |\t]*(charset)[ |\t]*=[ |\t]*['|\"]?([^\"^'^;^,]*)['|\"]?";

    private static final Pattern CHARSET_PATTERN = Pattern.compile(CHARSET_REGEX, Pattern.CASE_INSENSITIVE);

    private static final String BOUNDARY_REGEX = "[ |\t]*(boundary)[ |\t]*=[ |\t]*['|\"]?([^\"^'^;^,]*)['|\"]?";

    private static final Pattern BOUNDARY_PATTERN = Pattern.compile(BOUNDARY_REGEX, Pattern.CASE_INSENSITIVE);

    private final String contentTypeHeader;

    private final String contentType;

    private final String encoding;

    private final String boundary;

    public ContentType(String contentTypeHeader) {
        this.contentTypeHeader = contentTypeHeader;
        if (contentTypeHeader != null) {
            contentType = getDetailFromContentHeader(contentTypeHeader, MIME_PATTERN, "", 1);
            encoding = getDetailFromContentHeader(contentTypeHeader, CHARSET_PATTERN, null, 2);
        } else {
            contentType = "";
            encoding = "UTF-8";
        }
        if (MULTIPART_FORM_DATA_HEADER.equalsIgnoreCase(contentType)) {
            boundary = getDetailFromContentHeader(contentTypeHeader, BOUNDARY_PATTERN, null, 2);
        } else {
            boundary = null;
        }
    }

    private String getDetailFromContentHeader(String contentTypeHeader, Pattern pattern, String defaultValue, int group) {
        Matcher matcher = pattern.matcher(contentTypeHeader);
        return matcher.find() ? matcher.group(group) : defaultValue;
    }

    public String getContentTypeHeader() {
        return contentTypeHeader;
    }

    public String getContentType() {
        return contentType;
    }

    public String getEncoding() {
        return encoding == null ? ASCII_ENCODING : encoding;
    }

    public String getBoundary() {
        return boundary;
    }

    public boolean isMultipart() {
        return MULTIPART_FORM_DATA_HEADER.equalsIgnoreCase(contentType);
    }

    public ContentType tryUTF8() {
        if (encoding == null) {
            return new ContentType(this.contentTypeHeader + "; charset=UTF-8");
        }
        return this;
    }
}

protected class HTTPSession implements IHTTPSession {

    private static final int REQUEST_BUFFER_LEN = 512;

    private static final int MEMORY_STORE_LIMIT = 1024;

    public static final int BUFSIZE = 8192;

    public static final int MAX_HEADER_SIZE = 1024;

    private final TempFileManager tempFileManager;

    private final OutputStream outputStream;

    private final BufferedInputStream inputStream;

    private int splitbyte;

    private int rlen;

    private String uri;

    private Method method;

    private Map<String, List<String>> parms;

    private Map<String, String> headers;

    private CookieHandler cookies;

    private String queryParameterString;

    private String remoteIp;

    private String remoteHostname;

    private String protocolVersion;

    public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream) {
        this.tempFileManager = tempFileManager;
        this.inputStream = new BufferedInputStream(inputStream, HTTPSession.BUFSIZE);
        this.outputStream = outputStream;
    }

    public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream, InetAddress inetAddress) {
        this.tempFileManager = tempFileManager;
        this.inputStream = new BufferedInputStream(inputStream, HTTPSession.BUFSIZE);
        this.outputStream = outputStream;
        this.remoteIp = inetAddress.isLoopbackAddress() || inetAddress.isAnyLocalAddress() ? "127.0.0.1" : inetAddress.getHostAddress().toString();
        this.remoteHostname = inetAddress.isLoopbackAddress() || inetAddress.isAnyLocalAddress() ? "localhost" : inetAddress.getHostName().toString();
        this.headers = new HashMap<String, String>();
    }

    /**
     * Decodes the sent headers and loads the data into Key/value pairs
     */
    private void decodeHeader(BufferedReader in, Map<String, String> pre, Map<String, List<String>> parms, Map<String, String> headers) throws ResponseException {
        try {
            // Read the request line
            String inLine = in.readLine();
            if (inLine == null) {
                return;
            }

            StringTokenizer st = new StringTokenizer(inLine);
            if (!st.hasMoreTokens()) {
                throw new ResponseException(Status.BAD_REQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html");
            }

            pre.put("method", st.nextToken());

            if (!st.hasMoreTokens()) {
                throw new ResponseException(Status.BAD_REQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html");
            }

            String uri = st.nextToken();

            // Decode parameters from the URI
            int qmi = uri.indexOf('?');
            if (qmi >= 0) {
                decodeParms(uri.substring(qmi + 1), parms);
                uri = decodePercent(uri.substring(0, qmi));
            } else {
                uri = decodePercent(uri);
            }

            // If there's another token, its protocol version,
            // followed by HTTP headers.
            // NOTE: this now forces header names lower case since they are
            // case insensitive and vary by client.
            if (st.hasMoreTokens()) {
                protocolVersion = st.nextToken();
            } else {
                protocolVersion = "HTTP/1.1";
                NanoHTTPD.LOG.log(Level.FINE, "no protocol version specified, strange. Assuming HTTP/1.1.");
            }
            String line = in.readLine();
            while (line != null && !line.trim().isEmpty()) {
                int p = line.indexOf(':');
                if (p >= 0) {
                    headers.put(line.substring(0, p).trim().toLowerCase(Locale.US), line.substring(p + 1).trim());
                }
                line = in.readLine();
            }

            pre.put("uri", uri);
        } catch (IOException ioe) {
            throw new ResponseException(Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage(), ioe);
        }
    }

    /**
     * Decodes the Multipart Body data and put it into Key/Value pairs.
     */
    private void decodeMultipartFormData(ContentType contentType, ByteBuffer fbuf, Map<String, List<String>> parms, Map<String, String> files) throws ResponseException {
        int pcount = 0;
        try {
            int[] boundaryIdxs = getBoundaryPositions(fbuf, contentType.getBoundary().getBytes());
            if (boundaryIdxs.length < 2) {
                throw new ResponseException(Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but contains less than two boundary strings.");
            }

            byte[] partHeaderBuff = new byte[MAX_HEADER_SIZE];
            for (int boundaryIdx = 0; boundaryIdx < boundaryIdxs.length - 1; boundaryIdx++) {
                fbuf.position(boundaryIdxs[boundaryIdx]);
                int len = (fbuf.remaining() < MAX_HEADER_SIZE) ? fbuf.remaining() : MAX_HEADER_SIZE;
                fbuf.get(partHeaderBuff, 0, len);
                BufferedReader in =
                        new BufferedReader(new InputStreamReader(new ByteArrayInputStream(partHeaderBuff, 0, len), Charset.forName(contentType.getEncoding())), len);

                int headerLines = 0;
                // First line is boundary string
                String mpline = in.readLine();
                headerLines++;
                if (mpline == null || !mpline.contains(contentType.getBoundary())) {
                    throw new ResponseException(Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but chunk does not start with boundary.");
                }

                String partName = null, fileName = null, partContentType = null;
                // Parse the reset of the header lines
                mpline = in.readLine();
                headerLines++;
                while (mpline != null && mpline.trim().length() > 0) {
                    Matcher matcher = CONTENT_DISPOSITION_PATTERN.matcher(mpline);
                    if (matcher.matches()) {
                        String attributeString = matcher.group(2);
                        matcher = CONTENT_DISPOSITION_ATTRIBUTE_PATTERN.matcher(attributeString);
                        while (matcher.find()) {
                            String key = matcher.group(1);
                            if ("name".equalsIgnoreCase(key)) {
                                partName = matcher.group(2);
                            } else if ("filename".equalsIgnoreCase(key)) {
                                fileName = matcher.group(2);
                                // add these two line to support multiple
                                // files uploaded using the same field Id
                                if (!fileName.isEmpty()) {
                                    if (pcount > 0)
                                        partName = partName + String.valueOf(pcount++);
                                    else
                                        pcount++;
                                }
                            }
                        }
                    }
                    matcher = CONTENT_TYPE_PATTERN.matcher(mpline);
                    if (matcher.matches()) {
                        partContentType = matcher.group(2).trim();
                    }
                    mpline = in.readLine();
                    headerLines++;
                }
                int partHeaderLength = 0;
                while (headerLines-- > 0) {
                    partHeaderLength = scipOverNewLine(partHeaderBuff, partHeaderLength);
                }
                // Read the part data
                if (partHeaderLength >= len - 4) {
                    throw new ResponseException(Status.INTERNAL_ERROR, "Multipart header size exceeds MAX_HEADER_SIZE.");
                }
                int partDataStart = boundaryIdxs[boundaryIdx] + partHeaderLength;
                int partDataEnd = boundaryIdxs[boundaryIdx + 1] - 4;

                fbuf.position(partDataStart);

                List<String> values = parms.get(partName);
                if (values == null) {
                    values = new ArrayList<String>();
                    parms.put(partName, values);
                }

                if (partContentType == null) {
                    // Read the part into a string
                    byte[] data_bytes = new byte[partDataEnd - partDataStart];
                    fbuf.get(data_bytes);

                    values.add(new String(data_bytes, contentType.getEncoding()));
                } else {
                    // Read it into a file
                    String path = saveTmpFile(fbuf, partDataStart, partDataEnd - partDataStart, fileName);
                    if (!files.containsKey(partName)) {
                        files.put(partName, path);
                    } else {
                        int count = 2;
                        while (files.containsKey(partName + count)) {
                            count++;
                        }
                        files.put(partName + count, path);
                    }
                    values.add(fileName);
                }
            }
        } catch (ResponseException re) {
            throw re;
        } catch (Exception e) {
            throw new ResponseException(Status.INTERNAL_ERROR, e.toString());
        }
    }

    private int scipOverNewLine(byte[] partHeaderBuff, int index) {
        while (partHeaderBuff[index] != '\n') {
            index++;
        }
        return ++index;
    }

    /**
     * Decodes parameters in percent-encoded URI-format ( e.g.
     * "name=Jack%20Daniels&pass=Single%20Malt" ) and adds them to given
     * Map.
     */
    private void decodeParms(String parms, Map<String, List<String>> p) {
        if (parms == null) {
            this.queryParameterString = "";
            return;
        }

        this.queryParameterString = parms;
        StringTokenizer st = new StringTokenizer(parms, "&");
        while (st.hasMoreTokens()) {
            String e = st.nextToken();
            int sep = e.indexOf('=');
            String key = null;
            String value = null;

            if (sep >= 0) {
                key = decodePercent(e.substring(0, sep)).trim();
                value = decodePercent(e.substring(sep + 1));
            } else {
                key = decodePercent(e).trim();
                value = "";
            }

            List<String> values = p.get(key);
            if (values == null) {
                values = new ArrayList<String>();
                p.put(key, values);
            }

            values.add(value);
        }
    }

    @Override
    public void execute() throws IOException {
        Response r = null;
        try {
            // Read the first 8192 bytes.
            // The full header should fit in here.
            // Apache's default header limit is 8KB.
            // Do NOT assume that a single read will get the entire header
            // at once!
            byte[] buf = new byte[HTTPSession.BUFSIZE];
            this.splitbyte = 0;
            this.rlen = 0;

            int read = -1;
            this.inputStream.mark(HTTPSession.BUFSIZE);
            try {
                read = this.inputStream.read(buf, 0, HTTPSession.BUFSIZE);
            } catch (SSLException e) {
                throw e;
            } catch (IOException e) {
                safeClose(this.inputStream);
                safeClose(this.outputStream);
                throw new SocketException("NanoHttpd Shutdown");
            }
            if (read == -1) {
                // socket was been closed
                safeClose(this.inputStream);
                safeClose(this.outputStream);
                throw new SocketException("NanoHttpd Shutdown");
            }
            while (read > 0) {
                this.rlen += read;
                this.splitbyte = findHeaderEnd(buf, this.rlen);
                if (this.splitbyte > 0) {
                    break;
                }
                read = this.inputStream.read(buf, this.rlen, HTTPSession.BUFSIZE - this.rlen);
            }

            if (this.splitbyte < this.rlen) {
                this.inputStream.reset();
                this.inputStream.skip(this.splitbyte);
            }

            this.parms = new HashMap<String, List<String>>();
            if (null == this.headers) {
                this.headers = new HashMap<String, String>();
            } else {
                this.headers.clear();
            }

            // Create a BufferedReader for parsing the header.
            BufferedReader hin = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(buf, 0, this.rlen)));

            // Decode the header into parms and header java properties
            Map<String, String> pre = new HashMap<String, String>();
            decodeHeader(hin, pre, this.parms, this.headers);

            if (null != this.remoteIp) {
                this.headers.put("remote-addr", this.remoteIp);
                this.headers.put("http-client-ip", this.remoteIp);
            }

            this.method = Method.lookup(pre.get("method"));
            if (this.method == null) {
                throw new ResponseException(Status.BAD_REQUEST, "BAD REQUEST: Syntax error. HTTP verb " + pre.get("method") + " unhandled.");
            }

            this.uri = pre.get("uri");

            this.cookies = new CookieHandler(this.headers);

            String connection = this.headers.get("connection");
            boolean keepAlive = "HTTP/1.1".equals(protocolVersion) && (connection == null || !connection.matches("(?i).*close.*"));

            // Ok, now do the serve()

            // TODO: long body_size = getBodySize();
            // TODO: long pos_before_serve = this.inputStream.totalRead()
            // (requires implementation for totalRead())
            r = serve(this);
            // TODO: this.inputStream.skip(body_size -
            // (this.inputStream.totalRead() - pos_before_serve))

            if (r == null) {
                throw new ResponseException(Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: Serve() returned a null response.");
            } else {
                String acceptEncoding = this.headers.get("accept-encoding");
                this.cookies.unloadQueue(r);
                r.setRequestMethod(this.method);
                r.setGzipEncoding(useGzipWhenAccepted(r) && acceptEncoding != null && acceptEncoding.contains("gzip"));
                r.setKeepAlive(keepAlive);
                r.send(this.outputStream);
            }
            if (!keepAlive || r.isCloseConnection()) {
                throw new SocketException("NanoHttpd Shutdown");
            }
        } catch (SocketException e) {
            // throw it out to close socket object (finalAccept)
            throw e;
        } catch (SocketTimeoutException ste) {
            // treat socket timeouts the same way we treat socket exceptions
            // i.e. close the stream & finalAccept object by throwing the
            // exception up the call stack.
            throw ste;
        } catch (SSLException ssle) {
            Response resp = newFixedLengthResponse(Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, "SSL PROTOCOL FAILURE: " + ssle.getMessage());
            resp.send(this.outputStream);
            safeClose(this.outputStream);
        } catch (IOException ioe) {
            Response resp = newFixedLengthResponse(Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
            resp.send(this.outputStream);
            safeClose(this.outputStream);
        } catch (ResponseException re) {
            Response resp = newFixedLengthResponse(re.getStatus(), NanoHTTPD.MIME_PLAINTEXT, re.getMessage());
            resp.send(this.outputStream);
            safeClose(this.outputStream);
        } finally {
            safeClose(r);
            this.tempFileManager.clear();
        }
    }

    /**
     * Find byte index separating header from body. It must be the last byte
     * of the first two sequential new lines.
     */
    private int findHeaderEnd(final byte[] buf, int rlen) {
        int splitbyte = 0;
        while (splitbyte + 1 < rlen) {

            // RFC2616
            if (buf[splitbyte] == '\r' && buf[splitbyte + 1] == '\n' && splitbyte + 3 < rlen && buf[splitbyte + 2] == '\r' && buf[splitbyte + 3] == '\n') {
                return splitbyte + 4;
            }

            // tolerance
            if (buf[splitbyte] == '\n' && buf[splitbyte + 1] == '\n') {
                return splitbyte + 2;
            }
            splitbyte++;
        }
        return 0;
    }

    /**
     * Find the byte positions where multipart boundaries start. This reads
     * a large block at a time and uses a temporary buffer to optimize
     * (memory mapped) file access.
     */
    private int[] getBoundaryPositions(ByteBuffer b, byte[] boundary) {
        int[] res = new int[0];
        if (b.remaining() < boundary.length) {
            return res;
        }

        int search_window_pos = 0;
        byte[] search_window = new byte[4 * 1024 + boundary.length];

        int first_fill = (b.remaining() < search_window.length) ? b.remaining() : search_window.length;
        b.get(search_window, 0, first_fill);
        int new_bytes = first_fill - boundary.length;

        do {
            // Search the search_window
            for (int j = 0; j < new_bytes; j++) {
                for (int i = 0; i < boundary.length; i++) {
                    if (search_window[j + i] != boundary[i])
                        break;
                    if (i == boundary.length - 1) {
                        // Match found, add it to results
                        int[] new_res = new int[res.length + 1];
                        System.arraycopy(res, 0, new_res, 0, res.length);
                        new_res[res.length] = search_window_pos + j;
                        res = new_res;
                    }
                }
            }
            search_window_pos += new_bytes;

            // Copy the end of the buffer to the start
            System.arraycopy(search_window, search_window.length - boundary.length, search_window, 0, boundary.length);

            // Refill search_window
            new_bytes = search_window.length - boundary.length;
            new_bytes = (b.remaining() < new_bytes) ? b.remaining() : new_bytes;
            b.get(search_window, boundary.length, new_bytes);
        } while (new_bytes > 0);
        return res;
    }

    @Override
    public CookieHandler getCookies() {
        return this.cookies;
    }

    @Override
    public final Map<String, String> getHeaders() {
        return this.headers;
    }

    @Override
    public final InputStream getInputStream() {
        return this.inputStream;
    }

    @Override
    public final Method getMethod() {
        return this.method;
    }

    /**
     * @deprecated use {@link #getParameters()} instead.
     */
    @Override
    @Deprecated
    public final Map<String, String> getParms() {
        Map<String, String> result = new HashMap<String, String>();
        for (String key : this.parms.keySet()) {
            result.put(key, this.parms.get(key).get(0));
        }

        return result;
    }

    @Override
    public final Map<String, List<String>> getParameters() {
        return this.parms;
    }

    @Override
    public String getQueryParameterString() {
        return this.queryParameterString;
    }

    private RandomAccessFile getTmpBucket() {
        try {
            TempFile tempFile = this.tempFileManager.createTempFile(null);
            return new RandomAccessFile(tempFile.getName(), "rw");
        } catch (Exception e) {
            throw new Error(e); // we won't recover, so throw an error
        }
    }

    @Override
    public final String getUri() {
        return this.uri;
    }

    /**
     * Deduce body length in bytes. Either from "content-length" header or
     * read bytes.
     */
    public long getBodySize() {
        if (this.headers.containsKey("content-length")) {
            return Long.parseLong(this.headers.get("content-length"));
        } else if (this.splitbyte < this.rlen) {
            return this.rlen - this.splitbyte;
        }
        return 0;
    }

    @Override
    public void parseBody(Map<String, String> files) throws IOException, ResponseException {
        RandomAccessFile randomAccessFile = null;
        try {
            long size = getBodySize();
            ByteArrayOutputStream baos = null;
            DataOutput requestDataOutput = null;

            // Store the request in memory or a file, depending on size
            if (size < MEMORY_STORE_LIMIT) {
                baos = new ByteArrayOutputStream();
                requestDataOutput = new DataOutputStream(baos);
            } else {
                randomAccessFile = getTmpBucket();
                requestDataOutput = randomAccessFile;
            }

            // Read all the body and write it to request_data_output
            byte[] buf = new byte[REQUEST_BUFFER_LEN];
            while (this.rlen >= 0 && size > 0) {
                this.rlen = this.inputStream.read(buf, 0, (int) Math.min(size, REQUEST_BUFFER_LEN));
                size -= this.rlen;
                if (this.rlen > 0) {
                    requestDataOutput.write(buf, 0, this.rlen);
                }
            }

            ByteBuffer fbuf = null;
            if (baos != null) {
                fbuf = ByteBuffer.wrap(baos.toByteArray(), 0, baos.size());
            } else {
                fbuf = randomAccessFile.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length());
                randomAccessFile.seek(0);
            }

            // If the method is POST, there may be parameters
            // in data section, too, read it:
            if (Method.POST.equals(this.method)) {
                ContentType contentType = new ContentType(this.headers.get("content-type"));
                if (contentType.isMultipart()) {
                    String boundary = contentType.getBoundary();
                    if (boundary == null) {
                        throw new ResponseException(Status.BAD_REQUEST,
                                "BAD REQUEST: Content type is multipart/form-data but boundary missing. Usage: GET /example/file.html");
                    }
                    decodeMultipartFormData(contentType, fbuf, this.parms, files);
                } else {
                    byte[] postBytes = new byte[fbuf.remaining()];
                    fbuf.get(postBytes);
                    String postLine = new String(postBytes, contentType.getEncoding()).trim();
                    // Handle application/x-www-form-urlencoded
                    if ("application/x-www-form-urlencoded".equalsIgnoreCase(contentType.getContentType())) {
                        decodeParms(postLine, this.parms);
                    } else if (postLine.length() != 0) {
                        // Special case for raw POST data => create a
                        // special files entry "postData" with raw content
                        // data
                        files.put("postData", postLine);
                    }
                }
            } else if (Method.PUT.equals(this.method)) {
                files.put("content", saveTmpFile(fbuf, 0, fbuf.limit(), null));
            }
        } finally {
            safeClose(randomAccessFile);
        }
    }

    /**
     * Retrieves the content of a sent file and saves it to a temporary
     * file. The full path to the saved file is returned.
     */
    private String saveTmpFile(ByteBuffer b, int offset, int len, String filename_hint) {
        String path = "";
        if (len > 0) {
            FileOutputStream fileOutputStream = null;
            try {
                TempFile tempFile = this.tempFileManager.createTempFile(filename_hint);
                ByteBuffer src = b.duplicate();
                fileOutputStream = new FileOutputStream(tempFile.getName());
                FileChannel dest = fileOutputStream.getChannel();
                src.position(offset).limit(offset + len);
                dest.write(src.slice());
                path = tempFile.getName();
            } catch (Exception e) { // Catch exception if any
                throw new Error(e); // we won't recover, so throw an error
            } finally {
                safeClose(fileOutputStream);
            }
        }
        return path;
    }

    @Override
    public String getRemoteIpAddress() {
        return this.remoteIp;
    }

    @Override
    public String getRemoteHostName() {
        return this.remoteHostname;
    }
}

/**
 * Handles one session, i.e. parses the HTTP request and returns the
 * response.
 */
public interface IHTTPSession {

    void execute() throws IOException;

    CookieHandler getCookies();

    Map<String, String> getHeaders();

    InputStream getInputStream();

    Method getMethod();

    /**
     * This method will only return the first value for a given parameter.
     * You will want to use getParameters if you expect multiple values for
     * a given key.
     *
     * @deprecated use {@link #getParameters()} instead.
     */
    @Deprecated
    Map<String, String> getParms();

    Map<String, List<String>> getParameters();

    String getQueryParameterString();

    /**
     * @return the path part of the URL.
     */
    String getUri();

    /**
     * Adds the files in the request body to the files map.
     *
     * @param files
     *            map to modify
     */
    void parseBody(Map<String, String> files) throws IOException, ResponseException;

    /**
     * Get the remote ip address of the requester.
     *
     * @return the IP address.
     */
    String getRemoteIpAddress();

    /**
     * Get the remote hostname of the requester.
     *
     * @return the hostname.
     */
    String getRemoteHostName();
}

/**
 * HTTP Request methods, with the ability to decode a <code>String</code>
 * back to its enum value.
 */
public enum Method {
    GET,
    PUT,
    POST,
    DELETE,
    HEAD,
    OPTIONS,
    TRACE,
    CONNECT,
    PATCH,
    PROPFIND,
    PROPPATCH,
    MKCOL,
    MOVE,
    COPY,
    LOCK,
    UNLOCK;

    static Method lookup(String method) {
        if (method == null)
            return null;

        try {
            return valueOf(method);
        } catch (IllegalArgumentException e) {
            // TODO: Log it?
            return null;
        }
    }
}

/**
 * HTTP response. Return one of these from serve().
 */
public static class Response implements Closeable {

    public interface IStatus {

        String getDescription();

        int getRequestStatus();
    }

    /**
     * Some HTTP response status codes
     */
    public enum Status implements IStatus {
        SWITCH_PROTOCOL(101, "Switching Protocols"),

        OK(200, "OK"),
        CREATED(201, "Created"),
        ACCEPTED(202, "Accepted"),
        NO_CONTENT(204, "No Content"),
        PARTIAL_CONTENT(206, "Partial Content"),
        MULTI_STATUS(207, "Multi-Status"),

        REDIRECT(301, "Moved Permanently"),
        /**
         * Many user agents mishandle 302 in ways that violate the RFC1945
         * spec (i.e., redirect a POST to a GET). 303 and 307 were added in
         * RFC2616 to address this. You should prefer 303 and 307 unless the
         * calling user agent does not support 303 and 307 functionality
         */
        @Deprecated
        FOUND(302, "Found"),
        REDIRECT_SEE_OTHER(303, "See Other"),
        NOT_MODIFIED(304, "Not Modified"),
        TEMPORARY_REDIRECT(307, "Temporary Redirect"),

        BAD_REQUEST(400, "Bad Request"),
        UNAUTHORIZED(401, "Unauthorized"),
        FORBIDDEN(403, "Forbidden"),
        NOT_FOUND(404, "Not Found"),
        METHOD_NOT_ALLOWED(405, "Method Not Allowed"),
        NOT_ACCEPTABLE(406, "Not Acceptable"),
        REQUEST_TIMEOUT(408, "Request Timeout"),
        CONFLICT(409, "Conflict"),
        GONE(410, "Gone"),
        LENGTH_REQUIRED(411, "Length Required"),
        PRECONDITION_FAILED(412, "Precondition Failed"),
        PAYLOAD_TOO_LARGE(413, "Payload Too Large"),
        UNSUPPORTED_MEDIA_TYPE(415, "Unsupported Media Type"),
        RANGE_NOT_SATISFIABLE(416, "Requested Range Not Satisfiable"),
        EXPECTATION_FAILED(417, "Expectation Failed"),
        TOO_MANY_REQUESTS(429, "Too Many Requests"),

        INTERNAL_ERROR(500, "Internal Server Error"),
        NOT_IMPLEMENTED(501, "Not Implemented"),
        SERVICE_UNAVAILABLE(503, "Service Unavailable"),
        UNSUPPORTED_HTTP_VERSION(505, "HTTP Version Not Supported");

        private final int requestStatus;

        private final String description;

        Status(int requestStatus, String description) {
            this.requestStatus = requestStatus;
            this.description = description;
        }

        public static Status lookup(int requestStatus) {
            for (Status status : Status.values()) {
                if (status.getRequestStatus() == requestStatus) {
                    return status;
                }
            }
            return null;
        }

        @Override
        public String getDescription() {
            return "" + this.requestStatus + " " + this.description;
        }

        @Override
        public int getRequestStatus() {
            return this.requestStatus;
        }

    }

    /**
     * Output stream that will automatically send every write to the wrapped
     * OutputStream according to chunked transfer:
     * http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6.1
     */
    private static class ChunkedOutputStream extends FilterOutputStream {

        public ChunkedOutputStream(OutputStream out) {
            super(out);
        }

        @Override
        public void write(int b) throws IOException {
            byte[] data = {
                    (byte) b
            };
            write(data, 0, 1);
        }

        @Override
        public void write(byte[] b) throws IOException {
            write(b, 0, b.length);
        }

        @Override
        public void write(byte[] b, int off, int len) throws IOException {
            if (len == 0)
                return;
            out.write(String.format("%x\r\n", len).getBytes());
            out.write(b, off, len);
            out.write("\r\n".getBytes());
        }

        public void finish() throws IOException {
            out.write("0\r\n\r\n".getBytes());
        }

    }

    /**
     * HTTP status code after processing, e.g. "200 OK", Status.OK
     */
    private IStatus status;

    /**
     * MIME type of content, e.g. "text/html"
     */
    private String mimeType;

    /**
     * Data of the response, may be null.
     */
    private InputStream data;

    private long contentLength;

    /**
     * Headers for the HTTP response. Use addHeader() to add lines. the
     * lowercase map is automatically kept up to date.
     */
    @SuppressWarnings("serial")
    private final Map<String, String> header = new HashMap<String, String>() {

        public String put(String key, String value) {
            lowerCaseHeader.put(key == null ? key : key.toLowerCase(), value);
            return super.put(key, value);
        };
    };

    /**
     * copy of the header map with all the keys lowercase for faster
     * searching.
     */
    private final Map<String, String> lowerCaseHeader = new HashMap<String, String>();

    /**
     * The request method that spawned this response.
     */
    private Method requestMethod;

    /**
     * Use chunkedTransfer
     */
    private boolean chunkedTransfer;

    private boolean encodeAsGzip;

    private boolean keepAlive;

    /**
     * Creates a fixed length response if totalBytes>=0, otherwise chunked.
     */
    public Response(IStatus status, String mimeType, InputStream data, long totalBytes) {
        this.status = status;
        this.mimeType = mimeType;
        if (data == null) {
            this.data = new ByteArrayInputStream(new byte[0]);
            this.contentLength = 0L;
        } else {
            this.data = data;
            this.contentLength = totalBytes;
        }
        this.chunkedTransfer = this.contentLength < 0;
        keepAlive = true;
    }

    @Override
    public void close() throws IOException {
        if (this.data != null) {
            this.data.close();
        }
    }

    /**
     * Adds given line to the header.
     */
    public void addHeader(String name, String value) {
        this.header.put(name, value);
    }

    /**
     * Indicate to close the connection after the Response has been sent.
     *
     * @param close
     *            {@code true} to hint connection closing, {@code false} to
     *            let connection be closed by client.
     */
    public void closeConnection(boolean close) {
        if (close)
            this.header.put("connection", "close");
        else
            this.header.remove("connection");
    }

    /**
     * @return {@code true} if connection is to be closed after this
     *         Response has been sent.
     */
    public boolean isCloseConnection() {
        return "close".equals(getHeader("connection"));
    }

    public InputStream getData() {
        return this.data;
    }

    public String getHeader(String name) {
        return this.lowerCaseHeader.get(name.toLowerCase());
    }

    public String getMimeType() {
        return this.mimeType;
    }

    public Method getRequestMethod() {
        return this.requestMethod;
    }

    public IStatus getStatus() {
        return this.status;
    }

    public void setGzipEncoding(boolean encodeAsGzip) {
        this.encodeAsGzip = encodeAsGzip;
    }

    public void setKeepAlive(boolean useKeepAlive) {
        this.keepAlive = useKeepAlive;
    }

    /**
     * Sends given response to the socket.
     */
    protected void send(OutputStream outputStream) {
        SimpleDateFormat gmtFrmt = new SimpleDateFormat("E, d MMM yyyy HH:mm:ss 'GMT'", Locale.US);
        gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));

        try {
            if (this.status == null) {
                throw new Error("sendResponse(): Status can't be null.");
            }
            PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream, new ContentType(this.mimeType).getEncoding())), false);
            pw.append("HTTP/1.1 ").append(this.status.getDescription()).append(" \r\n");
            if (this.mimeType != null) {
                printHeader(pw, "Content-Type", this.mimeType);
            }
            if (getHeader("date") == null) {
                printHeader(pw, "Date", gmtFrmt.format(new Date()));
            }
            for (Entry<String, String> entry : this.header.entrySet()) {
                printHeader(pw, entry.getKey(), entry.getValue());
            }
            if (getHeader("connection") == null) {
                printHeader(pw, "Connection", (this.keepAlive ? "keep-alive" : "close"));
            }
            if (getHeader("content-length") != null) {
                encodeAsGzip = false;
            }
            if (encodeAsGzip) {
                printHeader(pw, "Content-Encoding", "gzip");
                setChunkedTransfer(true);
            }
            long pending = this.data != null ? this.contentLength : 0;
            if (this.requestMethod != Method.HEAD && this.chunkedTransfer) {
                printHeader(pw, "Transfer-Encoding", "chunked");
            } else if (!encodeAsGzip) {
                pending = sendContentLengthHeaderIfNotAlreadyPresent(pw, pending);
            }
            pw.append("\r\n");
            pw.flush();
            sendBodyWithCorrectTransferAndEncoding(outputStream, pending);
            outputStream.flush();
            safeClose(this.data);
        } catch (IOException ioe) {
            NanoHTTPD.LOG.log(Level.SEVERE, "Could not send response to the client", ioe);
        }
    }

    @SuppressWarnings("static-method")
    protected void printHeader(PrintWriter pw, String key, String value) {
        pw.append(key).append(": ").append(value).append("\r\n");
    }

    protected long sendContentLengthHeaderIfNotAlreadyPresent(PrintWriter pw, long defaultSize) {
        String contentLengthString = getHeader("content-length");
        long size = defaultSize;
        if (contentLengthString != null) {
            try {
                size = Long.parseLong(contentLengthString);
            } catch (NumberFormatException ex) {
                LOG.severe("content-length was no number " + contentLengthString);
            }
        }
        pw.print("Content-Length: " + size + "\r\n");
        return size;
    }

    private void sendBodyWithCorrectTransferAndEncoding(OutputStream outputStream, long pending) throws IOException {
        if (this.requestMethod != Method.HEAD && this.chunkedTransfer) {
            ChunkedOutputStream chunkedOutputStream = new ChunkedOutputStream(outputStream);
            sendBodyWithCorrectEncoding(chunkedOutputStream, -1);
            chunkedOutputStream.finish();
        } else {
            sendBodyWithCorrectEncoding(outputStream, pending);
        }
    }

    private void sendBodyWithCorrectEncoding(OutputStream outputStream, long pending) throws IOException {
        if (encodeAsGzip) {
            GZIPOutputStream gzipOutputStream = new GZIPOutputStream(outputStream);
            sendBody(gzipOutputStream, -1);
            gzipOutputStream.finish();
        } else {
            sendBody(outputStream, pending);
        }
    }

    /**
     * Sends the body to the specified OutputStream. The pending parameter
     * limits the maximum amounts of bytes sent unless it is -1, in which
     * case everything is sent.
     *
     * @param outputStream
     *            the OutputStream to send data to
     * @param pending
     *            -1 to send everything, otherwise sets a max limit to the
     *            number of bytes sent
     * @throws IOException
     *             if something goes wrong while sending the data.
     */
    private void sendBody(OutputStream outputStream, long pending) throws IOException {
        long BUFFER_SIZE = 16 * 1024;
        byte[] buff = new byte[(int) BUFFER_SIZE];
        boolean sendEverything = pending == -1;
        while (pending > 0 || sendEverything) {
            long bytesToRead = sendEverything ? BUFFER_SIZE : Math.min(pending, BUFFER_SIZE);
            int read = this.data.read(buff, 0, (int) bytesToRead);
            if (read <= 0) {
                break;
            }
            outputStream.write(buff, 0, read);
            if (!sendEverything) {
                pending -= read;
            }
        }
    }

    public void setChunkedTransfer(boolean chunkedTransfer) {
        this.chunkedTransfer = chunkedTransfer;
    }

    public void setData(InputStream data) {
        this.data = data;
    }

    public void setMimeType(String mimeType) {
        this.mimeType = mimeType;
    }

    public void setRequestMethod(Method requestMethod) {
        this.requestMethod = requestMethod;
    }

    public void setStatus(IStatus status) {
        this.status = status;
    }
}

public static final class ResponseException extends Exception {

    private static final long serialVersionUID = 6569838532917408380L;

    private final Status status;

    public ResponseException(Status status, String message) {
        super(message);
        this.status = status;
    }

    public ResponseException(Status status, String message, Exception e) {
        super(message, e);
        this.status = status;
    }

    public Status getStatus() {
        return this.status;
    }
}

/**
 * The runnable that will be used for the main listening thread.
 */
public class ServerRunnable implements Runnable {

    private final int timeout;

    private IOException bindException;

    private boolean hasBinded = false;

    public ServerRunnable(int timeout) {
        this.timeout = timeout;
    }

    @Override
    public void run() {
        try {
            myServerSocket.bind(hostname != null ? new InetSocketAddress(hostname, myPort) : new InetSocketAddress(myPort));
            hasBinded = true;
        } catch (IOException e) {
            this.bindException = e;
            return;
        }
        do {
            try {
                final Socket finalAccept = NanoHTTPD.this.myServerSocket.accept();
                if (this.timeout > 0) {
                    finalAccept.setSoTimeout(this.timeout);
                }
                final InputStream inputStream = finalAccept.getInputStream();
                NanoHTTPD.this.asyncRunner.exec(createClientHandler(finalAccept, inputStream));
            } catch (IOException e) {
                NanoHTTPD.LOG.log(Level.FINE, "Communication with the client broken", e);
            }
        } while (!NanoHTTPD.this.myServerSocket.isClosed());
    }
}

/**
 * A temp file.
 * <p/>
 * <p>
 * Temp files are responsible for managing the actual temporary storage and
 * cleaning themselves up when no longer needed.
 * </p>
 */
public interface TempFile {

    public void delete() throws Exception;

    public String getName();

    public OutputStream open() throws Exception;
}

/**
 * Temp file manager.
 * <p/>
 * <p>
 * Temp file managers are created 1-to-1 with incoming requests, to create
 * and cleanup temporary files created as a result of handling the request.
 * </p>
 */
public interface TempFileManager {

    void clear();

    public TempFile createTempFile(String filename_hint) throws Exception;
}

/**
 * Factory to create temp file managers.
 */
public interface TempFileManagerFactory {

    public TempFileManager create();
}

/**
 * Factory to create ServerSocketFactories.
 */
public interface ServerSocketFactory {

    public ServerSocket create() throws IOException;

}

/**
 * Maximum time to wait on Socket.getInputStream().read() (in milliseconds)
 * This is required as the Keep-Alive HTTP connections would otherwise block
 * the socket reading thread forever (or as long the browser is open).
 */
public static final int SOCKET_READ_TIMEOUT = 5000;

/**
 * Common MIME type for dynamic content: plain text
 */
public static final String MIME_PLAINTEXT = "text/plain";

/**
 * Common MIME type for dynamic content: html
 */
public static final String MIME_HTML = "text/html";

/**
 * Pseudo-Parameter to use to store the actual query string in the
 * parameters map for later re-processing.
 */
private static final String QUERY_STRING_PARAMETER = "NanoHttpd.QUERY_STRING";

/**
 * logger to log to.
 */
private static final Logger LOG = Logger.getLogger(NanoHTTPD.class.getName());

/**
 * Hashtable mapping (String)FILENAME_EXTENSION -> (String)MIME_TYPE
 */
protected static Map<String, String> MIME_TYPES;

public static Map<String, String> mimeTypes() {
    if (MIME_TYPES == null) {
        MIME_TYPES = new HashMap<String, String>();
        loadMimeTypes(MIME_TYPES, "META-INF/nanohttpd/default-mimetypes.properties");
        loadMimeTypes(MIME_TYPES, "META-INF/nanohttpd/mimetypes.properties");
        if (MIME_TYPES.isEmpty()) {
            LOG.log(Level.WARNING, "no mime types found in the classpath! please provide mimetypes.properties");
        }
    }
    return MIME_TYPES;
}

@SuppressWarnings({
        "unchecked",
        "rawtypes"
})
private static void loadMimeTypes(Map<String, String> result, String resourceName) {
    try {
        Enumeration<URL> resources = NanoHTTPD.class.getClassLoader().getResources(resourceName);
        while (resources.hasMoreElements()) {
            URL url = (URL) resources.nextElement();
            Properties properties = new Properties();
            InputStream stream = null;
            try {
                stream = url.openStream();
                properties.load(stream);
            } catch (IOException e) {
                LOG.log(Level.SEVERE, "could not load mimetypes from " + url, e);
            } finally {
                safeClose(stream);
            }
            result.putAll((Map) properties);
        }
    } catch (IOException e) {
        LOG.log(Level.INFO, "no mime types available at " + resourceName);
    }
};

/**
 * Creates an SSLSocketFactory for HTTPS. Pass a loaded KeyStore and an
 * array of loaded KeyManagers. These objects must properly
 * loaded/initialized by the caller.
 */
public static SSLServerSocketFactory makeSSLSocketFactory(KeyStore loadedKeyStore, KeyManager[] keyManagers) throws IOException {
    SSLServerSocketFactory res = null;
    try {
        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        trustManagerFactory.init(loadedKeyStore);
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(keyManagers, trustManagerFactory.getTrustManagers(), null);
        res = ctx.getServerSocketFactory();
    } catch (Exception e) {
        throw new IOException(e.getMessage());
    }
    return res;
}

/**
 * Creates an SSLSocketFactory for HTTPS. Pass a loaded KeyStore and a
 * loaded KeyManagerFactory. These objects must properly loaded/initialized
 * by the caller.
 */
public static SSLServerSocketFactory makeSSLSocketFactory(KeyStore loadedKeyStore, KeyManagerFactory loadedKeyFactory) throws IOException {
    try {
        return makeSSLSocketFactory(loadedKeyStore, loadedKeyFactory.getKeyManagers());
    } catch (Exception e) {
        throw new IOException(e.getMessage());
    }
}

/**
 * Creates an SSLSocketFactory for HTTPS. Pass a KeyStore resource with your
 * certificate and passphrase
 */
public static SSLServerSocketFactory makeSSLSocketFactory(String keyAndTrustStoreClasspathPath, char[] passphrase) throws IOException {
    try {
        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
        InputStream keystoreStream = NanoHTTPD.class.getResourceAsStream(keyAndTrustStoreClasspathPath);

        if (keystoreStream == null) {
            throw new IOException("Unable to load keystore from classpath: " + keyAndTrustStoreClasspathPath);
        }

        keystore.load(keystoreStream, passphrase);
        KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        keyManagerFactory.init(keystore, passphrase);
        return makeSSLSocketFactory(keystore, keyManagerFactory);
    } catch (Exception e) {
        throw new IOException(e.getMessage());
    }
}

/**
 * Get MIME type from file name extension, if possible
 *
 * @param uri
 *            the string representing a file
 * @return the connected mime/type
 */
public static String getMimeTypeForFile(String uri) {
    int dot = uri.lastIndexOf('.');
    String mime = null;
    if (dot >= 0) {
        mime = mimeTypes().get(uri.substring(dot + 1).toLowerCase());
    }
    return mime == null ? "application/octet-stream" : mime;
}

private static final void safeClose(Object closeable) {
    try {
        if (closeable != null) {
            if (closeable instanceof Closeable) {
                ((Closeable) closeable).close();
            } else if (closeable instanceof Socket) {
                ((Socket) closeable).close();
            } else if (closeable instanceof ServerSocket) {
                ((ServerSocket) closeable).close();
            } else {
                throw new IllegalArgumentException("Unknown object to close");
            }
        }
    } catch (IOException e) {
        NanoHTTPD.LOG.log(Level.SEVERE, "Could not close", e);
    }
}

private final String hostname;

private final int myPort;

private volatile ServerSocket myServerSocket;

private ServerSocketFactory serverSocketFactory = new DefaultServerSocketFactory();

private Thread myThread;

/**
 * Pluggable strategy for asynchronously executing requests.
 */
protected AsyncRunner asyncRunner;

/**
 * Pluggable strategy for creating and cleaning up temporary files.
 */
private TempFileManagerFactory tempFileManagerFactory;

/**
 * Constructs an HTTP server on given port.
 */
public NanoHTTPD(int port) {
    this(null, port);
}

// -------------------------------------------------------------------------------
// //
//
// Threading Strategy.
//
// -------------------------------------------------------------------------------
// //

/**
 * Constructs an HTTP server on given hostname and port.
 */
public NanoHTTPD(String hostname, int port) {
    this.hostname = hostname;
    this.myPort = port;
    setTempFileManagerFactory(new DefaultTempFileManagerFactory());
    setAsyncRunner(new DefaultAsyncRunner());
}

/**
 * Forcibly closes all connections that are open.
 */
public synchronized void closeAllConnections() {
    stop();
}

/**
 * create a instance of the client handler, subclasses can return a subclass
 * of the ClientHandler.
 *
 * @param finalAccept
 *            the socket the cleint is connected to
 * @param inputStream
 *            the input stream
 * @return the client handler
 */
protected ClientHandler createClientHandler(final Socket finalAccept, final InputStream inputStream) {
    return new ClientHandler(inputStream, finalAccept);
}

/**
 * Instantiate the server runnable, can be overwritten by subclasses to
 * provide a subclass of the ServerRunnable.
 *
 * @param timeout
 *            the socet timeout to use.
 * @return the server runnable.
 */
protected ServerRunnable createServerRunnable(final int timeout) {
    return new ServerRunnable(timeout);
}

/**
 * Decode parameters from a URL, handing the case where a single parameter
 * name might have been supplied several times, by return lists of values.
 * In general these lists will contain a single element.
 *
 * @param parms
 *            original <b>NanoHTTPD</b> parameters values, as passed to the
 *            <code>serve()</code> method.
 * @return a map of <code>String</code> (parameter name) to
 *         <code>List&lt;String&gt;</code> (a list of the values supplied).
 */
protected static Map<String, List<String>> decodeParameters(Map<String, String> parms) {
    return decodeParameters(parms.get(NanoHTTPD.QUERY_STRING_PARAMETER));
}

// -------------------------------------------------------------------------------
// //

/**
 * Decode parameters from a URL, handing the case where a single parameter
 * name might have been supplied several times, by return lists of values.
 * In general these lists will contain a single element.
 *
 * @param queryString
 *            a query string pulled from the URL.
 * @return a map of <code>String</code> (parameter name) to
 *         <code>List&lt;String&gt;</code> (a list of the values supplied).
 */
protected static Map<String, List<String>> decodeParameters(String queryString) {
    Map<String, List<String>> parms = new HashMap<String, List<String>>();
    if (queryString != null) {
        StringTokenizer st = new StringTokenizer(queryString, "&");
        while (st.hasMoreTokens()) {
            String e = st.nextToken();
            int sep = e.indexOf('=');
            String propertyName = sep >= 0 ? decodePercent(e.substring(0, sep)).trim() : decodePercent(e).trim();
            if (!parms.containsKey(propertyName)) {
                parms.put(propertyName, new ArrayList<String>());
            }
            String propertyValue = sep >= 0 ? decodePercent(e.substring(sep + 1)) : null;
            if (propertyValue != null) {
                parms.get(propertyName).add(propertyValue);
            }
        }
    }
    return parms;
}

/**
 * Decode percent encoded <code>String</code> values.
 *
 * @param str
 *            the percent encoded <code>String</code>
 * @return expanded form of the input, for example "foo%20bar" becomes
 *         "foo bar"
 */
protected static String decodePercent(String str) {
    String decoded = null;
    try {
        decoded = URLDecoder.decode(str, "UTF8");
    } catch (UnsupportedEncodingException ignored) {
        NanoHTTPD.LOG.log(Level.WARNING, "Encoding not supported, ignored", ignored);
    }
    return decoded;
}

/**
 * @return true if the gzip compression should be used if the client
 *         accespts it. Default this option is on for text content and off
 *         for everything. Override this for custom semantics.
 */
@SuppressWarnings("static-method")
protected boolean useGzipWhenAccepted(Response r) {
    return r.getMimeType() != null && (r.getMimeType().toLowerCase().contains("text/") || r.getMimeType().toLowerCase().contains("/json"));
}

public final int getListeningPort() {
    return this.myServerSocket == null ? -1 : this.myServerSocket.getLocalPort();
}

public final boolean isAlive() {
    return wasStarted() && !this.myServerSocket.isClosed() && this.myThread.isAlive();
}

public ServerSocketFactory getServerSocketFactory() {
    return serverSocketFactory;
}

public void setServerSocketFactory(ServerSocketFactory serverSocketFactory) {
    this.serverSocketFactory = serverSocketFactory;
}

public String getHostname() {
    return hostname;
}

public TempFileManagerFactory getTempFileManagerFactory() {
    return tempFileManagerFactory;
}

/**
 * Call before start() to serve over HTTPS instead of HTTP
 */
public void makeSecure(SSLServerSocketFactory sslServerSocketFactory, String[] sslProtocols) {
    this.serverSocketFactory = new SecureServerSocketFactory(sslServerSocketFactory, sslProtocols);
}

/**
 * Create a response with unknown length (using HTTP 1.1 chunking).
 */
public static Response newChunkedResponse(IStatus status, String mimeType, InputStream data) {
    return new Response(status, mimeType, data, -1);
}

/**
 * Create a response with known length.
 */
public static Response newFixedLengthResponse(IStatus status, String mimeType, InputStream data, long totalBytes) {
    return new Response(status, mimeType, data, totalBytes);
}

/**
 * Create a text response with known length.
 */
public static Response newFixedLengthResponse(IStatus status, String mimeType, String txt) {
    ContentType contentType = new ContentType(mimeType);
    if (txt == null) {
        return newFixedLengthResponse(status, mimeType, new ByteArrayInputStream(new byte[0]), 0);
    } else {
        byte[] bytes;
        try {
            CharsetEncoder newEncoder = Charset.forName(contentType.getEncoding()).newEncoder();
            if (!newEncoder.canEncode(txt)) {
                contentType = contentType.tryUTF8();
            }
            bytes = txt.getBytes(contentType.getEncoding());
        } catch (UnsupportedEncodingException e) {
            NanoHTTPD.LOG.log(Level.SEVERE, "encoding problem, responding nothing", e);
            bytes = new byte[0];
        }
        return newFixedLengthResponse(status, contentType.getContentTypeHeader(), new ByteArrayInputStream(bytes), bytes.length);
    }
}

/**
 * Create a text response with known length.
 */
public static Response newFixedLengthResponse(String msg) {
    return newFixedLengthResponse(Status.OK, NanoHTTPD.MIME_HTML, msg);
}

/**
 * Override this to customize the server.
 * <p/>
 * <p/>
 * (By default, this returns a 404 "Not Found" plain text error response.)
 *
 * @param session
 *            The HTTP session
 * @return HTTP response, see class Response for details
 */
public Response serve(IHTTPSession session) {
    Map<String, String> files = new HashMap<String, String>();
    Method method = session.getMethod();
    if (Method.PUT.equals(method) || Method.POST.equals(method)) {
        try {
            session.parseBody(files);
        } catch (IOException ioe) {
            return newFixedLengthResponse(Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
        } catch (ResponseException re) {
            return newFixedLengthResponse(re.getStatus(), NanoHTTPD.MIME_PLAINTEXT, re.getMessage());
        }
    }

    Map<String, String> parms = session.getParms();
    parms.put(NanoHTTPD.QUERY_STRING_PARAMETER, session.getQueryParameterString());
    return serve(session.getUri(), method, session.getHeaders(), parms, files);
}

/**
 * Override this to customize the server.
 * <p/>
 * <p/>
 * (By default, this returns a 404 "Not Found" plain text error response.)
 *
 * @param uri
 *            Percent-decoded URI without parameters, for example
 *            "/index.cgi"
 * @param method
 *            "GET", "POST" etc.
 * @param parms
 *            Parsed, percent decoded parameters from URI and, in case of
 *            POST, data.
 * @param headers
 *            Header entries, percent decoded
 * @return HTTP response, see class Response for details
 */
@Deprecated
public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> parms, Map<String, String> files) {
    return newFixedLengthResponse(Status.NOT_FOUND, NanoHTTPD.MIME_PLAINTEXT, "Not Found");
}

/**
 * Pluggable strategy for asynchronously executing requests.
 *
 * @param asyncRunner
 *            new strategy for handling threads.
 */
public void setAsyncRunner(AsyncRunner asyncRunner) {
    this.asyncRunner = asyncRunner;
}

/**
 * Pluggable strategy for creating and cleaning up temporary files.
 *
 * @param tempFileManagerFactory
 *            new strategy for handling temp files.
 */
public void setTempFileManagerFactory(TempFileManagerFactory tempFileManagerFactory) {
    this.tempFileManagerFactory = tempFileManagerFactory;
}

/**
 * Start the server.
 *
 * @throws IOException
 *             if the socket is in use.
 */
public void start() throws IOException {
    start(NanoHTTPD.SOCKET_READ_TIMEOUT);
}

/**
 * Starts the server (in setDaemon(true) mode).
 */
public void start(final int timeout) throws IOException {
    start(timeout, true);
}

/**
 * Start the server.
 *
 * @param timeout
 *            timeout to use for socket connections.
 * @param daemon
 *            start the thread daemon or not.
 * @throws IOException
 *             if the socket is in use.
 */
public void start(final int timeout, boolean daemon) throws IOException {
    this.myServerSocket = this.getServerSocketFactory().create();
    this.myServerSocket.setReuseAddress(true);

    ServerRunnable serverRunnable = createServerRunnable(timeout);
    this.myThread = new Thread(serverRunnable);
    this.myThread.setDaemon(daemon);
    this.myThread.setName("NanoHttpd Main Listener");
    this.myThread.start();
    while (!serverRunnable.hasBinded && serverRunnable.bindException == null) {
        try {
            Thread.sleep(10L);
        } catch (Throwable e) {
            // on android this may not be allowed, that's why we
            // catch throwable the wait should be very short because we are
            // just waiting for the bind of the socket
        }
    }
    if (serverRunnable.bindException != null) {
        throw serverRunnable.bindException;
    }
}

/**
 * Stop the server.
 */
public void stop() {
    try {
        safeClose(this.myServerSocket);
        this.asyncRunner.closeAll();
        if (this.myThread != null) {
            this.myThread.join();
        }
    } catch (Exception e) {
        NanoHTTPD.LOG.log(Level.SEVERE, "Could not stop all connections", e);
    }
}

public final boolean wasStarted() {
    return this.myServerSocket != null && this.myThread != null;
}

}

[rousea]

I'm not sure if you have customized the NanoHTTPD source above, but I will assume not. I ran into this issue when my import statements were reordered. Due to eager evaluation of imports, the statements import fi.iki.elonen.NanoHTTPD.Response.IStatus; import fi.iki.elonen.NanoHTTPD.Response.Status; must come after import java.io.Closeable; Making sure that the IStatus and Status imports are the last imports will let the compiler resolve the symbols.

See https://bugs.openjdk.java.net/browse/JDK-7101822 for more context

[LordFokas]

Oh, so it's a JDK bug, alright.