Websocket stop working on page after OnBeforeBrowse

[rutony]

WinForms + CefSharp 51.0.0

I have page with Websocket. Then I open any link in external browser. Page still worked fine. But websocket stop recieve any information, but have status Ok. What am I doing wrong?

    public class RequestHandler : IRequestHandler {
         bool IRequestHandler.OnBeforeBrowse(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, bool isRedirect)         {
            if (request.Url.ToString().ToLower() != new Uri(ProgramProps.dir_theme + @"\template.html").ToString().ToLower()
              && request.Url.ToString().ToLower() != new Uri("http://localhost:" + ProgramProps.port + @"/themes/" + ProgramProps.currentTheme + @"/template.html").ToString().ToLower()
              && request.Url != @"chrome-devtools://devtools/inspector.html") {
                Process.Start(request.Url.ToString());
                return true;
            } else {
                return false;
            }
         }

        CefReturnValue IRequestHandler.OnBeforeResourceLoad(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback) {               
            return CefReturnValue.Continue;
        }

        bool IRequestHandler.OnOpenUrlFromTab(IWebBrowser browserControl, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture) {
            return false;
        }
        protected virtual bool OnOpenUrlFromTab(IWebBrowser browserControl, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture) {
            return false;
        }
        bool IRequestHandler.OnCertificateError(IWebBrowser browserControl, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback) {
            return false;
        }
        void IRequestHandler.OnPluginCrashed(IWebBrowser browserControl, IBrowser browser, string pluginPath) {
        }

        bool IRequestHandler.GetAuthCredentials(IWebBrowser browserControl, IBrowser browser, IFrame frame, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback) {
            callback.Dispose();
            return false;
        }

        void IRequestHandler.OnRenderProcessTerminated(IWebBrowser browserControl, IBrowser browser, CefTerminationStatus status){
        }

        bool IRequestHandler.OnQuotaRequest(IWebBrowser browserControl, IBrowser browser, string originUrl, long newSize, IRequestCallback callback) {
            return false;
        }

        void IRequestHandler.OnResourceRedirect(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, ref string newUrl) {
        }

        bool IRequestHandler.OnProtocolExecution(IWebBrowser browserControl, IBrowser browser, string url) {
            return url.StartsWith("mailto");
        }

        void IRequestHandler.OnRenderViewReady(IWebBrowser browserControl, IBrowser browser) {
        }

        bool IRequestHandler.OnResourceResponse(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response){
            return false;
        }
        IResponseFilter IRequestHandler.GetResourceResponseFilter(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response) {
            return null;
        }
        void IRequestHandler.OnResourceLoadComplete(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength){}            
    }

[amaitland]

How do I investigate my issue further?

It's important to remember that CefSharp is just a wrapper around the Chromium Embedded Project (CEF), the upstream CEF forum is a valuable resource. Also CEF has it's own Issue Tracker. Please take the time to research your own problem, including Googling, searching on ceforum, etc.

Finding more info

• Have you checked the Debug.log file? (Should be located in your apps executing folder by default)
• Have you googled the error message your seeing? (Don't just google the whole thing, try googling just the keywords and possibly add chromium as a keyword).
• Are you able to reproduce the problem using cefclient? (cefclient is the reference implementation provided by CEF)
• Need more help debugging? Check the Troubleshooting Guide
• Are you using the latest version? Check the Release Branches table to determine if the version your using is supported.

How do I download cefclient?

• Firstly identity which version of CEF your actually using, easiest way is to check your packages.config file, look for the cef.redist.x86 package, it's version will be something like 3.2526.1362, that's the exact version of CEF you'll need to download for comparison. You can also open chrome://version in the browser to determine the version.
• Open http://opensource.spotify.com/cefbuilds/index.html (http://cefbuilds.com for older version) in a web browser
• Locate the exact Branch you require, for the example above the branch is 2526, all the versions follow a similar pattern
• Locate the Windows 32bit or Windows 64bit item, if you don't see the exact version, then click more revisions
• Download Test App
• Are you using WPF/Offscreen or WinForms?

This next part is key

• To compare with WPF/OffScreen run cefclient --multi-threaded-message-loop --off-screen-rendering-enabled
• To compare with WinForms cefclient --multi-threaded-message-loop

[amaitland]

What am I doing wrong?

return true will cancel your request, that maybe causing you a problem. Beyond that you'll have to do your own research, maybe ask on ceforum.

[amaitland]

We'd like to keep issues exclusively for bug reports, so please ask your questions on Gitter

https://github.com/cefsharp/CefSharp/blob/master/ISSUE_TEMPLATE.md

[rutony]

I found that this is due to call onbeforeonload page. Another question is how to prevent onbeforeonload call, when I call OnBeforeBrowse?

[amaitland]

Ask on ceforum