~/tmp »
curl -O https://www.dropbox.com/developers/downloads/sdks/datastore/ios/dropbox-ios-sync-sdk-3.1.1.zip
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 613 0 613 0 0 362 0 --:--:-- 0:00:01 --:--:-- 362
~/tmp » unzip dropbox-ios-sync-sdk-3.1.1.zip
Archive: dropbox-ios-sync-sdk-3.1.1.zip
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of dropbox-ios-sync-sdk-3.1.1.zip or
dropbox-ios-sync-sdk-3.1.1.zip.zip, and cannot find dropbox-ios-sync-sdk-3.1.1.zip.ZIP, period.
~/tmp » cat dropbox-ios-sync-sdk-3.1.1.zip
<!DOCTYPE html>
<html>
<head><title>Dropbox - 404</title>
<link href="https://www.dropbox.com/static/css/error.css" rel="stylesheet" type="text/css">
<link rel="shortcut icon" href="/static/images/favicon.ico"/>
</head>
<body>
<div class="figure">
<img src="/static/images/psychobox.png" alt="Error:"/>
</div>
<div id="errorbox">
<h1>Error (404)</h1>We can't find the page you're looking for. Check out our <a href="https://www.dropbox.com/help">Help Center</a> and <a href="https://forums.dropbox.com">forums</a> for help, or head back to <a href="https://www.dropbox.com/home">home</a>.
</div>
</body>
</html>
E.g. this should fail