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    <p>It's an internal server error, which return <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1" rel="nofollow noreferrer">status code 500</a> in response. </p> <p>This may be caused by incorrect request, but as well server code or overload may be the reason.<br> If you have access to server, check event logs.</p> <p>See also<br> <a href="http://lists.w3.org/Archives/Public/www-validator/2005Oct/0057" rel="nofollow noreferrer">500 EOF when chunk header expected</a><br> <a href="http://www.perlmonks.org/index.pl?node_id=543006" rel="nofollow noreferrer">Why might LWP::UserAgent be failing with '500 EOF'?</a><br> <a href="http://www.linuxquestions.org/questions/programming-9/500-eof-instead-of-reponse-status-line-in-perl-script-552805/" rel="nofollow noreferrer">500 EOF instead of reponse status line in perl script</a><br> <a href="http://objectmix.com/weblogic/552570-apache-1-3-error-unexpected-eof-reading-http-status-connectionreset.html" rel="nofollow noreferrer">Apache 1.3 error - Unexpected EOF reading HTTP status - connectionreset</a><br> <a href="http://modxcms.com/forums/index.php?topic=28473.0" rel="nofollow noreferrer">Error 500!</a></p> <p><strong>UPDATE</strong> On the other hand, if it's not response message, but a real exception, then it may be simply a bug, <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4191815" rel="nofollow noreferrer">just like in old java</a><br> And workaround may be putting getResponseCode() inside of try/catch and call second time on exception: </p> <pre><code> int responseCode = -1; try { responseCode = con.getResponseCode(); } catch (IOException ex1) { //check if it's eof, if yes retrieve code again if (-1 != ex1.getMessage().indexOf("EOF")) { try { responseCode = con.getResponseCode(); } catch (IOException ex2) { System.out.println(ex2.getMessage()); // handle exception } } else { System.out.println(ex1.getMessage()); // handle exception } } </code></pre> <p>Talking by connections number limit, read<br> <a href="http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800451/800563/What_Is_-_Maximum_number_of_simultaneous_connections.html?nodeid=1167277&amp;vernum=0" rel="nofollow noreferrer">What Is - Maximum number of simultaneous connections</a><br> <a href="http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800451/800563/How_To_-_Close_connections.html?nodeid=1261294&amp;vernum=0" rel="nofollow noreferrer">How To - Close connections </a></p>
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