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15 <p class="apache">Apache HTTP Server Version 2.0</p>
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17 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
19 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">FAQ</a></div><div id="page-content"><div id="preamble"><h1>Error Messages - Frequently Asked Questions</h1>
21 <p><span>Available Languages: </span><a href="../en/faq/error.html" title="English"> en </a> |
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28 <h2><a name="error" id="error">Error Messages</a></h2>
30 <li><a href="#error.sendfile">Invalid argument:
31 core_output_filter: writing data to the network</a></li>
32 <li><a href="#error.acceptex">AcceptEx failed</a></li>
33 <li><a href="#error.scriptheaders">Premature end of script
37 <h3><a name="error.sendfile" id="error.sendfile">Invalid argument:
38 core_output_filter: writing data to the network</a></h3>
40 <p>Apache uses the <code>sendfile</code> syscall on platforms
41 where it is available in order to speed sending of responses.
42 Unfortunately, on some systems, Apache will detect the presence of
43 <code>sendfile</code> at compile-time, even when it does not work
44 properly. This happens most frequently when using network or
45 other non-standard file-system.</p>
47 <p>Symptoms of this problem include the above message in the error
48 log and zero-length responses to non-zero-sized files. The
49 problem generally occurs only for static files, since dynamic
50 content usually does not make use of <code>sendfile</code>.</p>
52 <p>To fix this problem, simply use the <code class="directive"><a href="../mod/core.html#enablesendfile">EnableSendfile</a></code> directive to disable
53 <code>sendfile</code> for all or part of your server. Also see
54 the <code class="directive"><a href="../mod/core.html#enablemmap">EnableMMAP</a></code>, which can
55 help with similar problems.</p>
59 <h3><a name="error.acceptex" id="error.acceptex">AcceptEx Failed</a></h3>
61 <p>If you get error messages related to the <code>AcceptEx</code> syscall
62 on win32, see the <code class="directive"><a href="../mod/mpm_winnt.html#win32disableacceptex">Win32DisableAcceptEx</a></code>
67 <h3><a name="error.scriptheaders" id="error.scriptheaders">Premature end of script
70 <p>Most problems with CGI scripts result in this message written in the
71 error log together with an <code>Internal Server Error</code> delivered
72 to the browser. A guide to helping debug this type of problem is
73 available in the <a href="../howto/cgi.html#troubleshoot">CGI
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83 <p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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