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| <title>Error Messages - Frequently Asked Questions - Apache HTTP Server</title> |
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| <p class="apache">Apache HTTP Server Version 2.0</p> |
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| <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 class="retired"><h4>Please note</h4> |
| <p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p> |
| <ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul></div><div id="preamble"><h1>Error Messages - Frequently Asked Questions</h1> |
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| <h2><a name="error" id="error">Error Messages</a></h2> |
| <ul> |
| <li><a href="#error.sendfile">Invalid argument: |
| core_output_filter: writing data to the network</a></li> |
| <li><a href="#error.acceptex">AcceptEx failed</a></li> |
| <li><a href="#error.scriptheaders">Premature end of script |
| headers</a></li> |
| </ul> |
| |
| <h3><a name="error.sendfile" id="error.sendfile">Invalid argument: |
| core_output_filter: writing data to the network</a></h3> |
| |
| <p>Apache uses the <code>sendfile</code> syscall on platforms |
| where it is available in order to speed sending of responses. |
| Unfortunately, on some systems, Apache will detect the presence of |
| <code>sendfile</code> at compile-time, even when it does not work |
| properly. This happens most frequently when using network or |
| other non-standard file-system.</p> |
| |
| <p>Symptoms of this problem include the above message in the error |
| log and zero-length responses to non-zero-sized files. The |
| problem generally occurs only for static files, since dynamic |
| content usually does not make use of <code>sendfile</code>.</p> |
| |
| <p>To fix this problem, simply use the <code class="directive"><a href="../mod/core.html#enablesendfile">EnableSendfile</a></code> directive to disable |
| <code>sendfile</code> for all or part of your server. Also see |
| the <code class="directive"><a href="../mod/core.html#enablemmap">EnableMMAP</a></code>, which can |
| help with similar problems.</p> |
| |
| |
| |
| <h3><a name="error.acceptex" id="error.acceptex">AcceptEx Failed</a></h3> |
| |
| <p>If you get error messages related to the <code>AcceptEx</code> syscall |
| on win32, see the <code class="directive"><a href="../mod/mpm_winnt.html#win32disableacceptex">Win32DisableAcceptEx</a></code> |
| directive.</p> |
| |
| |
| |
| <h3><a name="error.scriptheaders" id="error.scriptheaders">Premature end of script |
| headers</a></h3> |
| |
| <p>Most problems with CGI scripts result in this message written in the |
| error log together with an <code>Internal Server Error</code> delivered |
| to the browser. A guide to helping debug this type of problem is |
| available in the <a href="../howto/cgi.html#troubleshoot">CGI |
| tutorial</a>.</p> |
| |
| |
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