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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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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 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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