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<?xml version="1.0" encoding="ISO-8859-1"?>
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<title>Frequently Asked Questions - Apache HTTP Server</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.2</p>
<img alt="" src="../images/feather.gif" /></div>
<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
<div id="path">
<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 2.2</a> > <a href="./">FAQ</a></div><div id="page-content"><div id="preamble"><h1>Frequently Asked Questions</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/faq/all_in_one.html" title="English"> en </a> |
<a href="../ja/faq/all_in_one.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/faq/all_in_one.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div>
<p>The latest version of this FAQ is always available from the main Apache
web site, at <<a href="http://httpd.apache.org/docs/2.2/faq/">http://httpd.apache.org/docs/2.2/faq/</a>>.</p>
<p>If you don't find the answer to your question in the below
sections, please also consult the <a href="http://httpd.apache.org/docs/misc/FAQ.html">Apache 1.3
FAQ</a> to see if your question is answered there.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#topics">Topics</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#background">Background</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#support">Support</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#error">Error Messages</a></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a id="topics" name="topics">Topics</a></h2>
<dl><dt><a href="#background">Background</a></dt><dd>Background information about the Apache HTTP Server.</dd>
<dt><a href="#support">Support</a></dt><dd>What do I do when I have problems?</dd>
<dt><a href="#error">Error Messages</a></dt><dd>What does this error message mean?</dd>
</dl></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="background" id="background">Background</a></h2>
<ul>
<li><a href="#background.what-is-apache">What is Apache?</a></li>
<li><a href="#background.what-is-httpd">What is the Apache HTTP
Server?</a></li>
<li><a href="#background.tested">How thoroughly tested is
Apache?</a></li>
<li><a href="#background.logo">May I use the Apache logo on my
product or Web site?</a></li>
</ul>
<h3><a name="background.what-is-apache" id="background.what-is-apache">What is Apache?</a></h3>
<p>The Apache Software Foundation (ASF) is a 501(c)3 non-profit
organization providing support for the Apache community of
open-sourced software projects. For more details, please see the <a href="http://www.apache.org/foundation/faq.html">Apache Software
Foundation FAQ</a></p>
<p>The Apache HTTP Server -- sometimes called Apache httpd -- is
a project of the Apache Software foundation aimed at creating a
robust, commercial-grade, featureful, and freely-available
source code implementation of an HTTP (Web) server. For more
information, please see the <a href="http://httpd.apache.org/ABOUT_APACHE.html">About
Apache</a> page.</p>
<h3><a name="background.what-is-httpd" id="background.what-is-httpd">What is the Apache HTTP Server?</a></h3>
<ul>
<li>is a powerful, flexible, HTTP/1.1 compliant web server</li>
<li>implements the latest protocols, including HTTP/1.1 (RFC2616)</li>
<li>is highly configurable and extensible with third-party modules</li>
<li>can be customised by writing 'modules' using the Apache module
API</li>
<li>provides full source code and comes with an
<a href="http://www.apache.org/licenses/LICENSE-2.0">unrestrictive
license</a></li>
<li>runs on Windows 2003/XP/2000/NT/9x, Netware 5.x and above, OS/2,
and most versions of Unix, as well as several other operating
systems</li>
<li>is actively being developed</li>
<li>encourages user feedback through new ideas, bug reports and
patches</li>
</ul>
<h3><a name="background.tested" id="background.tested">How thoroughly tested is Apache?</a></h3>
<p>Apache is run on millions of Internet servers.
It has been tested thoroughly by both developers and users. The Apache
HTTP Server Project maintains rigorous standards before releasing new
versions of our server, and our server runs without a hitch on over
70% of all WWW servers available on the Internet. When bugs do show
up, we release patches and new versions as soon as they are
available.</p>
<h3><a name="background.logo" id="background.logo">May I use the Apache logo on my product or Web site?</a></h3>
<p>You may <em>NOT</em> use any original artwork from the Apache
Software Foundation, nor make or use modified versions of such
artwork, except under the following conditions:</p>
<ul>
<li>You may use the <a href="http://httpd.apache.org/apache_pb.gif">'Powered by Apache'
graphic</a> on a Web site that is being served by the Apache HTTP
server software.</li>
<li>You may use the aforementioned <a href="http://httpd.apache.org/apache_pb.gif">'Powered by Apache'
graphic</a> or the <a href="http://www.apache.org/images/asf_logo.gif">Apache Software
Foundation logo</a> in product description and promotional material
<em>IF and ONLY IF</em> such use can in no way be interpreted as
anything other than an attribution. Using the Apache name and
artwork in a manner that implies endorsement of a product or
service is strictly forbidden.</li>
</ul>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="support" id="support">Support</a></h2>
<ul>
<li><a href="#support.what2do">"Why can't I ...? Why won't ... work?" What
to do in case of problems</a></li>
<li><a href="#support.support">Whom do I contact for support?</a></li>
</ul>
<h3><a name="support.what2do" id="support.what2do">"Why can't I ...? Why won't ... work?" What to do in case of
problems</a></h3>
<p>If you are having trouble with your Apache server software, you should
take the following steps:</p>
<dl>
<dt>Check the ErrorLog!</dt>
<dd>Apache tries to be helpful when it encounters a problem. In many
cases, it will provide some details by writing one or more messages to the
server error log. Sometimes this is enough for you to diagnose & fix
the problem yourself (such as file permissions or the like). The default
location of the error log is
<code>/usr/local/apache2/logs/error_log</code>, but see the <code class="directive"><a href="../mod/core.html#errorlog">ErrorLog</a></code> directive in your config files for the
location on your server.</dd>
<dt>Check the ErrorLog again!</dt>
<dd>Nearly all problems can be solved by reading the error log.</dd>
<dt>Check the <a href="http://httpd.apache.org/docs/2.2/faq/">FAQ</a>!</dt>
<dd>The latest version of the Apache Frequently-Asked Questions list can
always be found at the main Apache web site.</dd>
<dt>Check the Apache bug database</dt>
<dd>Most problems that get reported to The Apache Group are recorded in
the <a href="http://httpd.apache.org/bug_report.html">bug database</a>.
<strong>Please</strong> check the existing reports, open
<strong>and</strong> closed, before adding one. If you find that your
issue has already been reported, please <em>don't</em> add a "me, too"
report. If the original report isn't closed yet, we suggest that you
check it periodically. You might also consider contacting the original
submitter, because there may be an email exchange going on about the
issue that isn't getting recorded in the database.</dd>
<dt><a id="support.what2do.user-support" name="support.what2do.user-support">Ask in a user support forum</a></dt>
<dd><p>Apache has an active community of users who are willing to share
their knowledge. Participating in this community is usually the best and
fastest way to get answers to your questions and problems.</p>
<p><a href="http://httpd.apache.org/userslist.html">Users
mailing list</a></p>
<p><a href="irc://irc.freenode.net/#apache">#apache</a> on
<a href="http://freenode.net">Freenode IRC</a> is also available for
user support issues.</p>
</dd>
<dt>Please use the bug database for bugs!</dt>
<dd><p>If you've gone through those steps above that are appropriate and
have obtained no relief, then please <em>do</em> let the httpd developers
know about the problem by <a href="http://httpd.apache.org/bug_report.html">logging a bug
report</a>.</p>
<p>If your problem involves the server crashing and generating a core
dump, please <a href="http://httpd.apache.org/dev/debugging.html">
include a backtrace</a> (if possible).</p>
</dd>
</dl>
<h3><a name="support.support" id="support.support">Whom do I contact for support?</a></h3>
<p>With millions of users and fewer than sixty volunteer developers,
we cannot provide personal support for Apache. For free support, we
suggest participating in a <a href="#support.what2do.user-support">user forum</a>.</p>
<p>Professional, commercial support for Apache is available from
<a href="http://www.apache.org/info/support.cgi">a number of
companies</a>.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<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>
<li><a href="#error.permissiondenied">Permission denied</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>
<h3><a name="error.permissiondenied" id="error.permissiondenied">Permission denied</a></h3>
<p>A <code>Permission denied</code> error in the
<code>error_log</code>, accompanied by a <code>Forbidden</code>
message to the client usually indicates a problem with your
filesystem permissions, rather than a problem in the Apache HTTP
Server configuration files. Check to make sure that the
<code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> running the child processes
has adequate permission to access the files in question. Also
check that the directory and all parent directories are at least
searchable for that user and group (i.e., <code>chmod
+x</code>).</p>
<p>Recent releases of Fedora Core and other Linux distributions
using SELinux have additional access restrictions beyond those
used by the basic filesystem. Violations of these restrictions
will also result in a <code>Permission denied</code> message. See
the <a href="http://fedora.redhat.com/docs/selinux-faq-fc3/">Fedora
SELinux FAQ</a> and <a href="http://fedora.redhat.com/docs/selinux-apache-fc3/">Apache
SELinux Policy Document</a>.</p>
</div></div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/faq/all_in_one.html" title="English"> en </a> |
<a href="../ja/faq/all_in_one.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/faq/all_in_one.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div><div id="footer">
<p class="apache">Copyright 2006 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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