summaryrefslogtreecommitdiffstats
path: root/docs/manual/custom-error.html.en
diff options
context:
space:
mode:
Diffstat (limited to 'docs/manual/custom-error.html.en')
-rw-r--r--docs/manual/custom-error.html.en237
1 files changed, 237 insertions, 0 deletions
diff --git a/docs/manual/custom-error.html.en b/docs/manual/custom-error.html.en
new file mode 100644
index 0000000..fe8e8d7
--- /dev/null
+++ b/docs/manual/custom-error.html.en
@@ -0,0 +1,237 @@
+<?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">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
+<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" />
+<!--
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ -->
+<title>Custom Error Responses - Apache HTTP Server Version 2.4</title>
+<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
+<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
+<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="./style/css/prettify.css" />
+<script src="./style/scripts/prettify.min.js" type="text/javascript">
+</script>
+
+<link href="./images/favicon.ico" rel="shortcut icon" /></head>
+<body id="manual-page"><div id="page-header">
+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="./images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="./images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="./">Version 2.4</a></div><div id="page-content"><div id="preamble"><h1>Custom Error Responses</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="./en/custom-error.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="./es/custom-error.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="./fr/custom-error.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="./ja/custom-error.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="./ko/custom-error.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="./tr/custom-error.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+
+
+ <p>Although the Apache HTTP Server provides generic error responses
+ in the event of 4xx or 5xx HTTP status codes, these responses are
+ rather stark, uninformative, and can be intimidating to site users.
+ You may wish to provide custom error responses which are either
+ friendlier, or in some language other than English, or perhaps which
+ are styled more in line with your site layout.</p>
+
+ <p>Customized error responses can be defined for any HTTP status
+ code designated as an error condition - that is, any 4xx or 5xx
+ status.</p>
+
+ <p>Additionally, a set of values are provided, so
+ that the error document can be customized further based on the
+ values of these variables, using <a href="howto/ssi.html">Server
+ Side Includes</a>. Or, you can have error conditions handled by a
+ cgi program, or other dynamic handler (PHP, mod_perl, etc) which
+ makes use of these variables.</p>
+
+ </div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#configuration">Configuration</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#variables">Available Variables</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#custom">Customizing Error Responses</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#multi-lang">Multi Language Custom Error Documents</a></li>
+</ul><h3>See also</h3><ul class="seealso"><li><a href="#comments_section">Comments</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 name="configuration" id="configuration">Configuration</a></h2>
+
+ <p>Custom error documents are configured using the <code class="directive"><a href="./mod/core.html#errordocument">ErrorDocument</a></code> directive,
+ which may be used in global,
+ virtualhost, or directory context. It may be used in .htaccess files
+ if <code class="directive"><a href="./mod/core.html#allowoverride">AllowOverride</a></code> is set to
+ FileInfo.</p>
+
+ <pre class="prettyprint lang-config">ErrorDocument 500 "Sorry, our script crashed. Oh dear"
+ErrorDocument 500 /cgi-bin/crash-recover
+ErrorDocument 500 http://error.example.com/server_error.html
+ErrorDocument 404 /errors/not_found.html
+ErrorDocument 401 /subscription/how_to_subscribe.html</pre>
+
+
+ <p>The syntax of the <code>ErrorDocument</code> directive is:</p>
+
+ <pre class="prettyprint lang-config">ErrorDocument &lt;3-digit-code&gt; &lt;action&gt;</pre>
+
+
+ <p>where the action will be treated as:</p>
+
+ <ol>
+ <li>A local URL to redirect to (if the action begins with a "/").</li>
+ <li>An external URL to redirect to (if the action is a valid URL).</li>
+ <li>Text to be displayed (if none of the above). The text must be
+ wrapped in quotes (") if it consists of more than one word.</li>
+ </ol>
+
+ <p>When redirecting to a local URL, additional environment variables
+ are set so that the response can be further customized. They are not sent to
+ external URLs.</p>
+
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="variables" id="variables">Available Variables</a></h2>
+
+ <p>Redirecting to another URL can be useful, but only if some
+ information can be passed which can then be used to explain or log
+ the error condition more clearly.</p>
+
+ <p>To achieve this, when the error redirect is sent, additional
+ environment variables will be set, which will be generated from
+ the headers provided to the original request by prepending
+ 'REDIRECT_' onto the original header name. This provides the error
+ document the context of the original request.</p>
+
+ <p>For example, you might receive, in addition to more usual
+ environment variables, the following.</p>
+
+ <div class="example"><p><code>
+ REDIRECT_HTTP_ACCEPT=*/*, image/gif, image/jpeg, image/png<br />
+ REDIRECT_HTTP_USER_AGENT=Mozilla/5.0 Fedora/3.5.8-1.fc12 Firefox/3.5.8<br />
+ REDIRECT_PATH=.:/bin:/usr/local/bin:/sbin<br />
+ REDIRECT_QUERY_STRING=<br />
+ REDIRECT_REMOTE_ADDR=121.345.78.123<br />
+ REDIRECT_REMOTE_HOST=client.example.com<br />
+ REDIRECT_SERVER_NAME=www.example.edu<br />
+ REDIRECT_SERVER_PORT=80<br />
+ REDIRECT_SERVER_SOFTWARE=Apache/2.2.15<br />
+ REDIRECT_URL=/cgi-bin/buggy.pl
+ </code></p></div>
+
+ <p><code>REDIRECT_</code> environment variables are created from
+ the environment variables which existed prior to the
+ redirect. They are renamed with a <code>REDIRECT_</code>
+ prefix, <em>i.e.</em>, <code>HTTP_USER_AGENT</code> becomes
+ <code>REDIRECT_HTTP_USER_AGENT</code>.</p>
+
+ <p><code>REDIRECT_URL</code>, <code>REDIRECT_STATUS</code>, and
+ <code>REDIRECT_QUERY_STRING</code> are guaranteed to be set, and
+ the other headers will be set only if they existed prior to the
+ error condition.</p>
+
+ <p><strong>None</strong> of these will be
+ set if the <code class="directive"><a href="./mod/core.html#errordocument">ErrorDocument</a></code> target is an
+ <em>external</em> redirect (anything starting with a
+ scheme name like <code>http:</code>, even if it refers to the same host
+ as the server).</p>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="custom" id="custom">Customizing Error Responses</a></h2>
+
+ <p>If you point your <code>ErrorDocument</code> to some variety of
+ dynamic handler such as a server-side include document, CGI
+ script, or some variety of other handler, you may wish to use the
+ available custom environment variables to customize this
+ response.</p>
+
+ <p>If the ErrorDocument specifies a local redirect to a CGI
+ script, the script should include a "<code>Status:</code>"
+ header field in its output in order to ensure the propagation
+ all the way back to the client of the error condition that
+ caused it to be invoked. For instance, a Perl ErrorDocument
+ script might include the following:</p>
+
+ <pre class="prettyprint lang-perl">...
+print "Content-type: text/html\n";
+printf "Status: %s Condition Intercepted\n", $ENV{"REDIRECT_STATUS"};
+...</pre>
+
+
+ <p>If the script is dedicated to handling a particular error
+ condition, such as <code>404&nbsp;Not&nbsp;Found</code>, it can
+ use the specific code and error text instead.</p>
+
+ <p>Note that if the response contains <code>Location:</code>
+ header (in order to issue a client-side redirect), the script
+ <em>must</em> emit an appropriate <code>Status:</code> header
+ (such as <code>302&nbsp;Found</code>). Otherwise the
+ <code>Location:</code> header may have no effect.</p>
+
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="multi-lang" id="multi-lang">Multi Language Custom Error Documents</a></h2>
+
+ <p>Provided with your installation of the Apache HTTP Server is a
+ directory of custom error documents translated into 16 different
+ languages. There's also a configuration file in the
+ <code>conf/extra</code> configuration directory that can be included
+ to enable this feature.</p>
+
+ <p>In your server configuration file, you'll see a line such as:</p>
+
+ <pre class="prettyprint lang-config"># Multi-language error messages
+#Include conf/extra/httpd-multilang-errordoc.conf</pre>
+
+
+ <p>Uncommenting this <code>Include</code> line will enable this
+ feature, and provide language-negotiated error messages, based on
+ the language preference set in the client browser.</p>
+
+ <p>Additionally, these documents contain various of the
+ <code>REDIRECT_</code> variables, so that additional information can
+ be provided to the end-user about what happened, and what they can
+ do now.</p>
+
+ <p>These documents can be customized to whatever degree you wish to
+ provide more useful information to users about your site, and what
+ they can expect to find there.</p>
+
+ <p><code class="module"><a href="./mod/mod_include.html">mod_include</a></code> and <code class="module"><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>
+ must be enabled to use this feature.</p>
+
+ </div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="./en/custom-error.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="./es/custom-error.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="./fr/custom-error.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="./ja/custom-error.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="./ko/custom-error.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="./tr/custom-error.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
+<script type="text/javascript"><!--//--><![CDATA[//><!--
+var comments_shortname = 'httpd';
+var comments_identifier = 'http://httpd.apache.org/docs/2.4/custom-error.html';
+(function(w, d) {
+ if (w.location.hostname.toLowerCase() == "httpd.apache.org") {
+ d.write('<div id="comments_thread"><\/div>');
+ var s = d.createElement('script');
+ s.type = 'text/javascript';
+ s.async = true;
+ s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier;
+ (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s);
+ }
+ else {
+ d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>');
+ }
+})(window, document);
+//--><!]]></script></div><div id="footer">
+<p class="apache">Copyright 2019 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>
+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
+if (typeof(prettyPrint) !== 'undefined') {
+ prettyPrint();
+}
+//--><!]]></script>
+</body></html> \ No newline at end of file