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686 lines
41 KiB
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mod_policy - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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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>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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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 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_policy</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_policy.html" title="English"> en </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP protocol compliance enforcement.</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module<EFBFBD>Identifier:</a></th><td>policy_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:</a></th><td>mod_policy.c</td></tr></table>
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<h3>Summary</h3>
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<p>The HTTP protocol recommends that clients should be "liberal in
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what they accept", and servers "strict with what they send". In some
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cases it can be difficult to detect when a server or an application
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has been misconfigured, is serving uncacheable content or is behaving
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suboptimally, as an HTTP client might be compensating for the server.
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These problems can potentially lead to excessive bandwidth
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consumption, or a server outage under load.</p>
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<p>The <code class="module"><a href="../mod/mod_policy.html">mod_policy</a></code> module consists of a set of
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filters that test servers for HTTP protocol compliance. These
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tests allow the server administrator to log violations of, or
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outright reject responses where certain defined conditions exist.</p>
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<p>This could be used as a way to set minimum HTTP protocol compliance
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criteria for a restful application. Alternatively, a reverse proxy or
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cache could be configured to protect itself from misconfigured origin
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servers or unexpectedly uncacheable content, or as a mechanism to
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detect configuration mistakes within the server itself.</p>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#policyconditional">PolicyConditional</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyconditionalurl">PolicyConditionalURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyenvironment">PolicyEnvironment</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyfilter">PolicyFilter</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policykeepalive">PolicyKeepalive</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policykeepaliveurl">PolicyKeepaliveURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policylength">PolicyLength</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policylengthurl">PolicyLengthURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policymaxage">PolicyMaxage</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policymaxageurl">PolicyMaxageURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policynocache">PolicyNocache</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policynocacheurl">PolicyNocacheURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policytype">PolicyType</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policytypeurl">PolicyTypeURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyvalidation">PolicyValidation</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyvalidationurl">PolicyValidationURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyvary">PolicyVary</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyvaryurl">PolicyVaryURL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyversion">PolicyVersion</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#policyversionurl">PolicyVersionURL</a></li>
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||
</ul>
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<h3>Topics</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#actions">Actions</a></li>
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||
<li><img alt="" src="../images/down.gif" /> <a href="#tests">Policy Tests</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#example">Example Configuration</a></li>
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</ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="../filter.html">Filters</a></li>
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<li><a href="../compliance.html">HTTP Protocol Compliance</a></li>
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||
</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="actions" id="actions">Actions</a></h2>
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<p>If a policy is violated, one of the following actions can be
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taken:</p>
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<dl>
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<dt><strong>ignore</strong></dt>
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<dd>The policy check will be ignored for the given URL space, even
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if the filter is present.</dd>
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<dt><strong>log</strong></dt>
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<dd>The policy check will be executed, and if a violation is detected
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a warning will be logged to the server error_log, and a
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<code>Warning</code> header added to the response for the benefit of
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the client.</dd>
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<dt><strong>enforce</strong></dt>
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<dd>The policy check will be executed, and if a violation is detected
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an error will be logged to the server error_log, a
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<code>Warning</code> header added to the response, and a <code>502
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Bad Gateway</code> will be returned to the client. Optional links to
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explanatory documentation can be added to each error message,
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detailing the origin of each policy.</dd>
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</dl>
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<p>It is also possible to selectively disable all policies for a
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given URL space, should the need arise, using the
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<code class="directive"><a href="#policyfilter">PolicyFilter</a></code> directive.</p>
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<p>Alternatively, the
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<code class="directive"><a href="#policyenvironment">PolicyEnvironment</a></code>
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directive can be used to specify an environment variable, which if
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present, will cause the policies to be selectively downgraded or
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bypassed.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="tests" id="tests">Policy Tests</a></h2>
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<p>The following policy filters are available:</p>
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<dl>
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<dt><strong><a href="../compliance.html#policytype">POLICY_TYPE</a>
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</strong>: Enforce valid content types</dt>
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<dd>Content types that are syntactically invalid or blank can be detected
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and the request rejected. Types can be restricted to a specific list
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containing optional wildcards ? and *.</dd>
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<dt><strong><a href="../compliance.html#policylength">POLICY_LENGTH</a>
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</strong>: Enforce the presence of a Content-Length</dt>
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<dd>The length of responses can be specified in one of three ways, by
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specifying an explicit length in advance, using chunked encoding to set
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the length, or by setting no length at all and terminating the request
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when complete. The absence of a specific content length can affect the
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cacheability of the response, and prevents the use of keepalive during
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HTTP/1.0 requests. This policy enforces the presence of an explicit
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content length on the response.</dd>
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<dt><strong><a href="../compliance.html#policykeepalive">POLICY_KEEPALIVE
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</a></strong>: Enforce the option to keepalive</dt>
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<dd>Less restrictive than the POLICY_LENGTH test, this policy enforces the
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possibility that the response can be kept alive. If the response doesn't
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have a protocol defined zero length, and the response isn't already an
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error, and the response has neither a Content-Length or is declared
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HTTP/1.1 and lacks Content-Encoding: chunked, then this response will be
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rejected.</dd>
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<dt><strong><a href="../compliance.html#policyvary">POLICY_VARY</a>
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</strong>: Enforce the absence of certain headers within Vary headers</dt>
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<dd>If the Vary header contains any of the headers specified, this policy
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will reject the request. The typical case is the presence of the User-Agent
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within Vary, which is likely to cause a denial of service condition to a
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cache.</dd>
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<dt><strong><a href="../compliance.html#policyvalidation">
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POLICY_VALIDATION</a></strong>: Enforce the presence of Etag and/or
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Last-Modified</dt>
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<dd>The ability for a cache to determine whether a cached entity can be
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refreshed is dependent on whether a valid Etag and/or Last-Modified header
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is present to revalidate against. The absence of both headers, or the
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invalid syntax of a header will cause this policy to be rejected.</dd>
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<dt><strong><a href="../compliance.html#policyconditional">
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POLICY_CONDITIONAL</a></strong>: Enforce correct operation of conditional
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requests</dt>
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<dd>When conditional headers are present in the request, a server should
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respond with a <code>304 Not Modified</code> or <code>412 Precondition
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Failed</code> response where appropriate. A server may ignore conditional
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headers, and this affects the efficiency of the HTTP caching mechanism.
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This policy rejects requests where a conditional header is present, and
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a 304 or 412 response code was expected, but a 2xx response was seen
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instead.</dd>
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<dt><strong><a href="../compliance.html#policynocache">POLICY_NOCACHE</a>
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</strong>: Enforce cacheable responses</dt>
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<dd>When a response is encountered that declares itself explicitly
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uncacheable, the request is rejected. A response is considered
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uncacheable if it specifies any of the following:
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<ul><li><code>Cache-Control: no-cache</code></li>
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<li><code>Pragma: no-cache</code></li>
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<li><code>Cache-Control: no-store</code></li>
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<li><code>Cache-Control: private</code></li>
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</ul></dd>
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<dt><strong><a href="../compliance.html#policymaxage">POLICY_MAXAGE</a>
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</strong>: Enforce a minimum maxage</dt>
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<dd>When a response is encountered where the freshness lifetime is less
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than the given value, or the freshness lifetime is heuristic, the request
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is rejected. A response is checked in the following order:
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<ul><li>If <code>s-maxage</code> is present but too small; or</li>
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<li>If <code>max-age</code> is present but too small; or</li>
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<li>If <code>Expires</code> is present and invalid; or</li>
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<li><code>Date</code> is present and invalid; or</li>
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<li><code>Expires</code> minus Date is too small; or</li>
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<li>No <code>s-maxage</code>, <code>maxage</code>, or
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<code>Expires</code>/<code>Date</code> declared at all</li>
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</ul></dd>
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<dt><strong><a href="../compliance.html#policyversion">POLICY_VERSION</a>
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</strong>: Enforce a minimum HTTP version within a request</dt>
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<dd>When a request is encountered with an HTTP version number less than
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the required minimum version, the request is rejected. The following
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version numbers are recognised:
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<ul><li><code>HTTP/1.1</code></li>
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<li><code>HTTP/1.0</code></li>
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<li><code>HTTP/0.9</code></li>
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||
</ul></dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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||
<div class="section">
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<h2><a name="example" id="example">Example Configuration</a></h2>
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||
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<p>A typical configuration protecting a server serving static content
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might be as follows:</p>
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<div class="example"><p><code>
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<Location /><br />
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<span class="indent">
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SetOutputFilter POLICY_TYPE;POLICY_LENGTH;POLICY_KEEPALIVE;POLICY_VARY;POLICY_VALIDATION; \<br />
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<span class="indent">
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POLICY_CONDITIONAL;POLICY_NOCACHE;POLICY_MAXAGE;POLICY_VERSION<br />
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</span>
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<br />
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# content type must be present and valid, but can be anything<br />
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PolicyType enforce */*<br />
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<br />
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# reject if no explicitly declared content length<br />
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PolicyLength enforce<br />
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<br />
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# covered by the policy length filter<br />
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PolicyKeepalive ignore<br />
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<br />
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# reject if User-Agent appears within Vary headers<br />
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PolicyVary enforce User-Agent<br />
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<br />
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# we want to enforce validation<br />
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PolicyValidation enforce<br />
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<br />
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# non-functional conditional responses should be rejected<br />
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PolicyConditional enforce<br />
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<br />
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# no-cache responses should be rejected<br />
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PolicyNocache enforce<br />
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<br />
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# maxage must be at least a day<br />
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PolicyMaxage enforce 86400<br />
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<br />
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# request version can be anything<br />
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PolicyVersion ignore HTTP/1.1<br />
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</span>
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</Location><br />
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<br />
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# suppress policy protection for server-status<br />
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<Location /server-status><br />
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<span class="indent">
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PolicyFilter off<br />
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</span>
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</Location><br />
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</code></p></div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="PolicyConditional" id="PolicyConditional">PolicyConditional</a> <a name="policyconditional" id="policyconditional">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the conditional request policy.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyConditional <var>ignore|log|enforce</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyConditional is only available in Apache 2.5.0 and
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later.</td></tr>
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||
</table>
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<p>When logged or enforced, a response that should have been conditional
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but wasn't will be rejected.</p>
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||
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<div class="example"><h3>Example</h3><p><code>
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# non-functional conditional responses should be rejected<br />
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PolicyConditional enforce<br />
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||
</code></p></div>
|
||
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||
</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyConditionalURL" id="PolicyConditionalURL">PolicyConditionalURL</a> <a name="policyconditionalurl" id="policyconditionalurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the conditional request policy.</td></tr>
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||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyConditionalURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
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||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyConditionalURL is only available in Apache 2.5.0 and
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||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the conditional
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||
request policy, to appear within error messages.</p>
|
||
|
||
</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyEnvironment" id="PolicyEnvironment">PolicyEnvironment</a> <a name="policyenvironment" id="policyenvironment">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Override policies based on an environment variable.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyEnvironment <var>variable</var> <var>log-value</var> <var>ignore-value</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyEnvironment is only available in Apache 2.5.0 and
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||
later.</td></tr>
|
||
</table>
|
||
<p>Downgrade policies to logging only or ignored based on the presence
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||
of an environment variable. If the given variable is present and equal
|
||
to the log-value, enforced policies will be logged instead. If the given
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||
variable is present and equal to the ignore-value, all policies will
|
||
be ignored.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# downgrade if POLICY_CONTROL was present<br />
|
||
PolicyEnvironment POLICY_CONTROL log ignore<br />
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyFilter" id="PolicyFilter">PolicyFilter</a> <a name="policyfilter" id="policyfilter">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable or disable policies for the given URL space.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyFilter <var>on|off</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>on</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyFilter is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Master switch to enable or disable policies for a given URL space.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# enabled by default<br />
|
||
<Location /><br />
|
||
<span class="indent">
|
||
PolicyFilter on<br />
|
||
</span>
|
||
</Location><br />
|
||
<br />
|
||
# suppress policy protection for server-status<br />
|
||
<Location /server-status><br />
|
||
<span class="indent">
|
||
PolicyFilter off<br />
|
||
</span>
|
||
</Location><br />
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyKeepalive" id="PolicyKeepalive">PolicyKeepalive</a> <a name="policykeepalive" id="policykeepalive">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the keepalive policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyKeepalive <var>ignore|log|enforce</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyKeepalive is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that lacks both an explicit
|
||
<code>Content-Length</code> header and a <code>Transfer-Encoding</code>
|
||
of <code>chunked</code> will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# missing Content-Length or Transfer-Encoding should be rejected<br />
|
||
PolicyKeepalive enforce<br />
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyKeepaliveURL" id="PolicyKeepaliveURL">PolicyKeepaliveURL</a> <a name="policykeepaliveurl" id="policykeepaliveurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the keepalive policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyKeepaliveURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyKeepaliveURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the keepalive
|
||
policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyLength" id="PolicyLength">PolicyLength</a> <a name="policylength" id="policylength">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the content length policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyLength <var>ignore|log|enforce</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyLength is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that lacks an explicit
|
||
<code>Content-Length</code> header will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# missing Content-Length header should be rejected<br />
|
||
PolicyLength enforce<br />
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyLengthURL" id="PolicyLengthURL">PolicyLengthURL</a> <a name="policylengthurl" id="policylengthurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content length policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyLengthURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyLengthURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the content length
|
||
policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyMaxage" id="PolicyMaxage">PolicyMaxage</a> <a name="policymaxage" id="policymaxage">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the caching minimum max-age policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyMaxage <var>ignore|log|enforce</var> <var>age</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyMaxage is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that lacks an explicit freshness
|
||
lifetime defined with <code>max-age</code>, <code>s-maxage</code> or an
|
||
<code>Expires</code> header, or where the explicit freshness lifetime is
|
||
smaller than the given value, will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# reject responses with a freshness lifetime shorter than a day<br />
|
||
PolicyMaxage enforce 86400<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyMaxageURL" id="PolicyMaxageURL">PolicyMaxageURL</a> <a name="policymaxageurl" id="policymaxageurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the caching minimum freshness lifetime policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyMaxageURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyMaxageURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the caching minimum
|
||
freshness lifetime policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyNocache" id="PolicyNocache">PolicyNocache</a> <a name="policynocache" id="policynocache">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the caching no-cache policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyNocache <var>ignore|log|enforce</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyNocache is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that defines itself uncacheable
|
||
using the <code>Cache-Control</code> or <code>Pragma</code> headers will
|
||
be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# Cache-Control: no-cache will be rejected<br />
|
||
PolicyNocache enforce<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyNocacheURL" id="PolicyNocacheURL">PolicyNocacheURL</a> <a name="policynocacheurl" id="policynocacheurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the caching no-cache policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyNocacheURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyNocacheURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the caching no-cache
|
||
policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyType" id="PolicyType">PolicyType</a> <a name="policytype" id="policytype">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the content type policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyType <var>ignore|log|enforce</var> <var>type</var> [ <var>type</var> [ ... ]]</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyType is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that lacks a <code>Content-Type</code>
|
||
header, where the <code>Content-Type</code> header is malformed, or where the
|
||
header does not match the given pattern or patterns will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# enforce json or XML<br />
|
||
PolicyType enforce application/json text/xml<br />
|
||
</code></p></div>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# malformed content type should be rejected<br />
|
||
PolicyType enforce */*<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyTypeURL" id="PolicyTypeURL">PolicyTypeURL</a> <a name="policytypeurl" id="policytypeurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyTypeURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyTypeURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the content type
|
||
policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyValidation" id="PolicyValidation">PolicyValidation</a> <a name="policyvalidation" id="policyvalidation">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the validation policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyValidation <var>ignore|log|enforce</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyValidation is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that lacks either a valid
|
||
<code>ETag</code> header or a <code>Last-Modified</code> header, or where
|
||
either header is syntactically incorrect, will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# no ETag or Last-Modified will be rejected<br />
|
||
PolicyValidation enforce<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyValidationURL" id="PolicyValidationURL">PolicyValidationURL</a> <a name="policyvalidationurl" id="policyvalidationurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyValidationURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyValidationURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the validation policy, to
|
||
appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyVary" id="PolicyVary">PolicyVary</a> <a name="policyvary" id="policyvary">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the Vary policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVary <var>ignore|log|enforce</var> <var>header</var> [ <var>header</var> [ ... ]]</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVary is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a response that contains a <code>Vary</code>
|
||
header which in turn contains one of the headers listed, will be
|
||
rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# reject reponses with "User-Agent" listed in the Vary header<br />
|
||
PolicyVary enforce User-Agent<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyVaryURL" id="PolicyVaryURL">PolicyVaryURL</a> <a name="policyvaryurl" id="policyvaryurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVaryURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVaryURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the vary policy, to
|
||
appear within error messages.</p>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyVersion" id="PolicyVersion">PolicyVersion</a> <a name="policyversion" id="policyversion">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the version policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVersion <var>ignore|log|enforce</var> <var>HTTP/0.9|HTTP/1.0|HTTP/1.1</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVersion is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>When logged or enforced, a request with a version lower than specified
|
||
will be rejected.</p>
|
||
|
||
<div class="example"><h3>Example</h3><p><code>
|
||
# reject requests with an HTTP version older than HTTP/1.1<br />
|
||
PolicyVersion enforce HTTP/1.1<br />
|
||
</code></p></div>
|
||
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="PolicyVersionURL" id="PolicyVersionURL">PolicyVersionURL</a> <a name="policyversionurl" id="policyversionurl">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the minimum request HTTP version policy.</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVersionURL <var>url</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
|
||
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVersionURL is only available in Apache 2.5.0 and
|
||
later.</td></tr>
|
||
</table>
|
||
<p>Specify the URL of the documentation describing the minimum request
|
||
HTTP version policy, to appear within error messages.</p>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="bottomlang">
|
||
<p><span>Available Languages: </span><a href="../en/mod/mod_policy.html" title="English"> en </a></p>
|
||
</div><div id="footer">
|
||
<p class="apache">Copyright 2012 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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