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| <div id="preamble"><h1>Apache Module mod_policy</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_policy.html" title="English"> en </a> | |
| <a href="../fr/mod/mod_policy.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> |
| </div> |
| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP protocol compliance enforcement.</td></tr> |
| <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> |
| <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>policy_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_policy.c</td></tr></table> |
| <h3>Summary</h3> |
| |
| <p>The HTTP protocol recommends that clients should be "liberal in |
| what they accept", and servers "strict with what they send". In some |
| cases it can be difficult to detect when a server or an application |
| has been misconfigured, is serving uncacheable content or is behaving |
| suboptimally, as an HTTP client might be compensating for the server. |
| These problems can potentially lead to excessive bandwidth |
| consumption, or a server outage under load.</p> |
| |
| <p>The <code class="module"><a href="../mod/mod_policy.html">mod_policy</a></code> module consists of a set of |
| filters that test servers for HTTP protocol compliance. These |
| tests allow the server administrator to log violations of, or |
| outright reject responses where certain defined conditions exist.</p> |
| |
| <p>This could be used as a way to set minimum HTTP protocol compliance |
| criteria for a restful application. Alternatively, a reverse proxy or |
| cache could be configured to protect itself from misconfigured origin |
| servers or unexpectedly uncacheable content, or as a mechanism to |
| detect configuration mistakes within the server itself.</p> |
| |
| </div> |
| <div id="quickview"><h3>Topics</h3> |
| <ul id="topics"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#actions">Actions</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#tests">Policy Tests</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#example">Example Configuration</a></li> |
| </ul><h3 class="directives">Directives</h3> |
| <ul id="toc"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyconditional">PolicyConditional</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyconditionalurl">PolicyConditionalURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyenvironment">PolicyEnvironment</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyfilter">PolicyFilter</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policykeepalive">PolicyKeepalive</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policykeepaliveurl">PolicyKeepaliveURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policylength">PolicyLength</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policylengthurl">PolicyLengthURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policymaxage">PolicyMaxage</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policymaxageurl">PolicyMaxageURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policynocache">PolicyNocache</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policynocacheurl">PolicyNocacheURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policytype">PolicyType</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policytypeurl">PolicyTypeURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyvalidation">PolicyValidation</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyvalidationurl">PolicyValidationURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyvary">PolicyVary</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyvaryurl">PolicyVaryURL</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyversion">PolicyVersion</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#policyversionurl">PolicyVersionURL</a></li> |
| </ul> |
| <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_policy">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_policy">Report a bug</a></li></ul><h3>See also</h3> |
| <ul class="seealso"> |
| <li><a href="../filter.html">Filters</a></li> |
| <li><a href="../compliance.html">HTTP Protocol Compliance</a></li> |
| <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="actions" id="actions">Actions</a> <a title="Permanent link" href="#actions" class="permalink">¶</a></h2> |
| |
| |
| <p>If a policy is violated, one of the following actions can be |
| taken:</p> |
| |
| <dl> |
| <dt><strong>ignore</strong></dt> |
| <dd>The policy check will be ignored for the given URL space, even |
| if the filter is present.</dd> |
| |
| <dt><strong>log</strong></dt> |
| <dd>The policy check will be executed, and if a violation is detected |
| a warning will be logged to the server error_log, and a |
| <code>Warning</code> header added to the response for the benefit of |
| the client.</dd> |
| |
| <dt><strong>enforce</strong></dt> |
| <dd>The policy check will be executed, and if a violation is detected |
| an error will be logged to the server error_log, a |
| <code>Warning</code> header added to the response, and a <code>502 |
| Bad Gateway</code> will be returned to the client. Optional links to |
| explanatory documentation can be added to each error message, |
| detailing the origin of each policy.</dd> |
| |
| </dl> |
| |
| <p>It is also possible to selectively disable all policies for a |
| given URL space, should the need arise, using the |
| <code class="directive"><a href="#policyfilter">PolicyFilter</a></code> directive.</p> |
| |
| <p>Alternatively, the |
| <code class="directive"><a href="#policyenvironment">PolicyEnvironment</a></code> |
| directive can be used to specify an environment variable, which if |
| present, will cause the policies to be selectively downgraded or |
| bypassed.</p> |
| |
| </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |
| <div class="section"> |
| <h2><a name="tests" id="tests">Policy Tests</a> <a title="Permanent link" href="#tests" class="permalink">¶</a></h2> |
| |
| |
| <p>The following policy filters are available:</p> |
| |
| <dl> |
| <dt><strong><a href="../compliance.html#policytype">POLICY_TYPE</a> |
| </strong>: Enforce valid content types</dt> |
| <dd>Content types that are syntactically invalid or blank can be detected |
| and the request rejected. Types can be restricted to a specific list |
| containing optional wildcards ? and *.</dd> |
| |
| <dt><strong><a href="../compliance.html#policylength">POLICY_LENGTH</a> |
| </strong>: Enforce the presence of a Content-Length</dt> |
| <dd>The length of responses can be specified in one of three ways, by |
| specifying an explicit length in advance, using chunked encoding to set |
| the length, or by setting no length at all and terminating the request |
| when complete. The absence of a specific content length can affect the |
| cacheability of the response, and prevents the use of keepalive during |
| HTTP/1.0 requests. This policy enforces the presence of an explicit |
| content length on the response.</dd> |
| |
| <dt><strong><a href="../compliance.html#policykeepalive">POLICY_KEEPALIVE |
| </a></strong>: Enforce the option to keepalive</dt> |
| <dd>Less restrictive than the POLICY_LENGTH test, this policy enforces the |
| possibility that the response can be kept alive. If the response doesn't |
| have a protocol defined zero length, and the response isn't already an |
| error, and the response has neither a Content-Length or is declared |
| HTTP/1.1 and lacks Content-Encoding: chunked, then this response will be |
| rejected.</dd> |
| |
| <dt><strong><a href="../compliance.html#policyvary">POLICY_VARY</a> |
| </strong>: Enforce the absence of certain headers within Vary headers</dt> |
| <dd>If the Vary header contains any of the headers specified, this policy |
| will reject the request. The typical case is the presence of the User-Agent |
| within Vary, which is likely to cause a denial of service condition to a |
| cache.</dd> |
| |
| <dt><strong><a href="../compliance.html#policyvalidation"> |
| POLICY_VALIDATION</a></strong>: Enforce the presence of Etag and/or |
| Last-Modified</dt> |
| <dd>The ability for a cache to determine whether a cached entity can be |
| refreshed is dependent on whether a valid Etag and/or Last-Modified header |
| is present to revalidate against. The absence of both headers, or the |
| invalid syntax of a header will cause this policy to be rejected.</dd> |
| |
| <dt><strong><a href="../compliance.html#policyconditional"> |
| POLICY_CONDITIONAL</a></strong>: Enforce correct operation of conditional |
| requests</dt> |
| <dd>When conditional headers are present in the request, a server should |
| respond with a <code>304 Not Modified</code> or <code>412 Precondition |
| Failed</code> response where appropriate. A server may ignore conditional |
| headers, and this affects the efficiency of the HTTP caching mechanism. |
| This policy rejects requests where a conditional header is present, and |
| a 304 or 412 response code was expected, but a 2xx response was seen |
| instead.</dd> |
| |
| <dt><strong><a href="../compliance.html#policynocache">POLICY_NOCACHE</a> |
| </strong>: Enforce cacheable responses</dt> |
| <dd>When a response is encountered that declares itself explicitly |
| uncacheable, the request is rejected. A response is considered |
| uncacheable if it specifies any of the following: |
| <ul><li><code>Cache-Control: no-cache</code></li> |
| <li><code>Pragma: no-cache</code></li> |
| <li><code>Cache-Control: no-store</code></li> |
| <li><code>Cache-Control: private</code></li> |
| </ul></dd> |
| |
| <dt><strong><a href="../compliance.html#policymaxage">POLICY_MAXAGE</a> |
| </strong>: Enforce a minimum maxage</dt> |
| <dd>When a response is encountered where the freshness lifetime is less |
| than the given value, or the freshness lifetime is heuristic, the request |
| is rejected. A response is checked in the following order: |
| <ul><li>If <code>s-maxage</code> is present but too small; or</li> |
| <li>If <code>max-age</code> is present but too small; or</li> |
| <li>If <code>Expires</code> is present and invalid; or</li> |
| <li><code>Date</code> is present and invalid; or</li> |
| <li><code>Expires</code> minus Date is too small; or</li> |
| <li>No <code>s-maxage</code>, <code>maxage</code>, or |
| <code>Expires</code>/<code>Date</code> declared at all</li> |
| </ul></dd> |
| |
| <dt><strong><a href="../compliance.html#policyversion">POLICY_VERSION</a> |
| </strong>: Enforce a minimum HTTP version within a request</dt> |
| <dd>When a request is encountered with an HTTP version number less than |
| the required minimum version, the request is rejected. The following |
| version numbers are recognised: |
| <ul><li><code>HTTP/1.1</code></li> |
| <li><code>HTTP/1.0</code></li> |
| <li><code>HTTP/0.9</code></li> |
| </ul></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="example" id="example">Example Configuration</a> <a title="Permanent link" href="#example" class="permalink">¶</a></h2> |
| |
| |
| <p>A typical configuration protecting a server serving static content |
| might be as follows:</p> |
| |
| <pre class="prettyprint lang-config"><Location "/"> |
| SetOutputFilter POLICY_TYPE;POLICY_LENGTH;POLICY_KEEPALIVE;POLICY_VARY;POLICY_VALIDATION; \ |
| POLICY_CONDITIONAL;POLICY_NOCACHE;POLICY_MAXAGE;POLICY_VERSION |
| |
| # content type must be present and valid, but can be anything |
| PolicyType enforce */* |
| |
| # reject if no explicitly declared content length |
| PolicyLength enforce |
| |
| # covered by the policy length filter |
| PolicyKeepalive ignore |
| |
| # reject if User-Agent appears within Vary headers |
| PolicyVary enforce User-Agent |
| |
| # we want to enforce validation |
| PolicyValidation enforce |
| |
| # non-functional conditional responses should be rejected |
| PolicyConditional enforce |
| |
| # no-cache responses should be rejected |
| PolicyNocache enforce |
| |
| # maxage must be at least a day |
| PolicyMaxage enforce 86400 |
| |
| # request version can be anything |
| PolicyVersion ignore HTTP/1.1 |
| </Location> |
| |
| # suppress policy protection for server-status |
| <Location "/server-status"> |
| PolicyFilter off |
| </Location></pre> |
| |
| |
| </div> |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |
| <div class="directive-section"><h2><a name="PolicyConditional" id="PolicyConditional">PolicyConditional</a> <a name="policyconditional" id="policyconditional">Directive</a> <a title="Permanent link" href="#policyconditional" class="permalink">¶</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the conditional request policy.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyConditional <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>PolicyConditional is only available in Apache 2.5.0 and |
| later.</td></tr> |
| </table> |
| <p>When logged or enforced, a response that should have been conditional |
| but wasn't will be rejected.</p> |
| |
| <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># non-functional conditional responses should be rejected |
| PolicyConditional enforce</pre> |
| </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="PolicyConditionalURL" id="PolicyConditionalURL">PolicyConditionalURL</a> <a name="policyconditionalurl" id="policyconditionalurl">Directive</a> <a title="Permanent link" href="#policyconditionalurl" class="permalink">¶</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> |
| <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> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyConditionalURL is only available in Apache 2.5.0 and |
| later.</td></tr> |
| </table> |
| <p>Specify the URL of the documentation describing the conditional |
| request 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="PolicyEnvironment" id="PolicyEnvironment">PolicyEnvironment</a> <a name="policyenvironment" id="policyenvironment">Directive</a> <a title="Permanent link" href="#policyenvironment" class="permalink">¶</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 |
| later.</td></tr> |
| </table> |
| <p>Downgrade policies to logging only or ignored based on the presence |
| 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 |
| variable is present and equal to the ignore-value, all policies will |
| be ignored.</p> |
| |
| <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># downgrade if POLICY_CONTROL was present |
| PolicyEnvironment POLICY_CONTROL log ignore</pre> |
| </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> <a title="Permanent link" href="#policyfilter" class="permalink">¶</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><pre class="prettyprint lang-config"># enabled by default |
| <Location "/"> |
| PolicyFilter on |
| </Location> |
| |
| # suppress policy protection for server-status |
| <Location "/server-status"> |
| PolicyFilter off |
| </Location></pre> |
| </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> <a title="Permanent link" href="#policykeepalive" class="permalink">¶</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><pre class="prettyprint lang-config"># missing Content-Length or Transfer-Encoding should be rejected |
| PolicyKeepalive enforce</pre> |
| </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> <a title="Permanent link" href="#policykeepaliveurl" class="permalink">¶</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> <a title="Permanent link" href="#policylength" class="permalink">¶</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><pre class="prettyprint lang-config"># missing Content-Length header should be rejected |
| PolicyLength enforce</pre> |
| </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> <a title="Permanent link" href="#policylengthurl" class="permalink">¶</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> <a title="Permanent link" href="#policymaxage" class="permalink">¶</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><pre class="prettyprint lang-config"># reject responses with a freshness lifetime shorter than a day |
| PolicyMaxage enforce 86400</pre> |
| </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> <a title="Permanent link" href="#policymaxageurl" class="permalink">¶</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> <a title="Permanent link" href="#policynocache" class="permalink">¶</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><pre class="prettyprint lang-config"># Cache-Control: no-cache will be rejected |
| PolicyNocache enforce</pre> |
| </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> <a title="Permanent link" href="#policynocacheurl" class="permalink">¶</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> <a title="Permanent link" href="#policytype" class="permalink">¶</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><pre class="prettyprint lang-config"># enforce json or XML |
| PolicyType enforce application/json text/xml</pre> |
| </div> |
| |
| <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># malformed content type should be rejected |
| PolicyType enforce */*</pre> |
| </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> <a title="Permanent link" href="#policytypeurl" class="permalink">¶</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> <a title="Permanent link" href="#policyvalidation" class="permalink">¶</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><pre class="prettyprint lang-config"># no ETag or Last-Modified will be rejected |
| PolicyValidation enforce</pre> |
| </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> <a title="Permanent link" href="#policyvalidationurl" class="permalink">¶</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> <a title="Permanent link" href="#policyvary" class="permalink">¶</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><pre class="prettyprint lang-config"># reject reponses with "User-Agent" listed in the Vary header |
| PolicyVary enforce User-Agent</pre> |
| </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> <a title="Permanent link" href="#policyvaryurl" class="permalink">¶</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> <a title="Permanent link" href="#policyversion" class="permalink">¶</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><pre class="prettyprint lang-config"># reject requests with an HTTP version older than HTTP/1.1 |
| PolicyVersion enforce HTTP/1.1</pre> |
| </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> <a title="Permanent link" href="#policyversionurl" class="permalink">¶</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> | |
| <a href="../fr/mod/mod_policy.html" hreflang="fr" rel="alternate" title="Français"> fr </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&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> |
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