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  10 <title>mod_policy - Apache HTTP Server Version 2.5</title>
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  25 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.5</a> &gt; <a href="./">Modules</a></div>
  26 <div id="page-content">
  27 <div id="preamble"><h1>Apache Module mod_policy</h1>
  28 <div class="toplang">
  29 <p><span>Available Languages: </span><a href="../en/mod/mod_policy.html" title="English">&nbsp;en&nbsp;</a> |
  30 <a href="../fr/mod/mod_policy.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
  31 </div>
  32 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP protocol compliance enforcement.</td></tr>
  33 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
  34 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>policy_module</td></tr>
  35 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_policy.c</td></tr></table>
  36 <h3>Summary</h3>
  37
  38     <p>The HTTP protocol recommends that clients should be "liberal in
  39     what they accept", and servers "strict with what they send". In some
  40     cases it can be difficult to detect when a server or an application
  41     has been misconfigured, is serving uncacheable content or is behaving
  42     suboptimally, as an HTTP client might be compensating for the server.
  43     These problems can potentially lead to excessive bandwidth
  44     consumption, or a server outage under load.</p>
  45
  46     <p>The <code class="module"><a href="../mod/mod_policy.html">mod_policy</a></code> module consists of a set of
  47     filters that test servers for HTTP protocol compliance. These
  48     tests allow the server administrator to log violations of, or
  49     outright reject responses where certain defined conditions exist.</p>
  50
  51     <p>This could be used as a way to set minimum HTTP protocol compliance
  52     criteria for a restful application. Alternatively, a reverse proxy or
  53     cache could be configured to protect itself from misconfigured origin
  54     servers or unexpectedly uncacheable content, or as a mechanism to
  55     detect configuration mistakes within the server itself.</p>
  56
  57 </div>
  58 <div id="quickview"><h3>Topics</h3>
  59 <ul id="topics">
  60 <li><img alt="" src="../images/down.gif" /> <a href="#actions">Actions</a></li>
  61 <li><img alt="" src="../images/down.gif" /> <a href="#tests">Policy Tests</a></li>
  62 <li><img alt="" src="../images/down.gif" /> <a href="#example">Example Configuration</a></li>
  63 </ul><h3 class="directives">Directives</h3>
  64 <ul id="toc">
  65 <li><img alt="" src="../images/down.gif" /> <a href="#policyconditional">PolicyConditional</a></li>
  66 <li><img alt="" src="../images/down.gif" /> <a href="#policyconditionalurl">PolicyConditionalURL</a></li>
  67 <li><img alt="" src="../images/down.gif" /> <a href="#policyenvironment">PolicyEnvironment</a></li>
  68 <li><img alt="" src="../images/down.gif" /> <a href="#policyfilter">PolicyFilter</a></li>
  69 <li><img alt="" src="../images/down.gif" /> <a href="#policykeepalive">PolicyKeepalive</a></li>
  70 <li><img alt="" src="../images/down.gif" /> <a href="#policykeepaliveurl">PolicyKeepaliveURL</a></li>
  71 <li><img alt="" src="../images/down.gif" /> <a href="#policylength">PolicyLength</a></li>
  72 <li><img alt="" src="../images/down.gif" /> <a href="#policylengthurl">PolicyLengthURL</a></li>
  73 <li><img alt="" src="../images/down.gif" /> <a href="#policymaxage">PolicyMaxage</a></li>
  74 <li><img alt="" src="../images/down.gif" /> <a href="#policymaxageurl">PolicyMaxageURL</a></li>
  75 <li><img alt="" src="../images/down.gif" /> <a href="#policynocache">PolicyNocache</a></li>
  76 <li><img alt="" src="../images/down.gif" /> <a href="#policynocacheurl">PolicyNocacheURL</a></li>
  77 <li><img alt="" src="../images/down.gif" /> <a href="#policytype">PolicyType</a></li>
  78 <li><img alt="" src="../images/down.gif" /> <a href="#policytypeurl">PolicyTypeURL</a></li>
  79 <li><img alt="" src="../images/down.gif" /> <a href="#policyvalidation">PolicyValidation</a></li>
  80 <li><img alt="" src="../images/down.gif" /> <a href="#policyvalidationurl">PolicyValidationURL</a></li>
  81 <li><img alt="" src="../images/down.gif" /> <a href="#policyvary">PolicyVary</a></li>
  82 <li><img alt="" src="../images/down.gif" /> <a href="#policyvaryurl">PolicyVaryURL</a></li>
  83 <li><img alt="" src="../images/down.gif" /> <a href="#policyversion">PolicyVersion</a></li>
  84 <li><img alt="" src="../images/down.gif" /> <a href="#policyversionurl">PolicyVersionURL</a></li>
  85 </ul>
  86 <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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_policy">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_policy">Report a bug</a></li></ul><h3>See also</h3>
  87 <ul class="seealso">
  88 <li><a href="../filter.html">Filters</a></li>
  89 <li><a href="../compliance.html">HTTP Protocol Compliance</a></li>
  90 <li><a href="#comments_section">Comments</a></li></ul></div>
  91 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  92 <div class="section">
  93 <h2><a name="actions" id="actions">Actions</a><a title="Permanent link" href="#actions" class="permalink">&para;</a></h2>
  94
  95
  96     <p>If a policy is violated, one of the following actions can be
  97     taken:</p>
  98
  99     <dl>
 100     <dt><strong>ignore</strong></dt>
 101     <dd>The policy check will be ignored for the given URL space, even
 102     if the filter is present.</dd>
 103
 104     <dt><strong>log</strong></dt>
 105     <dd>The policy check will be executed, and if a violation is detected
 106     a warning will be logged to the server error_log, and a
 107     <code>Warning</code> header added to the response for the benefit of
 108     the client.</dd>
 109
 110     <dt><strong>enforce</strong></dt>
 111     <dd>The policy check will be executed, and if a violation is detected
 112     an error will be logged to the server error_log, a
 113     <code>Warning</code> header added to the response, and a <code>502
 114     Bad Gateway</code> will be returned to the client. Optional links to
 115     explanatory documentation can be added to each error message,
 116     detailing the origin of each policy.</dd>
 117
 118     </dl>
 119
 120     <p>It is also possible to selectively disable all policies for a
 121     given URL space, should the need arise, using the
 122     <code class="directive"><a href="#policyfilter">PolicyFilter</a></code> directive.</p>
 123
 124     <p>Alternatively, the
 125     <code class="directive"><a href="#policyenvironment">PolicyEnvironment</a></code>
 126     directive can be used to specify an environment variable, which if
 127     present, will cause the policies to be selectively downgraded or
 128     bypassed.</p>
 129
 130 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 131 <div class="section">
 132 <h2><a name="tests" id="tests">Policy Tests</a><a title="Permanent link" href="#tests" class="permalink">&para;</a></h2>
 133
 134
 135     <p>The following policy filters are available:</p>
 136
 137     <dl>
 138     <dt><strong><a href="../compliance.html#policytype">POLICY_TYPE</a>
 139     </strong>: Enforce valid content types</dt>
 140     <dd>Content types that are syntactically invalid or blank can be detected
 141         and the request rejected. Types can be restricted to a specific list
 142         containing optional wildcards ? and *.</dd>
 143
 144     <dt><strong><a href="../compliance.html#policylength">POLICY_LENGTH</a>
 145     </strong>: Enforce the presence of a Content-Length</dt>
 146     <dd>The length of responses can be specified in one of three ways, by
 147     specifying an explicit length in advance, using chunked encoding to set
 148     the length, or by setting no length at all and terminating the request
 149     when complete. The absence of a specific content length can affect the
 150     cacheability of the response, and prevents the use of keepalive during
 151     HTTP/1.0 requests. This policy enforces the presence of an explicit
 152     content length on the response.</dd>
 153
 154     <dt><strong><a href="../compliance.html#policykeepalive">POLICY_KEEPALIVE
 155     </a></strong>: Enforce the option to keepalive</dt>
 156     <dd>Less restrictive than the POLICY_LENGTH test, this policy enforces the
 157     possibility that the response can be kept alive. If the response doesn't
 158     have a protocol defined zero length, and the response isn't already an
 159     error, and the response has neither a Content-Length or is declared
 160     HTTP/1.1 and lacks Content-Encoding: chunked, then this response will be
 161     rejected.</dd>
 162
 163     <dt><strong><a href="../compliance.html#policyvary">POLICY_VARY</a>
 164     </strong>: Enforce the absence of certain headers within Vary headers</dt>
 165     <dd>If the Vary header contains any of the headers specified, this policy
 166     will reject the request. The typical case is the presence of the User-Agent
 167     within Vary, which is likely to cause a denial of service condition to a
 168     cache.</dd>
 169
 170     <dt><strong><a href="../compliance.html#policyvalidation">
 171     POLICY_VALIDATION</a></strong>: Enforce the presence of Etag and/or
 172     Last-Modified</dt>
 173     <dd>The ability for a cache to determine whether a cached entity can be
 174     refreshed is dependent on whether a valid Etag and/or Last-Modified header
 175     is present to revalidate against. The absence of both headers, or the
 176     invalid syntax of a header will cause this policy to be rejected.</dd>
 177
 178     <dt><strong><a href="../compliance.html#policyconditional">
 179     POLICY_CONDITIONAL</a></strong>: Enforce correct operation of conditional
 180     requests</dt>
 181     <dd>When conditional headers are present in the request, a server should
 182     respond with a <code>304 Not Modified</code> or <code>412 Precondition
 183     Failed</code> response where appropriate. A server may ignore conditional
 184     headers, and this affects the efficiency of the HTTP caching mechanism.
 185     This policy rejects requests where a conditional header is present, and
 186     a 304 or 412 response code was expected, but a 2xx response was seen
 187     instead.</dd>
 188
 189     <dt><strong><a href="../compliance.html#policynocache">POLICY_NOCACHE</a>
 190     </strong>: Enforce cacheable responses</dt>
 191     <dd>When a response is encountered that declares itself explicitly
 192     uncacheable, the request is rejected. A response is considered
 193     uncacheable if it specifies any of the following:
 194     <ul><li><code>Cache-Control: no-cache</code></li>
 195     <li><code>Pragma: no-cache</code></li>
 196     <li><code>Cache-Control: no-store</code></li>
 197     <li><code>Cache-Control: private</code></li>
 198     </ul></dd>
 199
 200     <dt><strong><a href="../compliance.html#policymaxage">POLICY_MAXAGE</a>
 201     </strong>: Enforce a minimum maxage</dt>
 202     <dd>When a response is encountered where the freshness lifetime is less
 203     than the given value, or the freshness lifetime is heuristic, the request
 204     is rejected. A response is checked in the following order:
 205     <ul><li>If <code>s-maxage</code> is present but too small; or</li>
 206     <li>If <code>max-age</code> is present but too small; or</li>
 207     <li>If <code>Expires</code> is present and invalid; or</li>
 208     <li><code>Date</code> is present and invalid; or</li>
 209     <li><code>Expires</code> minus Date is too small; or</li>
 210     <li>No <code>s-maxage</code>, <code>maxage</code>, or
 211     <code>Expires</code>/<code>Date</code> declared at all</li>
 212     </ul></dd>
 213
 214     <dt><strong><a href="../compliance.html#policyversion">POLICY_VERSION</a>
 215     </strong>: Enforce a minimum HTTP version within a request</dt>
 216     <dd>When a request is encountered with an HTTP version number less than
 217     the required minimum version, the request is rejected. The following
 218     version numbers are recognised:
 219     <ul><li><code>HTTP/1.1</code></li>
 220     <li><code>HTTP/1.0</code></li>
 221     <li><code>HTTP/0.9</code></li>
 222     </ul></dd>
 223
 224     </dl>
 225
 226 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 227 <div class="section">
 228 <h2><a name="example" id="example">Example Configuration</a><a title="Permanent link" href="#example" class="permalink">&para;</a></h2>
 229
 230
 231     <p>A typical configuration protecting a server serving static content
 232     might be as follows:</p>
 233
 234     <pre class="prettyprint lang-config">&lt;Location "/"&gt;
 235   SetOutputFilter POLICY_TYPE;POLICY_LENGTH;POLICY_KEEPALIVE;POLICY_VARY;POLICY_VALIDATION; \
 236     POLICY_CONDITIONAL;POLICY_NOCACHE;POLICY_MAXAGE;POLICY_VERSION
 237
 238   # content type must be present and valid, but can be anything
 239   PolicyType enforce */*
 240
 241   # reject if no explicitly declared content length
 242   PolicyLength enforce
 243
 244   # covered by the policy length filter
 245   PolicyKeepalive ignore
 246
 247   # reject if User-Agent appears within Vary headers
 248   PolicyVary enforce User-Agent
 249
 250   # we want to enforce validation
 251   PolicyValidation enforce
 252
 253   # non-functional conditional responses should be rejected
 254   PolicyConditional enforce
 255
 256   # no-cache responses should be rejected
 257   PolicyNocache enforce
 258
 259   # maxage must be at least a day
 260   PolicyMaxage enforce 86400
 261
 262   # request version can be anything
 263   PolicyVersion ignore HTTP/1.1
 264 &lt;/Location&gt;
 265
 266 # suppress policy protection for server-status
 267 &lt;Location "/server-status"&gt;
 268   PolicyFilter off
 269 &lt;/Location&gt;</pre>
 270
 271
 272 </div>
 273 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 274 <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">&para;</a></h2>
 275 <table class="directive">
 276 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the conditional request policy.</td></tr>
 277 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyConditional <var>ignore|log|enforce</var></code></td></tr>
 278 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 279 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 280 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 281 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 282 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyConditional is only available in Apache 2.5.0 and
 283 later.</td></tr>
 284 </table>
 285     <p>When logged or enforced, a response that should have been conditional
 286     but wasn't will be rejected.</p>
 287
 288     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># non-functional conditional responses should be rejected
 289 PolicyConditional enforce</pre>
 290 </div>
 291
 292 </div>
 293 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 294 <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">&para;</a></h2>
 295 <table class="directive">
 296 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the conditional request policy.</td></tr>
 297 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyConditionalURL <var>url</var></code></td></tr>
 298 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 299 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 300 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 301 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 302 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyConditionalURL is only available in Apache 2.5.0 and
 303 later.</td></tr>
 304 </table>
 305     <p>Specify the URL of the documentation describing the conditional
 306     request policy, to appear within error messages.</p>
 307
 308 </div>
 309 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 310 <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">&para;</a></h2>
 311 <table class="directive">
 312 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Override policies based on an environment variable.</td></tr>
 313 <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>
 314 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 315 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 316 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 317 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 318 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyEnvironment is only available in Apache 2.5.0 and
 319 later.</td></tr>
 320 </table>
 321     <p>Downgrade policies to logging only or ignored based on the presence
 322     of an environment variable. If the given variable is present and equal
 323     to the log-value, enforced policies will be logged instead. If the given
 324     variable is present and equal to the ignore-value, all policies will
 325     be ignored.</p>
 326
 327     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># downgrade if POLICY_CONTROL was present
 328 PolicyEnvironment POLICY_CONTROL log ignore</pre>
 329 </div>
 330
 331 </div>
 332 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 333 <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">&para;</a></h2>
 334 <table class="directive">
 335 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable or disable policies for the given URL space.</td></tr>
 336 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyFilter <var>on|off</var></code></td></tr>
 337 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>on</code></td></tr>
 338 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 339 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 340 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 341 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyFilter is only available in Apache 2.5.0 and
 342 later.</td></tr>
 343 </table>
 344     <p>Master switch to enable or disable policies for a given URL space.</p>
 345
 346     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># enabled by default
 347 &lt;Location "/"&gt;
 348   PolicyFilter on
 349 &lt;/Location&gt;
 350
 351 # suppress policy protection for server-status
 352 &lt;Location "/server-status"&gt;
 353   PolicyFilter off
 354 &lt;/Location&gt;</pre>
 355 </div>
 356
 357 </div>
 358 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 359 <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">&para;</a></h2>
 360 <table class="directive">
 361 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the keepalive policy.</td></tr>
 362 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyKeepalive <var>ignore|log|enforce</var></code></td></tr>
 363 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 364 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 365 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 366 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 367 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyKeepalive is only available in Apache 2.5.0 and
 368 later.</td></tr>
 369 </table>
 370     <p>When logged or enforced, a response that lacks both an explicit
 371     <code>Content-Length</code> header and a <code>Transfer-Encoding</code>
 372     of <code>chunked</code> will be rejected.</p>
 373
 374     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># missing Content-Length or Transfer-Encoding should be rejected
 375 PolicyKeepalive enforce</pre>
 376 </div>
 377
 378 </div>
 379 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 380 <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">&para;</a></h2>
 381 <table class="directive">
 382 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the keepalive policy.</td></tr>
 383 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyKeepaliveURL <var>url</var></code></td></tr>
 384 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 385 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 386 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 387 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 388 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyKeepaliveURL is only available in Apache 2.5.0 and
 389 later.</td></tr>
 390 </table>
 391     <p>Specify the URL of the documentation describing the keepalive
 392     policy, to appear within error messages.</p>
 393
 394 </div>
 395 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 396 <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">&para;</a></h2>
 397 <table class="directive">
 398 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the content length policy.</td></tr>
 399 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyLength <var>ignore|log|enforce</var></code></td></tr>
 400 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 401 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 402 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 403 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 404 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyLength is only available in Apache 2.5.0 and
 405 later.</td></tr>
 406 </table>
 407     <p>When logged or enforced, a response that lacks an explicit
 408     <code>Content-Length</code> header will be rejected.</p>
 409
 410     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># missing Content-Length header should be rejected
 411 PolicyLength enforce</pre>
 412 </div>
 413
 414 </div>
 415 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 416 <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">&para;</a></h2>
 417 <table class="directive">
 418 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content length policy.</td></tr>
 419 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyLengthURL <var>url</var></code></td></tr>
 420 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 421 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 422 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 423 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 424 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyLengthURL is only available in Apache 2.5.0 and
 425 later.</td></tr>
 426 </table>
 427     <p>Specify the URL of the documentation describing the content length
 428     policy, to appear within error messages.</p>
 429
 430 </div>
 431 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 432 <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">&para;</a></h2>
 433 <table class="directive">
 434 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the caching minimum max-age policy.</td></tr>
 435 <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>
 436 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 437 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 438 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 439 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 440 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyMaxage is only available in Apache 2.5.0 and
 441 later.</td></tr>
 442 </table>
 443     <p>When logged or enforced, a response that lacks an explicit freshness
 444     lifetime defined with <code>max-age</code>, <code>s-maxage</code> or an
 445     <code>Expires</code> header, or where the explicit freshness lifetime is
 446     smaller than the given value, will be rejected.</p>
 447
 448     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># reject responses with a freshness lifetime shorter than a day
 449 PolicyMaxage enforce 86400</pre>
 450 </div>
 451
 452
 453 </div>
 454 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 455 <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">&para;</a></h2>
 456 <table class="directive">
 457 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the caching minimum freshness lifetime policy.</td></tr>
 458 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyMaxageURL <var>url</var></code></td></tr>
 459 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 460 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 461 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 462 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 463 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyMaxageURL is only available in Apache 2.5.0 and
 464 later.</td></tr>
 465 </table>
 466     <p>Specify the URL of the documentation describing the caching minimum
 467     freshness lifetime policy, to appear within error messages.</p>
 468
 469 </div>
 470 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 471 <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">&para;</a></h2>
 472 <table class="directive">
 473 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the caching no-cache policy.</td></tr>
 474 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyNocache <var>ignore|log|enforce</var></code></td></tr>
 475 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 476 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 477 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 478 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 479 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyNocache is only available in Apache 2.5.0 and
 480 later.</td></tr>
 481 </table>
 482     <p>When logged or enforced, a response that defines itself uncacheable
 483     using the <code>Cache-Control</code> or <code>Pragma</code> headers will
 484     be rejected.</p>
 485
 486     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># Cache-Control: no-cache will be rejected
 487 PolicyNocache enforce</pre>
 488 </div>
 489
 490
 491 </div>
 492 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 493 <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">&para;</a></h2>
 494 <table class="directive">
 495 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the caching no-cache policy.</td></tr>
 496 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyNocacheURL <var>url</var></code></td></tr>
 497 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 498 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 499 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 500 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 501 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyNocacheURL is only available in Apache 2.5.0 and
 502 later.</td></tr>
 503 </table>
 504     <p>Specify the URL of the documentation describing the caching no-cache
 505     policy, to appear within error messages.</p>
 506
 507 </div>
 508 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 509 <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">&para;</a></h2>
 510 <table class="directive">
 511 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the content type policy.</td></tr>
 512 <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>
 513 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 514 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 515 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 516 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 517 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyType is only available in Apache 2.5.0 and
 518 later.</td></tr>
 519 </table>
 520     <p>When logged or enforced, a response that lacks a <code>Content-Type</code>
 521     header, where the <code>Content-Type</code> header is malformed, or where the
 522     header does not match the given pattern or patterns will be rejected.</p>
 523
 524     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># enforce json or XML
 525 PolicyType enforce application/json text/xml</pre>
 526 </div>
 527
 528     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># malformed content type should be rejected
 529 PolicyType enforce */*</pre>
 530 </div>
 531
 532
 533 </div>
 534 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 535 <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">&para;</a></h2>
 536 <table class="directive">
 537 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
 538 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyTypeURL <var>url</var></code></td></tr>
 539 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 540 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 541 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 542 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 543 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyTypeURL is only available in Apache 2.5.0 and
 544 later.</td></tr>
 545 </table>
 546     <p>Specify the URL of the documentation describing the content type
 547     policy, to appear within error messages.</p>
 548
 549 </div>
 550 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 551 <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">&para;</a></h2>
 552 <table class="directive">
 553 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the validation policy.</td></tr>
 554 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyValidation <var>ignore|log|enforce</var></code></td></tr>
 555 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 556 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 557 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 558 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 559 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyValidation is only available in Apache 2.5.0 and
 560 later.</td></tr>
 561 </table>
 562     <p>When logged or enforced, a response that lacks either a valid
 563     <code>ETag</code> header or a <code>Last-Modified</code> header, or where
 564     either header is syntactically incorrect, will be rejected.</p>
 565
 566     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># no ETag or Last-Modified will be rejected
 567 PolicyValidation enforce</pre>
 568 </div>
 569
 570
 571 </div>
 572 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 573 <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">&para;</a></h2>
 574 <table class="directive">
 575 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
 576 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyValidationURL <var>url</var></code></td></tr>
 577 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 578 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 579 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 580 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 581 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyValidationURL is only available in Apache 2.5.0 and
 582 later.</td></tr>
 583 </table>
 584     <p>Specify the URL of the documentation describing the validation policy, to
 585     appear within error messages.</p>
 586
 587 </div>
 588 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 589 <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">&para;</a></h2>
 590 <table class="directive">
 591 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the Vary policy.</td></tr>
 592 <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>
 593 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 594 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 595 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 596 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 597 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVary is only available in Apache 2.5.0 and
 598 later.</td></tr>
 599 </table>
 600     <p>When logged or enforced, a response that contains a <code>Vary</code>
 601     header which in turn contains one of the headers listed, will be
 602     rejected.</p>
 603
 604     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># reject reponses with "User-Agent" listed in the Vary header
 605 PolicyVary enforce User-Agent</pre>
 606 </div>
 607
 608
 609 </div>
 610 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 611 <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">&para;</a></h2>
 612 <table class="directive">
 613 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the content type policy.</td></tr>
 614 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVaryURL <var>url</var></code></td></tr>
 615 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 616 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 617 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 618 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 619 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVaryURL is only available in Apache 2.5.0 and
 620 later.</td></tr>
 621 </table>
 622     <p>Specify the URL of the documentation describing the vary policy, to
 623     appear within error messages.</p>
 624
 625 </div>
 626 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 627 <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">&para;</a></h2>
 628 <table class="directive">
 629 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the version policy.</td></tr>
 630 <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>
 631 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ignore</code></td></tr>
 632 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 633 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 634 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 635 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVersion is only available in Apache 2.5.0 and
 636 later.</td></tr>
 637 </table>
 638     <p>When logged or enforced, a request with a version lower than specified
 639     will be rejected.</p>
 640
 641     <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># reject requests with an HTTP version older than HTTP/1.1
 642 PolicyVersion enforce HTTP/1.1</pre>
 643 </div>
 644
 645
 646 </div>
 647 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 648 <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">&para;</a></h2>
 649 <table class="directive">
 650 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URL describing the minimum request HTTP version policy.</td></tr>
 651 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PolicyVersionURL <var>url</var></code></td></tr>
 652 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
 653 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
 654 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
 655 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_policy</td></tr>
 656 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>PolicyVersionURL is only available in Apache 2.5.0 and
 657 later.</td></tr>
 658 </table>
 659     <p>Specify the URL of the documentation describing the minimum request
 660     HTTP version policy, to appear within error messages.</p>
 661
 662 </div>
 663 </div>
 664 <div class="bottomlang">
 665 <p><span>Available Languages: </span><a href="../en/mod/mod_policy.html" title="English">&nbsp;en&nbsp;</a> |
 666 <a href="../fr/mod/mod_policy.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
 667 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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