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