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| <div id="preamble"><h1>Apache Module mod_proxy_html</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_html.html" title="English"> en </a> | |
| <a href="../fr/mod/mod_proxy_html.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>Rewrite HTML links in to ensure they are addressable |
| from Clients' networks in a proxy context.</td></tr> |
| <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr> |
| <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_html_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_html.c</td></tr> |
| <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later. Available as a third-party module |
| for earlier 2.x versions</td></tr></table> |
| <h3>Summary</h3> |
| |
| <p>This module provides an output filter to rewrite HTML links in a |
| proxy situation, to ensure that links work for users outside the proxy. |
| It serves the same purpose as Apache's <code class="directive"><a href="../mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code> directive does |
| for HTTP headers, and is an essential component of a reverse proxy.</p> |
| |
| <p>For example, if a company has an application server at |
| <code>appserver.example.com</code> that is only visible from within |
| the company's internal network, and a public webserver |
| <code>www.example.com</code>, they may wish to provide a gateway to the |
| application server at <code>http://www.example.com/appserver/</code>. |
| When the application server links to itself, those links need to be |
| rewritten to work through the gateway. <code class="module"><a href="../mod/mod_proxy_html.html">mod_proxy_html</a></code> serves to rewrite |
| <code><a href="http://appserver.example.com/foo/bar.html">foobar</a></code> to |
| <code><a href="http://www.example.com/appserver/foo/bar.html">foobar</a></code> |
| making it accessible from outside.</p> |
| |
| <p>mod_proxy_html was originally developed at WebÞing, whose |
| extensive <a href="http://apache.webthing.com/mod_proxy_html/">documentation</a> may be useful to users.</p> |
| </div> |
| <div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3> |
| <ul id="toc"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlbufsize">ProxyHTMLBufSize</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlcharsetout">ProxyHTMLCharsetOut</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmldoctype">ProxyHTMLDocType</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlenable">ProxyHTMLEnable</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlevents">ProxyHTMLEvents</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlextended">ProxyHTMLExtended</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlfixups">ProxyHTMLFixups</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlinterp">ProxyHTMLInterp</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmllinks">ProxyHTMLLinks</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlmeta">ProxyHTMLMeta</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlstripcomments">ProxyHTMLStripComments</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#proxyhtmlurlmap">ProxyHTMLURLMap</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_proxy_html">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_html">Report a bug</a></li></ul><h3>See also</h3> |
| <ul class="seealso"> |
| <li><a href="#comments_section">Comments</a></li></ul></div> |
| |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |
| <div class="directive-section"><h2><a name="ProxyHTMLBufSize" id="ProxyHTMLBufSize">ProxyHTMLBufSize</a> <a name="proxyhtmlbufsize" id="proxyhtmlbufsize">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the buffer size increment for buffering inline scripts and |
| stylesheets.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLBufSize <var>bytes</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLBufSize 8192</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>In order to parse non-HTML content (stylesheets and scripts) embedded |
| in HTML documents, <code class="module"><a href="../mod/mod_proxy_html.html">mod_proxy_html</a></code> |
| has to read the entire script or stylesheet into a buffer. This buffer will |
| be expanded as necessary to hold the largest script or stylesheet in a page, |
| in increments of <var>bytes</var> as set by this directive.</p> |
| <p>The default is 8192, and will work well for almost all pages. However, |
| if you know you're proxying pages containing stylesheets and/or |
| scripts bigger than 8K (that is, for a single script or stylesheet, |
| NOT in total), it will be more efficient to set a larger buffer |
| size and avoid the need to resize the buffer dynamically during a request. |
| </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="ProxyHTMLCharsetOut" id="ProxyHTMLCharsetOut">ProxyHTMLCharsetOut</a> <a name="proxyhtmlcharsetout" id="proxyhtmlcharsetout">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify a charset for mod_proxy_html output.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLCharsetOut <var>Charset | *</var></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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>This selects an encoding for mod_proxy_html output. It should not |
| normally be used, as any change from the default <code>UTF-8</code> |
| (Unicode - as used internally by libxml2) will impose an additional |
| processing overhead. The special token <code>ProxyHTMLCharsetOut *</code> |
| will generate output using the same encoding as the input.</p> |
| <p>Note that this relies on <code class="module"><a href="../mod/mod_xml2enc.html">mod_xml2enc</a></code> being loaded.</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="ProxyHTMLDocType" id="ProxyHTMLDocType">ProxyHTMLDocType</a> <a name="proxyhtmldoctype" id="proxyhtmldoctype">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets an HTML or XHTML document type declaration.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLDocType HTML|XHTML [Legacy]<br /><strong>OR</strong> |
| <br />ProxyHTMLDocType <var>fpi</var> [SGML|XML]</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>In the first form, documents will be declared as HTML 4.01 or XHTML 1.0 |
| according to the option selected. This option also determines whether |
| HTML or XHTML syntax is used for output. Note that the format of the |
| documents coming from the backend server is immaterial: the parser will |
| deal with it automatically. If the optional second argument is set to |
| <code>Legacy</code>, documents will be declared "Transitional", an option that may |
| be necessary if you are proxying pre-1998 content or working with defective |
| authoring/publishing tools.</p> |
| <p>In the second form, it will insert your own FPI. The optional second |
| argument determines whether SGML/HTML or XML/XHTML syntax will be used.</p> |
| <p>The default is changed to omitting any FPI, |
| on the grounds that no FPI is better than a bogus one. If your backend |
| generates decent HTML or XHTML, set it accordingly.</p> |
| <p>If the first form is used, mod_proxy_html |
| will also clean up the HTML to the specified standard. It cannot |
| fix every error, but it will strip out bogus elements and attributes. |
| It will also optionally log other errors at <code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> Debug.</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="ProxyHTMLEnable" id="ProxyHTMLEnable">ProxyHTMLEnable</a> <a name="proxyhtmlenable" id="proxyhtmlenable">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Turns the proxy_html filter on or off.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLEnable On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLEnable Off</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| module for earlier 2.x versions.</td></tr> |
| </table> |
| <p>A simple switch to enable or disable the proxy_html filter. |
| If <code class="module"><a href="../mod/mod_xml2enc.html">mod_xml2enc</a></code> is loaded it will also automatically |
| set up internationalisation support.</p> |
| <p>Note that the proxy_html filter will only act on HTML data |
| (Content-Type text/html or application/xhtml+xml) and when the |
| data are proxied. You can override this (at your own risk) by |
| setting the <var>PROXY_HTML_FORCE</var> environment variable.</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="ProxyHTMLEvents" id="ProxyHTMLEvents">ProxyHTMLEvents</a> <a name="proxyhtmlevents" id="proxyhtmlevents">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify attributes to treat as scripting events.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLEvents <var>attribute [attribute ...]</var></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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>Specifies one or more attributes to treat as scripting events and |
| apply <code class="directive"><a href="#proxyhtmlurlmap">ProxyHTMLURLMap</a></code>s to where enabled. |
| You can specify any number of attributes in one or more |
| <code class="directive">ProxyHTMLEvents</code> directives.</p> |
| <p>Normally you'll set this globally. If you set <code class="directive">ProxyHTMLEvents</code> in more than |
| one scope so that one overrides the other, you'll need to specify a complete |
| set in each of those scopes.</p> |
| <p>A default configuration is supplied in <var>proxy-html.conf</var> |
| and defines the events in standard HTML 4 and XHTML 1.</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="ProxyHTMLExtended" id="ProxyHTMLExtended">ProxyHTMLExtended</a> <a name="proxyhtmlextended" id="proxyhtmlextended">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines whether to fix links in inline scripts, stylesheets, |
| and scripting events.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLExtended On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLExtended Off</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>Set to <code>Off</code>, HTML links are rewritten according to the |
| <code class="directive"><a href="#proxyhtmlurlmap">ProxyHTMLURLMap</a></code> directives, but links appearing |
| in Javascript and CSS are ignored.</p> |
| <p>Set to <code>On</code>, all scripting events (as determined by |
| <code class="directive"><a href="#proxyhtmlevents">ProxyHTMLEvents</a></code>) and embedded scripts or |
| stylesheets are also processed by the <code class="directive"><a href="#proxyhtmlurlmap">ProxyHTMLURLMap</a></code> |
| rules, according to the flags set for each rule. Since this requires more |
| parsing, performance will be best if you only enable it when strictly necessary. |
| </p><p> |
| You'll also need to take care over patterns matched, since the parser has no |
| knowledge of what is a URL within an embedded script or stylesheet. |
| In particular, extended matching of <code>/</code> is likely to lead to |
| false matches. |
| </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="ProxyHTMLFixups" id="ProxyHTMLFixups">ProxyHTMLFixups</a> <a name="proxyhtmlfixups" id="proxyhtmlfixups">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fixes for simple HTML errors.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLFixups [lowercase] [dospath] [reset]</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>This directive takes one to three arguments as follows:</p> |
| <ul> |
| <li><code>lowercase</code> Urls are rewritten to lowercase</li> |
| <li><code>dospath</code> Backslashes in URLs are rewritten to forward slashes.</li> |
| <li><code>reset</code> Unset any options set at a higher level in the configuration.</li> |
| </ul> |
| <p>Take care when using these. The fixes will correct certain authoring |
| mistakes, but risk also erroneously fixing links that were correct to start with. |
| Only use them if you know you have a broken backend server.</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="ProxyHTMLInterp" id="ProxyHTMLInterp">ProxyHTMLInterp</a> <a name="proxyhtmlinterp" id="proxyhtmlinterp">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables per-request interpolation of |
| <code class="directive">ProxyHTMLURLMap</code> rules.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLInterp On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLInterp Off</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| module for earlier 2.x versions</td></tr> |
| </table> |
| <p>This enables per-request interpolation in |
| <code class="directive"><a href="#proxyhtmlurlmap">ProxyHTMLURLMap</a></code> to- and from- patterns.</p> |
| <p>If interpolation is not enabled, all rules are pre-compiled at startup. |
| With interpolation, they must be re-compiled for every request, which |
| implies an extra processing overhead. It should therefore be |
| enabled only when necessary.</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="ProxyHTMLLinks" id="ProxyHTMLLinks">ProxyHTMLLinks</a> <a name="proxyhtmllinks" id="proxyhtmllinks">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify HTML elements that have URL attributes to be rewritten.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLLinks <var>element attribute [attribute2 ...]</var></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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>Specifies elements that have URL attributes that should be rewritten |
| using standard <code class="directive"><a href="#proxyhtmlurlmap">ProxyHTMLURLMap</a></code>s. |
| You will need one <code class="directive">ProxyHTMLLinks</code> directive per element, |
| but it can have any number of attributes.</p> |
| <p>Normally you'll set this globally. If you set <code class="directive">ProxyHTMLLinks</code> in more than |
| one scope so that one overrides the other, you'll need to specify a complete |
| set in each of those scopes.</p> |
| <p>A default configuration is supplied in <var>proxy-html.conf</var> |
| and defines the HTML links for standard HTML 4 and XHTML 1.</p> |
| <div class="example"><h3>Examples from proxy-html.conf</h3><pre class="prettyprint lang-config">ProxyHTMLLinks a href |
| ProxyHTMLLinks area href |
| ProxyHTMLLinks link href |
| ProxyHTMLLinks img src longdesc usemap |
| ProxyHTMLLinks object classid codebase data usemap |
| ProxyHTMLLinks q cite |
| ProxyHTMLLinks blockquote cite |
| ProxyHTMLLinks ins cite |
| ProxyHTMLLinks del cite |
| ProxyHTMLLinks form action |
| ProxyHTMLLinks input src usemap |
| ProxyHTMLLinks head profile |
| ProxyHTMLLinks base href |
| ProxyHTMLLinks script src for</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="ProxyHTMLMeta" id="ProxyHTMLMeta">ProxyHTMLMeta</a> <a name="proxyhtmlmeta" id="proxyhtmlmeta">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Turns on or off extra pre-parsing of metadata in HTML |
| <code><head></code> sections.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLMeta On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLMeta Off</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| module for earlier 2.x versions.</td></tr> |
| </table> |
| <p>This turns on or off pre-parsing of metadata in HTML |
| <code><head></code> sections.</p> |
| <p>If not required, turning ProxyHTMLMeta Off will give a small |
| performance boost by skipping this parse step. However, it |
| is sometimes necessary for internationalisation to work correctly.</p> |
| <p><code class="directive">ProxyHTMLMeta</code> has two effects. Firstly and most importantly |
| it enables detection of character encodings declared in the form</p> |
| <pre><meta http-equiv="Content-Type" content="text/html;charset=<var>foo</var>"></pre> |
| <p>or, in the case of an XHTML document, an XML declaration. |
| It is NOT required if the charset is declared in a real HTTP header |
| (which is always preferable) from the backend server, nor if the |
| document is <var>utf-8</var> (unicode) or a subset such as ASCII. |
| You may also be able to dispense with it where documents use a |
| default declared using <code class="directive"><a href="../mod/mod_xml2enc.html#xml2encdefault">xml2EncDefault</a></code>, but that risks propagating an |
| incorrect declaration. A <code class="directive"><a href="#proxyhtmlcharsetout">ProxyHTMLCharsetOut</a></code> |
| can remove that risk, but is likely to be a bigger processing |
| overhead than enabling ProxyHTMLMeta.</p> |
| <p>The other effect of enabling <code class="directive">ProxyHTMLMeta</code> is to parse all |
| <code><meta http-equiv=...></code> declarations and convert |
| them to real HTTP headers, in keeping with the original purpose |
| of this form of the HTML <meta> element.</p> |
| |
| <div class="warning"><h3>Warning</h3> |
| Because ProxyHTMLMeta promotes <strong>all</strong> |
| <code>http-equiv</code> elements to HTTP headers, it is important that you |
| only enable it in cases where you trust the HTML content as much as you |
| trust the upstream server. If the HTML is controlled by bad actors, it |
| will be possible for them to inject arbitrary, possibly malicious, HTTP |
| headers into your server's responses. |
| </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="ProxyHTMLStripComments" id="ProxyHTMLStripComments">ProxyHTMLStripComments</a> <a name="proxyhtmlstripcomments" id="proxyhtmlstripcomments">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines whether to strip HTML comments.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLStripComments On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHTMLStripComments Off</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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| for earlier 2.x versions</td></tr> |
| </table> |
| <p>This directive will cause mod_proxy_html to strip HTML comments. |
| Note that this will also kill off any scripts or styles embedded in |
| comments (a bogosity introduced in 1995/6 with Netscape 2 for the |
| benefit of then-older browsers, but still in use today). |
| It may also interfere with comment-based processors such as SSI or ESI: |
| be sure to run any of those <em>before</em> mod_proxy_html in the |
| filter chain if stripping comments!</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="ProxyHTMLURLMap" id="ProxyHTMLURLMap">ProxyHTMLURLMap</a> <a name="proxyhtmlurlmap" id="proxyhtmlurlmap">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Defines a rule to rewrite HTML links</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHTMLURLMap <var>from-pattern to-pattern [flags] [cond]</var></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>Base</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_html</td></tr> |
| <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.4 and later; available as a third-party |
| module for earlier 2.x versions.</td></tr> |
| </table> |
| <p>This is the key directive for rewriting HTML links. When parsing a document, |
| whenever a link target matches <var>from-pattern</var>, the matching |
| portion will be rewritten to <var>to-pattern</var>, as modified by any |
| flags supplied and by the |
| <code class="directive"><a href="#proxyhtmlextended">ProxyHTMLExtended</a></code> directive. |
| Only the elements specified using |
| the <code class="directive"><a href="#proxyhtmllinks">ProxyHTMLLinks</a></code> directive |
| will be considered as HTML links.</p> |
| |
| <p>The optional third argument may define any of the following |
| <strong>Flags</strong>. Flags are case-sensitive.</p> |
| <dl> |
| <dt>h</dt> |
| <dd><p>Ignore HTML links (pass through unchanged)</p></dd> |
| <dt>e</dt> |
| <dd><p>Ignore scripting events (pass through unchanged)</p></dd> |
| <dt>c</dt> |
| <dd><p>Pass embedded script and style sections through untouched.</p></dd> |
| |
| <dt>L</dt> |
| <dd><p>Last-match. If this rule matches, no more rules are applied |
| (note that this happens automatically for HTML links).</p></dd> |
| <dt>l</dt> |
| <dd><p>Opposite to L. Overrides the one-change-only default |
| behaviour with HTML links.</p></dd> |
| <dt>R</dt> |
| <dd><p>Use Regular Expression matching-and-replace. <code>from-pattern</code> |
| is a regexp, and <code>to-pattern</code> a replacement string that may be |
| based on the regexp. Regexp memory is supported: you can use brackets () |
| in the <code>from-pattern</code> and retrieve the matches with $1 to $9 |
| in the <code>to-pattern</code>.</p> |
| |
| <p>If R is not set, it will use string-literal search-and-replace. |
| The logic is <em>starts-with</em> in HTML links, but |
| <em>contains</em> in scripting events and embedded script and style sections. |
| </p> |
| </dd> |
| <dt>x</dt> |
| <dd><p>Use POSIX extended Regular Expressions. Only applicable with R.</p></dd> |
| <dt>i</dt> |
| <dd><p>Case-insensitive matching. Only applicable with R.</p></dd> |
| |
| <dt>n</dt> |
| <dd><p>Disable regexp memory (for speed). Only applicable with R.</p></dd> |
| <dt>s</dt> |
| <dd><p>Line-based regexp matching. Only applicable with R.</p></dd> |
| <dt>^</dt> |
| <dd><p>Match at start only. This applies only to string matching |
| (not regexps) and is irrelevant to HTML links.</p></dd> |
| <dt>$</dt> |
| <dd><p>Match at end only. This applies only to string matching |
| (not regexps) and is irrelevant to HTML links.</p></dd> |
| <dt>V</dt> |
| <dd><p>Interpolate environment variables in <code>to-pattern</code>. |
| A string of the form <code>${varname|default}</code> will be replaced by the |
| value of environment variable <code>varname</code>. If that is unset, it |
| is replaced by <code>default</code>. The <code>|default</code> is optional.</p> |
| <p>NOTE: interpolation will only be enabled if |
| <code class="directive"><a href="#proxyhtmlinterp">ProxyHTMLInterp</a></code> is <var>On</var>.</p> |
| </dd> |
| |
| <dt>v</dt> |
| <dd><p>Interpolate environment variables in <code>from-pattern</code>. |
| Patterns supported are as above.</p> |
| <p>NOTE: interpolation will only be enabled if |
| <code class="directive"><a href="#proxyhtmlinterp">ProxyHTMLInterp</a></code> is <var>On</var>.</p> |
| </dd> |
| </dl> |
| |
| <p>The optional fourth <strong>cond</strong> argument defines a condition |
| that will be evaluated per Request, provided |
| <code class="directive"><a href="#proxyhtmlinterp">ProxyHTMLInterp</a></code> is <var>On</var>. |
| If the condition evaluates FALSE the map will not be applied in this request. |
| If TRUE, or if no condition is defined, the map is applied.</p> |
| <p>A <strong>cond</strong> is evaluated by the <a href="../expr.html">Expression Parser</a>. In addition, the simpler syntax of conditions |
| in mod_proxy_html 3.x for HTTPD 2.0 and 2.2 is also supported.</p> |
| |
| </div> |
| </div> |
| <div class="bottomlang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_html.html" title="English"> en </a> | |
| <a href="../fr/mod/mod_proxy_html.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> |
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