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| author |   hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
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| committer | hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
| commit | c0b7206652b2852bc574694e7ba07ba1c2acdc00 (patch) | |
| tree | 5cb95cb0e19e03610525903df46279df2c3b7eb1 /rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en | |
| parent | b6d3d6e668b793220f2d3af1bc3e828553dc3fe6 (diff) | |
delete app
Change-Id: Id4c572809969ebe89e946e88063eaed262cff3f2
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en')
| -rw-r--r-- | rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en | 166 |
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diff --git a/rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en b/rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en deleted file mode 100644 index 20c83e6c..00000000 --- a/rubbos/app/apache2/manual/rewrite/rewrite_tech.html.en +++ /dev/null @@ -1,166 +0,0 @@ -<?xml version="1.0" encoding="ISO-8859-1"?> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX - This file is generated from xml source: DO NOT EDIT - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX - --> -<title>Apache mod_rewrite Technical Details - Apache HTTP Server</title> -<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> -<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> -<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /> -<link href="../images/favicon.ico" rel="shortcut icon" /></head> -<body id="manual-page"><div id="page-header"> -<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> -<p class="apache">Apache HTTP Server Version 2.0</p> -<img alt="" src="../images/feather.gif" /></div> -<div class="up"><a href="./index.html"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> -<div id="path"> -<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Apache mod_rewrite Technical Details</h1> -<div class="toplang"> -<p><span>Available Languages: </span><a href="../en/rewrite/rewrite_tech.html" title="English"> en </a></p> -</div> - -<p>This document discusses some of the technical details of mod_rewrite -and URL matching.</p> -</div> -<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#Internal">Internal Processing</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#InternalAPI">API Phases</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#InternalRuleset">Ruleset Processing</a></li> -</ul><h3>See also</h3><ul class="seealso"><li><a href="../mod/mod_rewrite.html">Module -documentation</a></li><li><a href="rewrite_intro.html">mod_rewrite -introduction</a></li><li><a href="rewrite_guide.html">Practical solutions to common -problems</a></li></ul></div> -<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> -<div class="section"> -<h2><a name="Internal" id="Internal">Internal Processing</a></h2> - - <p>The internal processing of this module is very complex but - needs to be explained once even to the average user to avoid - common mistakes and to let you exploit its full - functionality.</p> -</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> -<div class="section"> -<h2><a name="InternalAPI" id="InternalAPI">API Phases</a></h2> - - <p>First you have to understand that when Apache processes a - HTTP request it does this in phases. A hook for each of these - phases is provided by the Apache API. Mod_rewrite uses two of - these hooks: the URL-to-filename translation hook which is - used after the HTTP request has been read but before any - authorization starts and the Fixup hook which is triggered - after the authorization phases and after the per-directory - config files (<code>.htaccess</code>) have been read, but - before the content handler is activated.</p> - - <p>So, after a request comes in and Apache has determined the - corresponding server (or virtual server) the rewriting engine - starts processing of all mod_rewrite directives from the - per-server configuration in the URL-to-filename phase. A few - steps later when the final data directories are found, the - per-directory configuration directives of mod_rewrite are - triggered in the Fixup phase. In both situations mod_rewrite - rewrites URLs either to new URLs or to filenames, although - there is no obvious distinction between them. This is a usage - of the API which was not intended to be this way when the API - was designed, but as of Apache 1.x this is the only way - mod_rewrite can operate. To make this point more clear - remember the following two points:</p> - - <ol> - <li>Although mod_rewrite rewrites URLs to URLs, URLs to - filenames and even filenames to filenames, the API - currently provides only a URL-to-filename hook. In Apache - 2.0 the two missing hooks will be added to make the - processing more clear. But this point has no drawbacks for - the user, it is just a fact which should be remembered: - Apache does more in the URL-to-filename hook than the API - intends for it.</li> - - <li> - Unbelievably mod_rewrite provides URL manipulations in - per-directory context, <em>i.e.</em>, within - <code>.htaccess</code> files, although these are reached - a very long time after the URLs have been translated to - filenames. It has to be this way because - <code>.htaccess</code> files live in the filesystem, so - processing has already reached this stage. In other - words: According to the API phases at this time it is too - late for any URL manipulations. To overcome this chicken - and egg problem mod_rewrite uses a trick: When you - manipulate a URL/filename in per-directory context - mod_rewrite first rewrites the filename back to its - corresponding URL (which is usually impossible, but see - the <code>RewriteBase</code> directive below for the - trick to achieve this) and then initiates a new internal - sub-request with the new URL. This restarts processing of - the API phases. - - <p>Again mod_rewrite tries hard to make this complicated - step totally transparent to the user, but you should - remember here: While URL manipulations in per-server - context are really fast and efficient, per-directory - rewrites are slow and inefficient due to this chicken and - egg problem. But on the other hand this is the only way - mod_rewrite can provide (locally restricted) URL - manipulations to the average user.</p> - </li> - </ol> - - <p>Don't forget these two points!</p> -</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> -<div class="section"> -<h2><a name="InternalRuleset" id="InternalRuleset">Ruleset Processing</a></h2> - - <p>Now when mod_rewrite is triggered in these two API phases, it - reads the configured rulesets from its configuration - structure (which itself was either created on startup for - per-server context or during the directory walk of the Apache - kernel for per-directory context). Then the URL rewriting - engine is started with the contained ruleset (one or more - rules together with their conditions). The operation of the - URL rewriting engine itself is exactly the same for both - configuration contexts. Only the final result processing is - different. </p> - - <p>The order of rules in the ruleset is important because the - rewriting engine processes them in a special (and not very - obvious) order. The rule is this: The rewriting engine loops - through the ruleset rule by rule (<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directives) and - when a particular rule matches it optionally loops through - existing corresponding conditions (<code>RewriteCond</code> - directives). For historical reasons the conditions are given - first, and so the control flow is a little bit long-winded. See - Figure 1 for more details.</p> -<p class="figure"> - <img src="../images/mod_rewrite_fig1.gif" width="428" height="385" alt="[Needs graphics capability to display]" /><br /> - <dfn>Figure 1:</dfn>The control flow through the rewriting ruleset -</p> - <p>As you can see, first the URL is matched against the - <em>Pattern</em> of each rule. When it fails mod_rewrite - immediately stops processing this rule and continues with the - next rule. If the <em>Pattern</em> matches, mod_rewrite looks - for corresponding rule conditions. If none are present, it - just substitutes the URL with a new value which is - constructed from the string <em>Substitution</em> and goes on - with its rule-looping. But if conditions exist, it starts an - inner loop for processing them in the order that they are - listed. For conditions the logic is different: we don't match - a pattern against the current URL. Instead we first create a - string <em>TestString</em> by expanding variables, - back-references, map lookups, <em>etc.</em> and then we try - to match <em>CondPattern</em> against it. If the pattern - doesn't match, the complete set of conditions and the - corresponding rule fails. If the pattern matches, then the - next condition is processed until no more conditions are - available. If all conditions match, processing is continued - with the substitution of the URL with - <em>Substitution</em>.</p> - -</div></div> -<div class="bottomlang"> -<p><span>Available Languages: </span><a href="../en/rewrite/rewrite_tech.html" title="English"> en </a></p> -</div><div id="footer"> -<p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> -<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div> -</body></html>
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