From 0511ab7b4f70c4484ef112c5123dd05b64517a49 Mon Sep 17 00:00:00 2001
From: Rich Bowen <rbowen@apache.org>
Date: Mon, 10 Oct 2011 12:54:12 +0000
Subject: [PATCH] Rebuilds varions transformation.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1180930 13f79535-47bb-0310-9956-ffa450edef68
---
 docs/manual/mod/mod_setenvif.xml.ja |   2 +-
 docs/manual/mod/mod_setenvif.xml.ko |   2 +-
 docs/manual/mod/mod_setenvif.xml.tr |   2 +-
 docs/manual/rewrite/tech.html.en    | 148 ++++++++++++++--------------
 4 files changed, 76 insertions(+), 78 deletions(-)

diff --git a/docs/manual/mod/mod_setenvif.xml.ja b/docs/manual/mod/mod_setenvif.xml.ja
index 51dcda04cd..0ccc9a7520 100644
--- a/docs/manual/mod/mod_setenvif.xml.ja
+++ b/docs/manual/mod/mod_setenvif.xml.ja
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
 <?xml-stylesheet type="text/xsl" href="../style/manual.ja.xsl"?>
-<!-- English Revision: 658546:1174747 (outdated) -->
+<!-- English Revision: 658546:1180828 (outdated) -->
 
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/docs/manual/mod/mod_setenvif.xml.ko b/docs/manual/mod/mod_setenvif.xml.ko
index 52a7f5ce73..ae5e5ba4ac 100644
--- a/docs/manual/mod/mod_setenvif.xml.ko
+++ b/docs/manual/mod/mod_setenvif.xml.ko
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="EUC-KR" ?>
 <!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
 <?xml-stylesheet type="text/xsl" href="../style/manual.ko.xsl"?>
-<!-- English Revision: 151408:1174747 (outdated) -->
+<!-- English Revision: 151408:1180828 (outdated) -->
 
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/docs/manual/mod/mod_setenvif.xml.tr b/docs/manual/mod/mod_setenvif.xml.tr
index 23184126df..580372b4d3 100644
--- a/docs/manual/mod/mod_setenvif.xml.tr
+++ b/docs/manual/mod/mod_setenvif.xml.tr
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
 <?xml-stylesheet type="text/xsl" href="../style/manual.tr.xsl"?>
-<!-- English Revision: 658546:1174747 (outdated) -->
+<!-- English Revision: 658546:1180828 (outdated) -->
 <!-- =====================================================
  Translated by: Nilgün Belma Bugüner <nilgun belgeler.org>
    Reviewed by: Orhan Berent <berent belgeler.org>
diff --git a/docs/manual/rewrite/tech.html.en b/docs/manual/rewrite/tech.html.en
index 06c673f5f3..9d577b90cf 100644
--- a/docs/manual/rewrite/tech.html.en
+++ b/docs/manual/rewrite/tech.html.en
@@ -25,87 +25,85 @@
 <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>
+<div id="quickview"><ul id="toc"><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="intro.html">mod_rewrite introduction</a></li><li><a href="remapping.html">Redirection and remapping</a></li><li><a href="access.html">Controlling access</a></li><li><a href="vhosts.html">Virtual hosts</a></li><li><a href="proxy.html">Proxying</a></li><li><a href="rewritemap.html">Using RewriteMap</a></li><li><a href="advanced.html">Advanced techniques</a></li><li><a href="avoid.html">When not to use mod_rewrite</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>
+    <p>The Apache HTTP Server handles requests in several phases. At
+    each of these phases, one or more modules may be called upon to
+    handle that portion of the request lifecycle. Phases include things
+    like URL-to-filename translation, authentication, authorization,
+    content, and logging. (These is not an exhaustive list.)</p>
+
+    <p>mod_rewrite acts in two of these phases (or "hooks", as they are
+    sometimes called) to influence how URLs may be rewritten.</p>
+
+    <p>First, it uses the URL-to-filename translation hook, which occurs
+    after the HTTP request has been read, but before any authorization
+    starts. Secondly, it uses the Fixup hook, which is after the
+    authorizatin phases, and after per-directory configuration files
+    (<code>.htaccess</code> files) have been read, but before the
+    content handler is called.</p>
+
+    <p>So, after a request comes in and a corresponding server or
+    virtual host has been determined, the rewriting engine starts
+    processing any <code>mod_rewrite</code> directives appearing in the
+    per-server configuration. (ie, in the main server configuration file
+    and <code class="directive"><a href="../mod/core.html#virtualhost">&lt;Virtualhost&gt;</a></code>
+    sections.) This happens in the URL-to-filename phase.</p>
+
+    <p>A few steps later, when the finaly data directories are found,
+    the per-directory configuration directives (<code>.htaccess</code>
+    files and <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> blocks) are applied. This
+    happens in the Fixup phase.</p>
+
+    <p>In each of these cases, mod_rewrite rewrites the
+    <code>REQUEST_URI</code> either to a new URI, or to a filename.</p>
+
+    <p>In per-directory context (ie, within <code>.htaccess</code> files
+    and <code>Directory</code> blocks), these rules are being applied
+    after a URI has already been translated to a filename. Because of
+    this, mod_rewrite temporarily translates the filename back into a URI,
+    by stripping off directory paty before appling the rules. (See the
+    <code class="directive"><a href="../mod/mod_rewrite.html#rewritebase">RewriteBase</a></code> directive to
+    see how you can further manipulate how this is handled.) Then, a new
+    internal subrequest is issued with the new URI. This restarts
+    processing of the API phases.</p>
+
+    <p>Because of this further manipulation of the URI in per-directory
+    context, you'll need to take care to craft your rewrite rules
+    differently in that context. In particular, remember that the
+    leading directory path will be stripped off of the URI that your
+    rewrite rules will see. Consider the examples below for further
+    clarification.</p>
+
+    <table class="bordered">
+
+        <tr>
+            <th>Location of rule</th>
+            <th>Rule</th>
+        </tr>
+
+        <tr>
+            <td>VirtualHost section</td>
+            <td>RewriteRule ^/images/(.+)\.jpg /images/$1.gif</td>
+        </tr>
+
+        <tr>
+            <td>.htaccess file in document root</td>
+            <td>RewriteRule ^images/(.+)\.jpg images/$1.gif</td>
+        </tr>
+
+        <tr>
+            <td>.htaccess file in images directory</td>
+            <td>RewriteRule ^(.+)\.jpg $1.gif</td>
+        </tr>
+
+    </table>
+
 </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>
-- 
2.40.0