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From sl...@apache.org
Subject cvs commit: httpd-2.0/docs/manual env.xml filter.xml handler.xml env.html.en filter.html.en handler.html.en
Date Sat, 27 Jul 2002 15:37:03 GMT
slive       2002/07/27 08:37:03

  Modified:    docs/manual env.html.en filter.html.en handler.html.en
  Added:       docs/manual env.xml filter.xml handler.xml
  Log:
  New XML.
  
  Submitted by:	Vincent de Lau <vincent@delau.nl>
  
  Revision  Changes    Path
  1.22      +257 -312  httpd-2.0/docs/manual/env.html.en
  
  Index: env.html.en
  ===================================================================
  RCS file: /home/cvs/httpd-2.0/docs/manual/env.html.en,v
  retrieving revision 1.21
  retrieving revision 1.22
  diff -u -d -b -u -r1.21 -r1.22
  --- env.html.en	11 Jul 2002 18:55:02 -0000	1.21
  +++ env.html.en	27 Jul 2002 15:37:03 -0000	1.22
  @@ -1,20 +1,8 @@
  -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  -    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  -
  -<html xmlns="http://www.w3.org/1999/xhtml">
  -  <head>
  -    <meta name="generator" content="HTML Tidy, see www.w3.org" />
  -
  -    <title>Environment Variables in Apache</title>
  -  </head>
  -  <!-- Background white, links blue (unvisited), navy (visited), red (active) -->
  -
  -  <body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
  -  vlink="#000080" alink="#FF0000">
  -    <!--#include virtual="header.html" -->
  -
  -    <h1 align="center">Environment Variables in Apache</h1>
  -
  +<html xmlns="http://www.w3.org/TR/xhtml1/strict"><head><!-- 
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +                This file is generated from xml source: DO NOT EDIT
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +        --><title>Environment Variables in Apache- Apache HTTP Server</title><link href="./style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="./images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Environment Variables in Apache</h1>
       <p>The Apache HTTP Server provides a mechanism for storing
       information in named variables that are called <em>environment
       variables</em>. This information can be used to control various
  @@ -34,60 +22,21 @@
       server itself runs, you must use the standard environment
       manipulation mechanisms provided by your operating system
       shell.</p>
  +  <ul><li><a href="#setting">Setting Environment Variables</a><ul><li><a href="#basic-manipulation">Basic Environment Manipulation</a></li><li><a href="#conditional">Conditional Per-Request Settings</a></li><li><a href="#unique-identifiers">Unique Identifiers</a></li><li><a href="#standard-cgi">Standard CGI Variables</a></li><li><a href="#caveats">Some Caveats</a></li></ul></li><li><a href="#using">Using Environment Variables</a><ul><li><a href="#cgi-scripts">CGI Scripts</a></li><li><a href="#ssi-pages">SSI Pages</a></li><li><a href="#access-control">Access Control</a></li><li><a href="#logging">Conditional Logging</a></li><li><a href="#response-headers">Conditional Response Headers</a></li><li><a href="#url-rewriting">URL Rewriting</a></li></ul></li><li><a href="#special">Special Purpose Environment Variables</a><ul><li><a href="#downgrade">downgrade-1.0</a></li><li><a href="#force-no-vary">force-no-vary</a></li><li><a href="#force-response">force-response-1.0</a></li><li><a href="#nokeepalive">nokeepalive</a></li><li><a href="#redirect-carefully">redirect-carefully</a></li></ul></li><li><a href="#examples">Examples</a><ul><li><a href="#misbehaving">Changing protocol behavior with misbehaving clients</a></li><li><a href="#no-img-log">Do not log requests for images in the access log</a></li><li><a href="#image-theft">Prevent "Image Theft"</a></li></ul></li></ul><hr/><h2><a name="setting">Setting Environment Variables</a></h2>
   
  -    <ul>
  -      <li><a href="#setting">Setting Environment Variables</a></li>
  -
  -      <li><a href="#using">Using Environment Variables</a></li>
  -
  -      <li><a href="#special">Special Purpose Environment
  -      Variables</a></li>
  -
  -      <li><a href="#examples">Examples</a></li>
  -    </ul>
  -    <hr />
  +    <table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="./mod/mod_env.html">mod_env</a></code>, <br/><code><a href="./mod/mod_rewrite.html">mod_rewrite</a></code>, <br/><code><a href="./mod/mod_setenvif.html">mod_setenvif</a></code>, <br/><code><a href="./mod/mod_unique_id.html">mod_unique_id</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="./mod/mod_setenvif.html#browsermatch" class="directive"><code class="directive">BrowserMatch</code></a><br/><a href="./mod/mod_setenvif.html#browsermatchnocase" class="directive"><code class="directive">BrowserMatchNoCase</code></a><br/><a href="./mod/mod_env.html#passenv" class="directive"><code class="directive">PassEnv</code></a><br/><a href="./mod/mod_rewrite.html#rewriterule" class="directive"><code class="directive">RewriteRule</code></a><br/><a href="./mod/mod_env.html#setenv" class="directive"><code class="directive">SetEnv</code></a><br/><a href="./mod/mod_setenvif.html#setenvif" class="directive"><code class="directive">SetEnvIf</code></a><br/><a href="./mod/mod_setenvif.html#setenvifnocase" class="directive"><code class="directive">SetEnvIfNoCase</code></a><br/><a href="./mod/mod_env.html.html#unsetenv" class="directive"><code class="directive">UnsetEnv</code></a><br/></td></tr></table>
   
  -    <h2><a id="setting" name="setting">Setting Environment
  -    Variables</a></h2>
  +    <h3><a name="basic-manipulation">Basic Environment Manipulation</a></h3>
   
  -    <table border="1">
  -      <tr>
  -        <td valign="top"><strong>Related Modules</strong><br />
  -         <br />
  -         <a href="mod/mod_env.html">mod_env</a><br />
  -         <a href="mod/mod_rewrite.html">mod_rewrite</a><br />
  -         <a href="mod/mod_setenvif.html">mod_setenvif</a><br />
  -         <a href="mod/mod_unique_id.html">mod_unique_id</a><br />
  -         </td>
   
  -        <td valign="top"><strong>Related Directives</strong><br />
  -         <br />
  -         <a
  -        href="mod/mod_setenvif.html#BrowserMatch">BrowserMatch</a><br />
  -         <a
  -        href="mod/mod_setenvif.html#BrowserMatchNoCase">BrowserMatchNoCase</a><br />
  -         <a href="mod/mod_env.html#passenv">PassEnv</a><br />
  -         <a
  -        href="mod/mod_rewrite.html#RewriteRule">RewriteRule</a><br />
  -         <a href="mod/mod_env.html#setenv">SetEnv</a><br />
  -         <a
  -        href="mod/mod_setenvif.html#SetEnvIf">SetEnvIf</a><br />
  -         <a
  -        href="mod/mod_setenvif.html#SetEnvIfNoCase">SetEnvIfNoCase</a><br />
  -         <a href="mod/mod_env.html#unsetenv">UnsetEnv</a><br />
  -         </td>
  -      </tr>
  -    </table>
  +        <p>The most basic way to set an environment variable in Apache
  +        is using the unconditional <a href="./mod/mod_env.html#setenv" class="directive"><code class="directive">SetEnv</code></a> directive. Variables may also be passed from
  +        the environment of the shell which started the server using the
  +        <a href="./mod/mod_env.html#passenv" class="directive"><code class="directive">PassEnv</code></a> directive.</p>
   
  -    <h3>Basic Environment Manipulation</h3>
   
  -    <p>The most basic way to set an environment variable in Apache
  -    is using the unconditional <code>SetEnv</code> directive.
  -    Variables may also be passed from the environment of the shell
  -    which started the server using the <code>PassEnv</code>
  -    directive.</p>
  +    <h3><a name="conditional">Conditional Per-Request Settings</a></h3>
   
  -    <h3>Conditional Per-Request Settings</h3>
   
       <p>For additional flexibility, the directives provided by
       mod_setenvif allow environment variables to be set on a
  @@ -95,18 +44,21 @@
       requests. For example, a variable could be set only when a
       specific browser (User-Agent) is making a request, or only when
       a specific Referer [sic] header is found. Even more flexibility
  -    is available through the mod_rewrite's <code>RewriteRule</code>
  -    which uses the <code>[E=...]</code> option to set environment
  -    variables.</p>
  +        is available through the mod_rewrite's <a href="./mod/mod_rewrite.html#rewriterule" class="directive"><code class="directive">RewriteRule</code></a> which uses the 
  +        <code>[E=...]</code> option to set environment variables.</p>
  +    
  +    
  +    <h3><a name="unique-identifiers">Unique Identifiers</a></h3>
   
  -    <h3>Unique Identifiers</h3>
   
       <p>Finally, mod_unique_id sets the environment variable
       <code>UNIQUE_ID</code> for each request to a value which is
       guaranteed to be unique across "all" requests under very
       specific conditions.</p>
   
  -    <h3>Standard CGI Variables</h3>
  +    
  +    <h3><a name="standard-cgi">Standard CGI Variables</a></h3>
  +        
   
       <p>In addition to all environment variables set within the
       Apache configuration and passed from the shell, CGI scripts and
  @@ -115,7 +67,9 @@
       the <a href="http://cgi-spec.golux.com/">CGI
       specification</a>.</p>
   
  -    <h3>Some Caveats</h3>
  +    
  +    <h3><a name="caveats">Some Caveats</a></h3>
  +        
   
       <ul>
         <li>It is not possible to override or change the standard CGI
  @@ -134,41 +88,14 @@
         restriction will be replaced by an underscore when passed to
         CGI scripts and SSI pages.</li>
       </ul>
  -    <hr />
   
  -    <h2><a id="using" name="using">Using Environment
  -    Variables</a></h2>
  +  <h2><a name="using">Using Environment Variables</a></h2>
   
  -    <table border="1">
  -      <tr>
  -        <td valign="top"><strong>Related Modules</strong><br />
  -         <br />
  -         <a href="mod/mod_access.html">mod_access</a><br />
  -         <a href="mod/mod_cgi.html">mod_cgi</a><br />
  -         <a href="mod/mod_headers.html">mod_headers</a><br />
  -         <a href="mod/mod_include.html">mod_include</a><br />
  -         <a href="mod/mod_log_config.html">mod_log_config</a><br />
  -         <a href="mod/mod_rewrite.html">mod_rewrite</a><br />
  -         </td>
   
  -        <td valign="top"><strong>Related Directives</strong><br />
  -         <br />
  -         <a href="mod/mod_access.html#allow">Allow</a><br />
  -         <a
  -        href="mod/mod_log_config.html#customlog">CustomLog</a><br />
  -         <a href="mod/mod_access.html#deny">Deny</a><br />
  -         <a href="mod/mod_headers.html#Header">Header</a><br />
  -         <a
  -        href="mod/mod_log_config.html#logformat">LogFormat</a><br />
  -         <a
  -        href="mod/mod_rewrite.html#RewriteCond">RewriteCond</a><br />
  -         <a
  -        href="mod/mod_rewrite.html#RewriteRule">RewriteRule</a><br />
  -         </td>
  -      </tr>
  -    </table>
  +    <table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="./mod/mod_access.html">mod_access</a></code>, <br/><code><a href="./mod/mod_cgi.html">mod_cgi</a></code>, <br/><code><a href="./mod/mod_headers.html">mod_headers</a></code>, <br/><code><a href="./mod/mod_include.html">mod_include</a></code>, <br/><code><a href="./mod/mod_log_config.html">mod_log_config</a></code>, <br/><code><a href="./mod/mod_rewrite.html">mod_rewrite</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="./mod/mod_access.html#allow" class="directive"><code class="directive">Allow</code></a><br/><a href="./mod/mod_log_config.html#customlog" class="directive"><code class="directive">CustomLog</code></a><br/><a href="./mod/mod_access.html#deny" class="directive"><code class="directive">Deny</code></a><br/><a href="./mod/mod_headers.html#header" class="directive"><code class="directive">Header</code></a><br/><a href="./mod/mod_log_config.html#logformat" class="directive"><code class="directive">LogFormat</code></a><br/><a href="./mod/mod_rewrite.html#rewritecond" class="directive"><code class="directive">RewriteCond</code></a><br/><a href="./mod/mod_rewrite.html#rewriterule" class="directive"><code class="directive">RewriteRule</code></a><br/></td></tr></table>
  +
  +    <h3><a name="cgi-scripts">CGI Scripts</a></h3>
   
  -    <h3>CGI Scripts</h3>
   
       <p>One of the primary uses of environment variables is to
       communicate information to CGI scripts. As discussed above, the
  @@ -177,7 +104,9 @@
       set within the Apache configuration. For more details, see the
       <a href="howto/cgi.html">CGI tutorial</a>.</p>
   
  -    <h3>SSI Pages</h3>
  +    
  +    <h3><a name="ssi-pages">SSI Pages</a></h3>
  +        
   
       <p>Server-parsed (SSI) documents processed by mod_include's
       <code>INCLUDES</code> filter can print environment variables
  @@ -185,93 +114,109 @@
       variables in flow control elements to makes parts of a page
       conditional on characteristics of a request. Apache also
       provides SSI pages with the standard CGI environment variables
  -    as discussed above. For more details, see the <a
  -    href="howto/ssi.html">SSI tutorial</a>.</p>
  +        as discussed above. For more details, see the <a href="howto/ssi.html">SSI tutorial</a>.</p>
  +    
  +    
  +    <h3><a name="access-control">Access Control</a></h3>
   
  -    <h3>Access Control</h3>
   
       <p>Access to the server can be controlled based on the value of
       environment variables using the <code>allow from env=</code>
       and <code>deny from env=</code> directives. In combination with
  -    <code>SetEnvIf</code>, this allows for flexible control of
  -    access to the server based on characteristics of the client.
  -    For example, you can use these directives to deny access to a
  -    particular browser (User-Agent).</p>
  +        <a href="./mod/mod_setenvif.html#setenvif" class="directive"><code class="directive">SetEnvIf</code></a>, this 
  +        allows for flexible control of access to the server based on 
  +        characteristics of the client. For example, you can use these 
  +        directives to deny access to a particular browser (User-Agent).
  +        </p>
  +    
  +    
  +    <h3><a name="logging">Conditional Logging</a></h3>
   
  -    <h3>Conditional Logging</h3>
   
       <p>Environment variables can be logged in the access log using
  -    the <code>LogFormat</code> option <code>%e</code>. In addition,
  -    the decision on whether or not to log requests can be made
  -    based on the status of environment variables using the
  -    conditional form of the <code>CustomLog</code> directive. In
  -    combination with <code>SetEnvIf</code> this allows for flexible
  -    control of which requests are logged. For example, you can
  -    choose not to log requests for filenames ending in
  -    <code>gif</code>, or you can choose to only log requests from
  -    clients which are outside your subnet.</p>
  +        the <a href="./mod/mod_log_config.html#logformat" class="directive"><code class="directive">LogFormat</code></a>
  +        option <code>%e</code>. In addition, the decision on whether
  +        or not to log requests can be made based on the status of 
  +        environment variables using the conditional form of the 
  +        <a href="./mod/mod_log_config.html#customlog" class="directive"><code class="directive">CustomLog</code></a>
  +        directive. In combination with <a href="./mod/mod_setenvif.html#setenvif" class="directive"><code class="directive">SetEnvIf</code></a> this allows for flexible control of which 
  +        requests are logged. For example, you can choose not to log 
  +        requests for filenames ending in <code>gif</code>, or you can
  +        choose to only log requests from clients which are outside your
  +        subnet.</p>
   
  -    <h3>Conditional Response Headers</h3>
   
  -    <p>The <code>Header</code> directive can use the presence or
  +    <h3><a name="response-headers">Conditional Response Headers</a></h3>
  +        
  +    
  +        <p>The <a href="./mod/mod_headers.html#header" class="directive"><code class="directive">Header</code></a>
  +        directive can use the presence or
       absence of an environment variable to determine whether or not
       a certain HTTP header will be placed in the response to the
       client. This allows, for example, a certain response header to
       be sent only if a corresponding header is received in the
       request from the client.</p>
   
  -    <h3>URL Rewriting</h3>
  +    
  +    <h3><a name="url-rewriting">URL Rewriting</a></h3>
  +        
   
       <p>The <code>%{ENV:...}</code> form of <em>TestString</em> in
  -    the <code>RewriteCond</code> allows mod_rewrite's rewrite
  +        the <a href="./mod/mod_rewrite.html#rewritecond" class="directive"><code class="directive">RewriteCond</code></a>
  +        allows mod_rewrite's rewrite
       engine to make decisions conditional on environment variables.
       Note that the variables accessible in mod_rewrite without the
       <code>ENV:</code> prefix are not actually environment
       variables. Rather, they are variables special to mod_rewrite
       which cannot be accessed from other modules.</p>
  -    <hr />
   
  -    <h2><a id="special" name="special">Special Purpose Environment
  -    Variables</a></h2>
  +  <h2><a name="special">Special Purpose Environment Variables</a></h2>
  +    
   
       <p>Interoperability problems have led to the introduction of
       mechanisms to modify the way Apache behaves when talking to
       particular clients. To make these mechanisms as flexible as
       possible, they are invoked by defining environment variables,
  -    typically with <a
  -    href="mod/mod_setenvif.html#browsermatch">BrowserMatch</a>,
  -    though <a href="mod/mod_env.html#setenv">SetEnv</a> and <a
  -    href="mod/mod_env.html#passenv">PassEnv</a> could also be used,
  +        typically with <a href="./mod/mod_setenvif.html#browsermatch" class="directive"><code class="directive">BrowserMatch</code></a>,
  +        though <a href="./mod/mod_env.html#setenv" class="directive"><code class="directive">SetEnv</code></a> and 
  +        <a href="./mod/mod_env.html#passenv" class="directive"><code class="directive">PassEnv</code></a> could also be used,
       for example.</p>
   
  -    <h2>downgrade-1.0</h2>
  +    <h3><a name="downgrade">downgrade-1.0</a></h3>
  +        
   
       <p>This forces the request to be treated as a HTTP/1.0 request
       even if it was in a later dialect.</p>
   
  -    <h2>force-no-vary</h2>
  +    
  +    <h3><a name="force-no-vary">force-no-vary</a></h3>
  +        
   
       <p>This causes any <code>Vary</code> fields to be removed from
       the response header before it is sent back to the client. Some
  -    clients don't interpret this field correctly (see the <a
  -    href="misc/known_client_problems.html">known client
  +        clients don't interpret this field correctly (see the <a href="misc/known_client_problems.html">known client
       problems</a> page); setting this variable can work around this
       problem. Setting this variable also implies
       <strong>force-response-1.0</strong>.</p>
   
  -    <h2>force-response-1.0</h2>
  +    
  +    <h3><a name="force-response">force-response-1.0</a></h3>
  +        
   
       <p>This forces an HTTP/1.0 response when set. It was originally
       implemented as a result of a problem with AOL's proxies. Some
       clients may not behave correctly when given an HTTP/1.1
       response, and this can be used to interoperate with them.</p>
   
  -    <h2>nokeepalive</h2>
   
  -    <p>This disables <a
  -    href="mod/core.html#keepalive">KeepAlive</a> when set.</p>
  +    <h3><a name="nokeepalive">nokeepalive</a></h3>
  +        
  +    
  +        <p>This disables <a href="./mod/core.html#keepalive" class="directive"><code class="directive">KeepAlive</code></a> when set.</p>
  +    
  +    
  +    <h3><a name="redirect-carefully">redirect-carefully</a></h3>
   
  -    <h2>redirect-carefully</h2>
   
       <p>This forces the server to be more careful when sending a redirect
       to the client.  This is typically used when a client has a known
  @@ -280,14 +225,16 @@
       a problem handling redirects on directory resources via DAV 
       methods.</p>
   
  -    <hr />
  -    <h2><a id="examples" name="examples">Examples</a></h2>
   
  -    <h3>Changing protocol behavior with misbehaving clients</h3>
  +  <h2><a name="examples">Examples</a></h2>
  +    
  +    
  +    <h3><a name="misbehaving">Changing protocol behavior with misbehaving clients</a></h3>
  +        
   
       <p>We recommend that the following lines be included in
       httpd.conf to deal with known client problems.</p>
  -<pre>
  +<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><pre>
   #
   # The following directives modify normal HTTP response behavior.
   # The first directive disables keepalive for Netscape 2.x and browsers that
  @@ -306,45 +253,43 @@
   #
   BrowserMatch "RealPlayer 4\.0" force-response-1.0
   BrowserMatch "Java/1\.0" force-response-1.0
  -BrowserMatch "JDK/1\.0" force-response-1.0
  -</pre>
  +BrowserMatch "JDK/1\.0" force-response-1.0</pre></code></td></tr></table></blockquote>
  +
  +    
  +    <h3><a name="no-img-log">Do not log requests for images in the access log</a></h3>
   
  -    <h3>Do not log requests for images in the access log</h3>
   
       <p>This example keeps requests for images from appearing in the
       access log. It can be easily modified to prevent logging of
       particular directories, or to prevent logging of requests
       coming from particular hosts.</p>
  -<pre>
  -    SetEnvIf Request_URI \.gif image-request
  -    SetEnvIf Request_URI \.jpg image-request
  -    SetEnvIf Request_URI \.png image-request
  -    CustomLog logs/access_log common env=!image-request
  -</pre>
  +    <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><pre>
  +SetEnvIf Request_URI \.gif image-request
  +SetEnvIf Request_URI \.jpg image-request
  +SetEnvIf Request_URI \.png image-request
  +CustomLog logs/access_log common env=!image-request</pre></code></td></tr></table></blockquote>
  +    
  +    
  +    <h3><a name="image-theft">Prevent "Image Theft"</a></h3>
   
  -    <h3>Prevent "Image Theft"</h3>
   
       <p>This example shows how to keep people not on your server
       from using images on your server as inline-images on their
       pages. This is not a recommended configuration, but it can work
       in limited circumstances. We assume that all your images are in
       a directory called /web/images.</p>
  -<pre>
  -    SetEnvIf Referer "^http://www.example.com/" local_referal
  -    # Allow browsers that do not send Referer info
  -    SetEnvIf Referer "^$" local_referal
  -    &lt;Directory /web/images&gt;
  +    <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><pre>
  +SetEnvIf Referer "^http://www.example.com/" local_referal
  +# Allow browsers that do not send Referer info
  +SetEnvIf Referer "^$" local_referal
  +&lt;Directory /web/images&gt;
          Order Deny,Allow
          Deny from all
          Allow from env=local_referal
  -    &lt;/Directory&gt;
  -</pre>
  +&lt;/Directory&gt;</pre></code></td></tr></table></blockquote>
   
       <p>For more information about this technique, see the
  -    ApacheToday tutorial " <a
  -    href="http://apachetoday.com/news_story.php3?ltsn=2000-06-14-002-01-PS">
  +        ApacheToday tutorial " <a href="http://apachetoday.com/news_story.php3?ltsn=2000-06-14-002-01-PS">
       Keeping Your Images from Adorning Other Sites</a>".</p>
  -    <!--#include virtual="footer.html" -->
  -  </body>
  -</html>
   
  +  </blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="./images/index.gif" alt="Index"/></a><a href="./"><img src="./images/home.gif" alt="Home"/></a></body></html>
  \ No newline at end of file
  
  
  
  1.10      +19 -60    httpd-2.0/docs/manual/filter.html.en
  
  Index: filter.html.en
  ===================================================================
  RCS file: /home/cvs/httpd-2.0/docs/manual/filter.html.en,v
  retrieving revision 1.9
  retrieving revision 1.10
  diff -u -d -b -u -r1.9 -r1.10
  --- filter.html.en	25 Jul 2002 21:46:38 -0000	1.9
  +++ filter.html.en	27 Jul 2002 15:37:03 -0000	1.10
  @@ -1,46 +1,12 @@
  -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  -    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  -
  -<html xmlns="http://www.w3.org/1999/xhtml">
  -  <head>
  -    <meta name="generator" content="HTML Tidy, see www.w3.org" />
  -
  -    <title>Filters - Apache HTTPD</title>
  -  </head>
  -  <!-- Background white, links blue (unvisited), navy (visited), red (active) -->
  -
  -  <body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
  -  vlink="#000080" alink="#FF0000">
  -    <!--#include virtual="header.html" -->
  -
  -    <h1 align="center">Filters</h1>
  -
  -    <table border="1">
  -      <tr>
  -        <td valign="top"><strong>Related Modules</strong><br />
  -         <br />
  -         <a href="mod/mod_deflate.html">mod_deflate</a><br />
  -         <a href="mod/mod_ext_filter.html">mod_ext_filter</a><br />
  -         <a href="mod/mod_include.html">mod_include</a><br />
  -         </td>
  +<html xmlns="http://www.w3.org/TR/xhtml1/strict"><head><!-- 
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +                This file is generated from xml source: DO NOT EDIT
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +        --><title>Filters- Apache HTTP Server</title><link href="./style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="./images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Filters</h1>
  +    <p>This document describes the use of filters in Apache.</p>
  +  <ul><li><a href="#filters">Filters</a></li></ul><hr/><h2><a name="filters">Filters</a></h2>
   
  -        <td valign="top"><strong>Related Directives</strong><br />
  -         <br />
  -         <a
  -        href="mod/mod_mime.html#addinputfilter">AddInputFilter</a><br />
  -         <a
  -        href="mod/mod_mime.html#addoutputfilter">AddOutputFilter</a><br />
  -         <a
  -        href="mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a><br />
  -         <a
  -        href="mod/mod_ext_filter.html#extfilteroptions">ExtFilterOptions</a><br />
  -         <a
  -        href="mod/core.html#setinputfilter">SetInputFilter</a><br />
  -         <a
  -        href="mod/core.html#setoutputfilter">SetOutputFilter</a><br />
  -         </td>
  -      </tr>
  -    </table>
  +    <table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="./mod/mod_deflate.html">mod_deflate</a></code>, <br/><code><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code>, <br/><code><a href="./mod/mod_include.html">mod_include</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="./mod/mod_mime.html#addinputfilter" class="directive"><code class="directive">AddInputFilter</code></a><br/><a href="./mod/mod_mime.html#addoutputfilter" class="directive"><code class="directive">AddOutputFilter</code></a><br/><a href="./mod/mod_ext_filter.html#extfilterdefine" class="directive"><code class="directive">ExtFilterDefine</code></a><br/><a href="./mod/mod_ext_filter.html#extfilteroptions" class="directive"><code class="directive">ExtFilterOptions</code></a><br/><a href="./mod/core.html.html#setinputfilter" class="directive"><code class="directive">SetInputFilter</code></a><br/><a href="./mod/core.html.html#setoutputfilter" class="directive"><code class="directive">SetOutputFilter</code></a><br/></td></tr></table>
   
       <p>A <em>filter</em> is a process that is applied to data that
       is sent or received by the server. Data sent by clients to the
  @@ -53,25 +19,18 @@
       as chunking and byte-range request handling. In addition, modules
       can provide filters that are selectable using run-time
       configuration directives. The set of filters that apply to data
  -    can be manipulated with the <code>SetInputFilter</code>,
  -    <code>SetOutputFilter</code>, <code>AddInputFilter</code>, and
  -    <code>AddOutputFilter</code> directives.</p>
  +    can be manipulated with the <a href="./mod/core.html.html#setinputfilter" class="directive"><code class="directive">SetInputFilter</code></a>, <a href="./mod/core.html.html#setoutputfilter" class="directive"><code class="directive">SetOutputFilter</code></a>, <a href="./mod/mod_mime.html#addinputfilter" class="directive"><code class="directive">AddInputFilter</code></a>, and <a href="./mod/mod_mime.html#addoutputfilter" class="directive"><code class="directive">AddOutputFilter</code></a> directives.</p>
   
       <p>The following user-selectable filters are currently provided
       with the Apache HTTP Server distribution.</p>
   
  -<dl>
  -<dt>INCLUDES</dt> <dd>Server-Side Includes processing by <a
  -href="mod/mod_include.html">mod_include</a></dd>
  -<dt>DEFLATE</dt> <dd>Compress output before sending it to
  -the client using <a href="mod/mod_deflate.html">mod_deflate</a></dd>
  -</dl>
  +    <dl>
  +      <dt>INCLUDES</dt>
  +      <dd>Server-Side Includes processing by <code><a href="./mod/mod_include.html">mod_include</a></code></dd>
  +      <dt>DEFLATE</dt>
  +      <dd>Compress output before sending it to the client using <code><a href="./mod/mod_include.html">mod_include</a></code></dd>
  +    </dl>
   
  -    <p>In addition, the module <a
  -    href="mod/mod_ext_filter.html">mod_ext_filter</a> allows
  +    <p>In addition, the module <code><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code> allows
       for external programs to be defined as filters.</p>
  -
  -    <!--#include virtual="footer.html" -->
  -  </body>
  -</html>
  -
  +  </blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="./images/index.gif" alt="Index"/></a><a href="./"><img src="./images/home.gif" alt="Home"/></a></body></html>
  \ No newline at end of file
  
  
  
  1.26      +57 -106   httpd-2.0/docs/manual/handler.html.en
  
  Index: handler.html.en
  ===================================================================
  RCS file: /home/cvs/httpd-2.0/docs/manual/handler.html.en,v
  retrieving revision 1.25
  retrieving revision 1.26
  diff -u -d -b -u -r1.25 -r1.26
  --- handler.html.en	25 Jul 2002 21:46:38 -0000	1.25
  +++ handler.html.en	27 Jul 2002 15:37:03 -0000	1.26
  @@ -1,59 +1,13 @@
  -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  -    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  -
  -<html xmlns="http://www.w3.org/1999/xhtml">
  -  <head>
  -    <meta name="generator" content="HTML Tidy, see www.w3.org" />
  -
  -    <title>Apache's Handler Use</title>
  -  </head>
  -  <!-- Background white, links blue (unvisited), navy (visited), red (active) -->
  -
  -  <body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
  -  vlink="#000080" alink="#FF0000">
  -    <!--#include virtual="header.html" -->
  -
  -    <h1 align="center">Apache's Handler Use</h1>
  -
  -    <ul>
  -      <li><a href="#definition">What is a Handler</a></li>
  -
  -      <li><a href="#examples">Examples</a></li>
  -
  -      <li><a href="#programmer">Programmer's Note</a></li>
  -    </ul>
  -    <hr />
  +<html xmlns="http://www.w3.org/TR/xhtml1/strict"><head><!-- 
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +                This file is generated from xml source: DO NOT EDIT
  +          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  +        --><title>Apache's Handler Use- Apache HTTP Server</title><link href="./style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="./images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache's Handler Use</h1>
  +    <p>This document describes the use of Apache's Handlers.</p>
  +  <ul><li><a href="#definition">What is a Handler</a></li><li><a href="#examples">Examples</a><ul><li><a href="#example1">Modifying static content using a CGI script</a></li><li><a href="#example2">Files with HTTP headers</a></li></ul></li><li><a href="#programmer">Programmer's Note</a></li></ul><hr/><h2><a name="definition">What is a Handler</a></h2>
   
  -    <h2><a id="definition" name="definition">What is a
  -    Handler</a></h2>
  +    <table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="./mod/mod_actions.html">mod_actions</a></code>, <br/><code><a href="./mod/mod_asis.html">mod_asis</a></code>, <br/><code><a href="./mod/mod_cgi.html">mod_cgi</a></code>, <br/><code><a href="./mod/mod_imap.html">mod_imap</a></code>, <br/><code><a href="./mod/mod_info.html">mod_info</a></code>, <br/><code><a href="./mod/mod_mime.html">mod_mime</a></code>, <br/><code><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>, <br/><code><a href="./mod/mod_status.html">mod_status</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="./mod/mod_actions.html#action" class="directive"><code class="directive">Action</code></a><br/><a href="./mod/mod_mime.html#addhandler" class="directive"><code class="directive">AddHandler</code></a><br/><a href="./mod/mod_mime.html#removehandler" class="directive"><code class="directive">RemoveHandler</code></a><br/><a href="./mod/mod_mime.html#sethandler" class="directive"><code class="directive">SetHandler</code></a><br/></td></tr></table>
   
  -    <table border="1">
  -      <tr>
  -        <td valign="top"><strong>Related Modules</strong><br />
  -         <br />
  -         <a href="mod/mod_actions.html">mod_actions</a><br />
  -         <a href="mod/mod_asis.html">mod_asis</a><br />
  -         <a href="mod/mod_cgi.html">mod_cgi</a><br />
  -         <a href="mod/mod_imap.html">mod_imap</a><br />
  -         <a href="mod/mod_info.html">mod_info</a><br />
  -         <a href="mod/mod_mime.html">mod_mime</a><br />
  -         <a
  -        href="mod/mod_negotiation.html">mod_negotiation</a><br />
  -         <a href="mod/mod_status.html">mod_status</a><br />
  -         </td>
  -
  -        <td valign="top"><strong>Related Directives</strong><br />
  -         <br />
  -         <a href="mod/mod_actions.html#action">Action</a><br />
  -         <a
  -        href="mod/mod_mime.html#addhandler">AddHandler</a><br />
  -         <a
  -        href="mod/mod_mime.html#removehandler">RemoveHandler</a><br />
  -         <a
  -        href="mod/mod_mime.html#sethandler">SetHandler</a><br />
  -         </td>
  -      </tr>
  -    </table>
   
       <p>A "handler" is an internal Apache representation of the
       action to be performed when a file is called. Generally, files
  @@ -66,13 +20,11 @@
       can be specified without relation to file type. This is
       advantageous both because it is a more elegant solution, and
       because it also allows for both a type <strong>and</strong> a
  -    handler to be associated with a file. (See also <a
  -    href="mod/mod_mime.html#multipleext">Files with Multiple
  +    handler to be associated with a file. (See also <a href="mod/mod_mime.html#multipleext">Files with Multiple
       Extensions</a>.)</p>
   
       <p>Handlers can either be built into the server or included in
  -    a module, or they can be added with the <a
  -    href="mod/mod_actions.html#action">Action</a> directive. The
  +    a module, or they can be added with the <a href="./mod/mod_actions.html#action" class="directive"><code class="directive">Action</code></a> directive. The
       built-in handlers in the standard distribution are as
       follows:</p>
   
  @@ -82,45 +34,46 @@
         default to handle static content. (core)</li>
   
         <li><strong>send-as-is</strong>: Send file with HTTP headers
  -      as is. (<a href="mod/mod_asis.html">mod_asis</a>)</li>
  +      as is. (<code><a href="./mod/mod_asis.html">mod_asis</a></code>)</li>
   
         <li><strong>cgi-script</strong>: Treat the file as a CGI
  -      script. (<a href="mod/mod_cgi.html">mod_cgi</a>)</li>
  +      script. (<code><a href="./mod/mod_cgi.html">mod_cgi</a></code>)</li>
   
         <li><strong>imap-file</strong>: Parse as an imagemap rule
  -      file. (<a href="mod/mod_imap.html">mod_imap</a>)</li>
  +      file. (<code><a href="./mod/mod_imap.html">mod_imap</a></code>)</li>
   
         <li><strong>server-info</strong>: Get the server's
  -      configuration information. (<a
  -      href="mod/mod_info.html">mod_info</a>)</li>
  +      configuration information. (<code><a href="./mod/mod_info.html">mod_info</a></code>)</li>
   
         <li><strong>server-status</strong>: Get the server's status
  -      report. (<a href="mod/mod_status.html">mod_status</a>)</li>
  +      report. (<code><a href="./mod/mod_status.html">mod_status</a></code>)</li>
   
         <li><strong>type-map</strong>: Parse as a type map file for
  -      content negotiation. (<a
  -      href="mod/mod_negotiation.html">mod_negotiation</a>)</li>
  +      content negotiation. (<code><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>)</li>
       </ul>
  -    <hr />
  +  <h2><a name="examples">Examples</a></h2>
   
  -    <h2><a id="examples" name="examples">Examples</a></h2>
   
  -    <h3>Modifying static content using a CGI script</h3>
  +    <h3><a name="example1">Modifying static content using a CGI script</a></h3>
  +      
   
       <p>The following directives will cause requests for files with
       the <code>html</code> extension to trigger the launch of the
       <code>footer.pl</code> CGI script.</p>
  -<pre>
  -     Action add-footer /cgi-bin/footer.pl
  +      
  +      <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><code>
  +        Action add-footer /cgi-bin/footer.pl<br>
        AddHandler add-footer .html
  -</pre>
  +      </code></code></td></tr></table></blockquote>
   
       <p>Then the CGI script is responsible for sending the
       originally requested document (pointed to by the
       <code>PATH_TRANSLATED</code> environment variable) and making
       whatever modifications or additions are desired.</p>
   
  -    <h3>Files with HTTP headers</h3>
  +    
  +    <h3><a name="example2">Files with HTTP headers</a></h3>
  +      
   
       <p>The following directives will enable the
       <code>send-as-is</code> handler, which is used for files which
  @@ -128,15 +81,16 @@
       <code>/web/htdocs/asis/</code> directory will be processed by
       the <code>send-as-is</code> handler, regardless of their
       filename extensions.</p>
  -<pre>
  -    &lt;Directory /web/htdocs/asis&gt;
  -    SetHandler send-as-is
  +
  +      <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><code>
  +        &lt;Directory /web/htdocs/asis&gt;<br>
  +        SetHandler send-as-is<br>
       &lt;/Directory&gt;
  -</pre>
  -    <hr />
  +      </code></code></td></tr></table></blockquote>
  +      
  +    
  +  <h2><a name="programmer">Programmer's Note</a></h2>
   
  -    <h2><a id="programmer" name="programmer">Programmer's
  -    Note</a></h2>
   
       <p>In order to implement the handler features, an addition has
       been made to the <a href="developer/API.html">Apache API</a> that
  @@ -154,7 +108,4 @@
       type. While it is not necessary, the naming convention for
       handlers is to use a dash-separated word, with no slashes, so
       as to not invade the media type name-space.</p>
  -    <!--#include virtual="footer.html" -->
  -  </body>
  -</html>
  -
  +  </blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="./images/index.gif" alt="Index"/></a><a href="./"><img src="./images/home.gif" alt="Home"/></a></body></html>
  \ No newline at end of file
  
  
  
  1.1                  httpd-2.0/docs/manual/env.xml
  
  Index: env.xml
  ===================================================================
  <?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
  <?xml-stylesheet type="text/xsl" href="./style/manual.en.xsl"?>
  
  <manualpage>
    <relativepath href="."/>
  
    <title>Environment Variables in Apache</title>
  
    <summary>
      <p>The Apache HTTP Server provides a mechanism for storing
      information in named variables that are called <em>environment
      variables</em>. This information can be used to control various
      operations such as logging or access control. The variables are
      also used as a mechanism to communicate with external programs
      such as CGI scripts. This document discusses different ways to
      manipulate and use these variables.</p>
          
      <p>Although these variables are referred to as <em>environment
      variables</em>, they are not the same as the environment
      variables controlled by the underlying operating system.
      Instead, these variables are stored and manipulated in an
      internal Apache structure. They only become actual operating
      system environment variables when they are provided to CGI
      scripts and Server Side Include scripts. If you wish to
      manipulate the operating system environment under which the
      server itself runs, you must use the standard environment
      manipulation mechanisms provided by your operating system
      shell.</p>
    </summary>
  
    <section id="setting">
      <title>Setting Environment Variables</title>
      <related>
        <modulelist>
          <module>mod_env</module>
          <module>mod_rewrite</module>
          <module>mod_setenvif</module>
          <module>mod_unique_id</module>
        </modulelist>
        <directivelist>
          <directive module="mod_setenvif">BrowserMatch</directive>
          <directive module="mod_setenvif">BrowserMatchNoCase</directive>
          <directive module="mod_env">PassEnv</directive>
          <directive module="mod_rewrite">RewriteRule</directive>
          <directive module="mod_env">SetEnv</directive>
          <directive module="mod_setenvif">SetEnvIf</directive>
          <directive module="mod_setenvif">SetEnvIfNoCase</directive>
          <directive module="mod_env.html">UnsetEnv</directive>
        </directivelist>
      </related>
      
      <section id="basic-manipulation">
          <title>Basic Environment Manipulation</title>
      
          <p>The most basic way to set an environment variable in Apache
          is using the unconditional <directive module="mod_env"
          >SetEnv</directive> directive. Variables may also be passed from
          the environment of the shell which started the server using the
          <directive module="mod_env">PassEnv</directive> directive.</p>
      
      </section>
      <section id="conditional">
          <title>Conditional Per-Request Settings</title>
      
          <p>For additional flexibility, the directives provided by
          mod_setenvif allow environment variables to be set on a
          per-request basis, conditional on characteristics of particular
          requests. For example, a variable could be set only when a
          specific browser (User-Agent) is making a request, or only when
          a specific Referer [sic] header is found. Even more flexibility
          is available through the mod_rewrite's <directive 
          module="mod_rewrite">RewriteRule</directive> which uses the 
          <code>[E=...]</code> option to set environment variables.</p>
      
      </section>
      <section id="unique-identifiers">
          <title>Unique Identifiers</title>
      
          <p>Finally, mod_unique_id sets the environment variable
          <code>UNIQUE_ID</code> for each request to a value which is
          guaranteed to be unique across "all" requests under very
          specific conditions.</p>
      
      </section>
      <section id="standard-cgi">
          <title>Standard CGI Variables</title>
      
          <p>In addition to all environment variables set within the
          Apache configuration and passed from the shell, CGI scripts and
          SSI pages are provided with a set of environment variables
          containing meta-information about the request as required by
          the <a href="http://cgi-spec.golux.com/">CGI
          specification</a>.</p>
      
      </section>
      <section id="caveats">
          <title>Some Caveats</title>
      
          <ul>
            <li>It is not possible to override or change the standard CGI
            variables using the environment manipulation directives.</li>
      
            <li>When <a href="suexec.html">suexec</a> is used to launch
            CGI scripts, the environment will be cleaned down to a set of
            <em>safe</em> variables before CGI scripts are launched. The
            list of <em>safe</em> variables is defined at compile-time in
            <code>suexec.c</code>.</li>
      
            <li>For portability reasons, the names of environment
            variables may contain only letters, numbers, and the
            underscore character. In addition, the first character may
            not be a number. Characters which do not match this
            restriction will be replaced by an underscore when passed to
            CGI scripts and SSI pages.</li>
          </ul>
      </section>
    </section>
    <section id="using">
      <title>Using Environment Variables</title>
      
      <related>
        <modulelist>
          <module>mod_access</module>
          <module>mod_cgi</module>
          <module>mod_headers</module>
          <module>mod_include</module>
          <module>mod_log_config</module>
          <module>mod_rewrite</module>
        </modulelist>
        <directivelist>
          <directive module="mod_access">Allow</directive>
          <directive module="mod_log_config">CustomLog</directive>
          <directive module="mod_access">Deny</directive>
          <directive module="mod_headers">Header</directive>
          <directive module="mod_log_config">LogFormat</directive>
          <directive module="mod_rewrite">RewriteCond</directive>
          <directive module="mod_rewrite">RewriteRule</directive>
        </directivelist>
      </related>
  
      <section id="cgi-scripts">
          <title>CGI Scripts</title>
      
          <p>One of the primary uses of environment variables is to
          communicate information to CGI scripts. As discussed above, the
          environment passed to CGI scripts includes standard
          meta-information about the request in addition to any variables
          set within the Apache configuration. For more details, see the
          <a href="howto/cgi.html">CGI tutorial</a>.</p>
      
      </section>
      <section id="ssi-pages">
          <title>SSI Pages</title>
      
          <p>Server-parsed (SSI) documents processed by mod_include's
          <code>INCLUDES</code> filter can print environment variables
          using the <code>echo</code> element, and can use environment
          variables in flow control elements to makes parts of a page
          conditional on characteristics of a request. Apache also
          provides SSI pages with the standard CGI environment variables
          as discussed above. For more details, see the <a
          href="howto/ssi.html">SSI tutorial</a>.</p>
      
      </section>
      <section id="access-control">
          <title>Access Control</title>
      
          <p>Access to the server can be controlled based on the value of
          environment variables using the <code>allow from env=</code>
          and <code>deny from env=</code> directives. In combination with
          <directive module="mod_setenvif">SetEnvIf</directive>, this 
          allows for flexible control of access to the server based on 
          characteristics of the client. For example, you can use these 
          directives to deny access to a particular browser (User-Agent).
          </p>
      
      </section>
      <section id="logging">
          <title>Conditional Logging</title>
      
          <p>Environment variables can be logged in the access log using
          the <directive module="mod_log_config">LogFormat</directive>
          option <code>%e</code>. In addition, the decision on whether
          or not to log requests can be made based on the status of 
          environment variables using the conditional form of the 
          <directive module="mod_log_config">CustomLog</directive>
          directive. In combination with <directive module="mod_setenvif"
          >SetEnvIf</directive> this allows for flexible control of which 
          requests are logged. For example, you can choose not to log 
          requests for filenames ending in <code>gif</code>, or you can
          choose to only log requests from clients which are outside your
          subnet.</p>
      
      </section>
      <section id="response-headers">
          <title>Conditional Response Headers</title>
      
          <p>The <directive module="mod_headers">Header</directive>
          directive can use the presence or
          absence of an environment variable to determine whether or not
          a certain HTTP header will be placed in the response to the
          client. This allows, for example, a certain response header to
          be sent only if a corresponding header is received in the
          request from the client.</p>
      
      </section>
      <section id="url-rewriting">
          <title>URL Rewriting</title>
      
          <p>The <code>%{ENV:...}</code> form of <em>TestString</em> in
          the <directive module="mod_rewrite">RewriteCond</directive>
          allows mod_rewrite's rewrite
          engine to make decisions conditional on environment variables.
          Note that the variables accessible in mod_rewrite without the
          <code>ENV:</code> prefix are not actually environment
          variables. Rather, they are variables special to mod_rewrite
          which cannot be accessed from other modules.</p>
      </section>
    </section>
      
    <section id="special">
      <title>Special Purpose Environment Variables</title>
      
          <p>Interoperability problems have led to the introduction of
          mechanisms to modify the way Apache behaves when talking to
          particular clients. To make these mechanisms as flexible as
          possible, they are invoked by defining environment variables,
          typically with <directive module="mod_setenvif">BrowserMatch</directive>,
          though <directive module="mod_env">SetEnv</directive> and 
          <directive module="mod_env">PassEnv</directive> could also be used,
          for example.</p>
      
      <section id="downgrade">
          <title>downgrade-1.0</title>
      
          <p>This forces the request to be treated as a HTTP/1.0 request
          even if it was in a later dialect.</p>
      
      </section>
      <section id="force-no-vary">
          <title>force-no-vary</title>
      
          <p>This causes any <code>Vary</code> fields to be removed from
          the response header before it is sent back to the client. Some
          clients don't interpret this field correctly (see the <a
          href="misc/known_client_problems.html">known client
          problems</a> page); setting this variable can work around this
          problem. Setting this variable also implies
          <strong>force-response-1.0</strong>.</p>
      
      </section>
      <section id="force-response">
          <title>force-response-1.0</title>
      
          <p>This forces an HTTP/1.0 response when set. It was originally
          implemented as a result of a problem with AOL's proxies. Some
          clients may not behave correctly when given an HTTP/1.1
          response, and this can be used to interoperate with them.</p>
      
      </section>
      <section id="nokeepalive">
          <title>nokeepalive</title>
      
          <p>This disables <directive module="core">KeepAlive</directive> when set.</p>
      
      </section>
      <section id="redirect-carefully">
          <title>redirect-carefully</title>
      
          <p>This forces the server to be more careful when sending a redirect
          to the client.  This is typically used when a client has a known
          problem handling redirects.  This was originally implemented as a
          result of a problem with Microsoft's WebFolders software which has
          a problem handling redirects on directory resources via DAV 
          methods.</p>
      
      </section>
    </section>
  
    <section id="examples">
      <title>Examples</title>
      
      <section id="misbehaving">
          <title>Changing protocol behavior with misbehaving clients</title>
      
          <p>We recommend that the following lines be included in
          httpd.conf to deal with known client problems.</p>
  <example><pre>
  #
  # The following directives modify normal HTTP response behavior.
  # The first directive disables keepalive for Netscape 2.x and browsers that
  # spoof it. There are known problems with these browser implementations.
  # The second directive is for Microsoft Internet Explorer 4.0b2
  # which has a broken HTTP/1.1 implementation and does not properly
  # support keepalive when it is used on 301 or 302 (redirect) responses.
  #
  BrowserMatch "Mozilla/2" nokeepalive
  BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0
  
  #
  # The following directive disables HTTP/1.1 responses to browsers which
  # are in violation of the HTTP/1.0 spec by not being able to grok a
  # basic 1.1 response.
  #
  BrowserMatch "RealPlayer 4\.0" force-response-1.0
  BrowserMatch "Java/1\.0" force-response-1.0
  BrowserMatch "JDK/1\.0" force-response-1.0</pre></example>
  
      </section>
      <section id="no-img-log">
          <title>Do not log requests for images in the access log</title>
      
          <p>This example keeps requests for images from appearing in the
          access log. It can be easily modified to prevent logging of
          particular directories, or to prevent logging of requests
          coming from particular hosts.</p>
      <example><pre>
  SetEnvIf Request_URI \.gif image-request
  SetEnvIf Request_URI \.jpg image-request
  SetEnvIf Request_URI \.png image-request
  CustomLog logs/access_log common env=!image-request</pre></example>
      
      </section>
      <section id="image-theft">
          <title>Prevent "Image Theft"</title>
      
          <p>This example shows how to keep people not on your server
          from using images on your server as inline-images on their
          pages. This is not a recommended configuration, but it can work
          in limited circumstances. We assume that all your images are in
          a directory called /web/images.</p>
      <example><pre>
  SetEnvIf Referer "^http://www.example.com/" local_referal
  # Allow browsers that do not send Referer info
  SetEnvIf Referer "^$" local_referal
  &lt;Directory /web/images&gt;
     Order Deny,Allow
     Deny from all
     Allow from env=local_referal
  &lt;/Directory&gt;</pre></example>
      
          <p>For more information about this technique, see the
          ApacheToday tutorial " <a
          href="http://apachetoday.com/news_story.php3?ltsn=2000-06-14-002-01-PS">
      Keeping Your Images from Adorning Other Sites</a>".</p>
      </section>
    </section>
  </manualpage>
  
  
  
  
  
  
  
  1.1                  httpd-2.0/docs/manual/filter.xml
  
  Index: filter.xml
  ===================================================================
  <?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
  <?xml-stylesheet type="text/xsl" href="./style/manual.en.xsl"?>
  
  <manualpage>
    <relativepath href="."/>
  
    <title>Filters</title>
  
    <summary>
      <p>This document describes the use of filters in Apache.</p>
    </summary>
  
    <section id="filters">
      <title>Filters</title>
      <related>
        <modulelist>
          <module>mod_deflate</module>
          <module>mod_ext_filter</module>
          <module>mod_include</module>
        </modulelist>
        <directivelist>
          <directive module="mod_mime">AddInputFilter</directive>
          <directive module="mod_mime">AddOutputFilter</directive>
          <directive module="mod_ext_filter">ExtFilterDefine</directive>
          <directive module="mod_ext_filter">ExtFilterOptions</directive>
          <directive module="core.html">SetInputFilter</directive>
          <directive module="core.html">SetOutputFilter</directive>
        </directivelist>
      </related>
      
      <p>A <em>filter</em> is a process that is applied to data that
      is sent or received by the server. Data sent by clients to the
      server is processed by <em>input filters</em> while data sent
      by the server to the client is processed by <em>output
      filters</em>. Multiple filters can be applied to the data, and
      the order of the filters can be explicitly specified.</p>
  
      <p>Filters are used internally by Apache to perform functions such
      as chunking and byte-range request handling. In addition, modules
      can provide filters that are selectable using run-time
      configuration directives. The set of filters that apply to data
      can be manipulated with the <directive module="core.html"
      >SetInputFilter</directive>, <directive module="core.html"
      >SetOutputFilter</directive>, <directive module="mod_mime"
      >AddInputFilter</directive>, and <directive module="mod_mime"
      >AddOutputFilter</directive> directives.</p>
  
      <p>The following user-selectable filters are currently provided
      with the Apache HTTP Server distribution.</p>
  
      <dl>
        <dt>INCLUDES</dt>
        <dd>Server-Side Includes processing by <module>mod_include</module></dd>
        <dt>DEFLATE</dt>
        <dd>Compress output before sending it to the client using <module
        >mod_include</module></dd>
      </dl>
  
      <p>In addition, the module <module>mod_ext_filter</module> allows
      for external programs to be defined as filters.</p>
    </section>
  </manualpage>
  
  
  
  
  
  
  
  1.1                  httpd-2.0/docs/manual/handler.xml
  
  Index: handler.xml
  ===================================================================
  <?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
  <?xml-stylesheet type="text/xsl" href="./style/manual.en.xsl"?>
  
  <manualpage>
    <relativepath href="."/>
  
    <title>Apache's Handler Use</title>
  
    <summary>
      <p>This document describes the use of Apache's Handlers.</p>
    </summary>
  
    <section id="definition">
      <title>What is a Handler</title>
      <related>
        <modulelist>
          <module>mod_actions</module>
          <module>mod_asis</module>
          <module>mod_cgi</module>
          <module>mod_imap</module>
          <module>mod_info</module>
          <module>mod_mime</module>
          <module>mod_negotiation</module>
          <module>mod_status</module>
       </modulelist>
        <directivelist>
          <directive module="mod_actions">Action</directive>
          <directive module="mod_mime">AddHandler</directive>
          <directive module="mod_mime">RemoveHandler</directive>
          <directive module="mod_mime">SetHandler</directive>
        </directivelist>
      </related>
      
  
      <p>A "handler" is an internal Apache representation of the
      action to be performed when a file is called. Generally, files
      have implicit handlers, based on the file type. Normally, all
      files are simply served by the server, but certain file types
      are "handled" separately.</p>
  
      <p>Apache 1.1 adds the ability to use handlers explicitly.
      Based on either filename extensions or on location, handlers
      can be specified without relation to file type. This is
      advantageous both because it is a more elegant solution, and
      because it also allows for both a type <strong>and</strong> a
      handler to be associated with a file. (See also <a
      href="mod/mod_mime.html#multipleext">Files with Multiple
      Extensions</a>.)</p>
  
      <p>Handlers can either be built into the server or included in
      a module, or they can be added with the <directive 
      module="mod_actions">Action</directive> directive. The
      built-in handlers in the standard distribution are as
      follows:</p>
  
      <ul>
        <li><strong>default-handler</strong>: Send the file using the
        <code>default_handler()</code>, which is the handler used by
        default to handle static content. (core)</li>
  
        <li><strong>send-as-is</strong>: Send file with HTTP headers
        as is. (<module>mod_asis</module>)</li>
  
        <li><strong>cgi-script</strong>: Treat the file as a CGI
        script. (<module>mod_cgi</module>)</li>
  
        <li><strong>imap-file</strong>: Parse as an imagemap rule
        file. (<module>mod_imap</module>)</li>
  
        <li><strong>server-info</strong>: Get the server's
        configuration information. (<module>mod_info</module>)</li>
  
        <li><strong>server-status</strong>: Get the server's status
        report. (<module>mod_status</module>)</li>
  
        <li><strong>type-map</strong>: Parse as a type map file for
        content negotiation. (<module>mod_negotiation</module>)</li>
      </ul>
    </section>
    <section id="examples">
      <title>Examples</title>
  
      <section id="example1">
        <title>Modifying static content using a CGI script</title>
  
        <p>The following directives will cause requests for files with
        the <code>html</code> extension to trigger the launch of the
        <code>footer.pl</code> CGI script.</p>
        
        <example><code>
          Action add-footer /cgi-bin/footer.pl<br/>
          AddHandler add-footer .html
        </code></example>
  
        <p>Then the CGI script is responsible for sending the
        originally requested document (pointed to by the
        <code>PATH_TRANSLATED</code> environment variable) and making
        whatever modifications or additions are desired.</p>
   
      </section>
      <section id="example2">
        <title>Files with HTTP headers</title>
  
        <p>The following directives will enable the
        <code>send-as-is</code> handler, which is used for files which
        contain their own HTTP headers. All files in the
        <code>/web/htdocs/asis/</code> directory will be processed by
        the <code>send-as-is</code> handler, regardless of their
        filename extensions.</p>
  
        <example><code>
          &lt;Directory /web/htdocs/asis&gt;<br/>
          SetHandler send-as-is<br/>
          &lt;/Directory&gt;
        </code></example>
        
      </section>
    </section>
    <section id="programmer">
      <title>Programmer's Note</title>
  
      <p>In order to implement the handler features, an addition has
      been made to the <a href="developer/API.html">Apache API</a> that
      you may wish to make use of. Specifically, a new record has
      been added to the <code>request_rec</code> structure:</p>
  <pre>
      char *handler
  </pre>
  
      <p>If you wish to have your module engage a handler, you need
      only to set <code>r-&gt;handler</code> to the name of the
      handler at any time prior to the <code>invoke_handler</code>
      stage of the request. Handlers are implemented as they were
      before, albeit using the handler name instead of a content
      type. While it is not necessary, the naming convention for
      handlers is to use a dash-separated word, with no slashes, so
      as to not invade the media type name-space.</p>
    </section>
  </manualpage>
  
  
  
  
  
  
  
  

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