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-<TITLE>Special Purpose Environment Variables</TITLE>
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-<h1 align="center">Environment Variables in Apache</h1>
+URI: env.html.en
+Content-Language: en
+Content-type: text/html; charset=ISO-8859-1
-<p>Many operating systems provide a facility for storage and
-transmission of information called environment variables. Apache uses
-environment variables in many ways to control operations and to
-communicate with other programs like CGI scripts. This document
-explains some of the ways to use environment variables in Apache.</p>
+URI: env.html.fr.utf8
+Content-Language: fr
+Content-type: text/html; charset=UTF-8
-<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>
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+Content-Language: ja
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-<hr>
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+Content-type: text/html; charset=EUC-KR
-<h2><a name="setting">Setting Environment Variables</a></h2>
-
-<h3>Related Modules</h3>
-
-<ul>
-<li><a href="mod/mod_env.html">mod_env</a></li>
-<li><a href="mod/mod_rewrite.html">mod_rewrite</a></li>
-<li><a href="mod/mod_setenvif.html">mod_setenvif</a></li>
-<li><a href="mod/mod_unique_id.html">mod_unique_id</a></li>
-</ul>
-
-<h3>Related Directives</h3>
-
-<ul>
-<li><A HREF="mod/mod_setenvif.html#BrowserMatch">BrowserMatch</A></li>
-<li><A HREF="mod/mod_setenvif.html#BrowserMatchNoCase">BrowserMatchNoCase</A></li>
-<li><A HREF="mod/mod_env.html#passenv">PassEnv</A></li>
-<li><A HREF="mod/mod_rewrite.html#RewriteRule">RewriteRule</A></li>
-<li><A HREF="mod/mod_env.html#setenv">SetEnv</A></li>
-<li><A HREF="mod/mod_setenvif.html#SetEnvIf">SetEnvIf</A></li>
-<li><A HREF="mod/mod_setenvif.html#SetEnvIfNoCase">SetEnvIfNoCase</A></li>
-<li><A HREF="mod/mod_env.html#unsetenv">UnsetEnv</A></li>
-</ul>
-
-<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 when Apache is started
-using the <code>PassEnv</code> directive.</p>
-
-<p>The directives provided by mod_setenvif allow environment variables
-to be set on a per-request basis based 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 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>
-
-<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>
-
-<hr>
-
-<h2><a name="using">Using Environment Variables</a></h2>
-
-<h3>Related Modules</h3>
-
-<ul>
-<li><a href="mod/mod_access.html">mod_access</a></li>
-<li><a href="mod/mod_cgi.html">mod_cgi</a></li>
-<li><a href="mod/mod_include.html">mod_include</a></li>
-<li><a href="mod/mod_log_config.html">mod_log_config</a></li>
-<li><a href="mod/mod_rewrite.html">mod_rewrite</a></li>
-</ul>
-
-<h3>Related Directives</h3>
-
-<ul>
-<LI><A HREF="mod/mod_access.html#allowfromenv">Allow from env=</A></li>
-<li><a href="mod/mod_log_config.html#customlog-conditional">CustomLog
-(conditional)</a></li>
-<LI><A HREF="mod/mod_access.html#denyfromenv">Deny from env=</A></li>
-<li><a href="mod/mod_log_config.html#logformat">LogFormat</a></li>
-<LI><A HREF="mod/mod_rewrite.html#RewriteCond">RewriteCond</A></li>
-<LI><A HREF="mod/mod_rewrite.html#RewriteRule">RewriteRule</A></li>
-</ul>
-
-
-<p>One of the primary uses of environment variables is to communicate
-information to CGI scripts. In addition to all environment variables
-set within Apache, CGI scripts are provided with a set of
-meta-information about the request as provided for in the <a
-href="misc/FAQ.html#cgi-spec">CGI specification</a>. If you are using
-<a href="suexec.html">Suexec</a> to execute CGI scripts under
-different userids, note that the environment will be cleaned down to a
-set of <em>safe</em> environment variables before the CGI script is
-executed. The set of safe environment variables is defined at
-compile time in <code>suexec.c</code>.
-</p>
-
-<p>Server-parsed (SSI) documents processed by mod_include's
-<code>server-parsed</code> handler can print environment variables
-using the <code>echo</code> element, and can use environment variables
-in flow control elements.
-</p>
-
-<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></a> 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>
-
-<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>
-
-<p>The <code>%{ENV:...}</code> form of <em>TestString</em> in the
-<code>RewriteCond</code> allows mod_rewrite's rewrite engine to make
-decisions conditional on environment variables.
-
-<hr>
-
-<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_browser.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, for
-example.
-</P>
-
-<H2>downgrade-1.0</H2>
-<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>
-<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>
-
-<H2>force-response-1.0</H2>
-<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>
-
-
-<hr>
-
-<h2><a name="examples">Examples</a></h2>
-
-<h3>Changing protocol behavior with misbehaving clients</h3>
-
-<p>We recommend that the following lines be included in httpd.conf
-to deal with known client problems.</p>
-
-<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>
-
-<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 env=!image-request
-</pre>
-
-<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
- <Directory /web/images>
- Order Deny,Allow
- Deny from all
- Allow from env=local_referal
- </Directory>
-</pre>
-
-<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>
-
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-</BODY>
-</HTML>
+URI: env.html.tr.utf8
+Content-Language: tr
+Content-type: text/html; charset=UTF-8
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