mod_setenvif.html.en

Apache官方在今天放出产品系列2.2的最新版本2.2.11的源码包 最流行的HTTP服务器软件之一

    things:</p>

<ol>
<li>An HTTP request header field (see <a href="http://www.rfc-editor.org/rfc/rfc2616.txt">RFC2616</a>
    for more information about these); for example: <code>Host</code>,
    <code>User-Agent</code>, <code>Referer</code>, and 
    <code>Accept-Language</code>.  A regular expression may be
    used to specify a set of request headers.</li>

<li>One of the following aspects of the request:
    <ul>
      <li><code>Remote_Host</code> - the hostname (if available) of
      the client making the request</li>

      <li><code>Remote_Addr</code> - the IP address of the client
      making the request</li>

      <li><code>Server_Addr</code> - the IP address of the server
      on which the request was received (only with versions later
      than 2.0.43)</li>

      <li><code>Request_Method</code> - the name of the method
      being used (<code>GET</code>, <code>POST</code>, <em>et
      cetera</em>)</li>

      <li><code>Request_Protocol</code> - the name and version of
      the protocol with which the request was made (<em>e.g.</em>,
      "HTTP/0.9", "HTTP/1.1", <em>etc.</em>)</li>

      <li><code>Request_URI</code> - the resource requested on the HTTP
       request line -- generally the portion of the URL
      following the scheme and host portion without the query string. See
      the <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>
      directive of <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> for extra information on
      how to match your query string.</li>
    </ul>
</li>

<li>The name of an environment variable in the list of those
associated with the request. This allows
<code class="directive">SetEnvIf</code> directives to test against the result
of prior matches. Only those environment variables defined by earlier
<code>SetEnvIf[NoCase]</code> directives are available for testing in
this manner. 'Earlier' means that they were defined at a broader scope
(such as server-wide) or previously in the current directive's scope.
Environment variables will be considered only if there was no match
among request characteristics and a regular expression was not
used for the <em>attribute</em>.</li>
</ol>

<p>The second argument (<em>regex</em>) is a <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a>.  If the <em>regex</em>
matches against the <em>attribute</em>, then the remainder of the
arguments are evaluated.</p>

<p>The rest of the arguments give the names of variables to set, and
optionally values to which they should be set. These take the form
of</p>

    <ol>
      <li><code><em>varname</em></code>, or</li>

      <li><code>!<em>varname</em></code>, or</li>

      <li><code><em>varname</em>=<em>value</em></code></li>
    </ol>

    <p>In the first form, the value will be set to "1". The second
    will remove the given variable if already defined, and the
    third will set the variable to the literal value given by
    <code><em>value</em></code>. Since version 2.0.51 Apache will
    recognize occurrences of <code>$1</code>..<code>$9</code> within
    <var>value</var> and replace them by parenthesized subexpressions
    of <var>regex</var>.</p>

<div class="example"><h3>Example:</h3><p><code>

   SetEnvIf Request_URI "\.gif$" object_is_image=gif<br />
   SetEnvIf Request_URI "\.jpg$" object_is_image=jpg<br />
   SetEnvIf Request_URI "\.xbm$" object_is_image=xbm<br />
        :<br />
   SetEnvIf Referer www\.mydomain\.example\.com intra_site_referral<br />
        :<br />
   SetEnvIf object_is_image xbm XBIT_PROCESSING=1<br />
        :<br />
   SetEnvIf ^TS*  ^[a-z].*  HAVE_TS<br />
</code></p></div>

    <p>The first three will set the environment variable
    <code>object_is_image</code> if the request was for an image
    file, and the fourth sets <code>intra_site_referral</code> if
    the referring page was somewhere on the
    <code>www.mydomain.example.com</code> Web site.</p>

    <p>The last example will set environment variable
    <code>HAVE_TS</code> if the request contains any headers that
    begin with "TS" whose values begins with any character in the
    set [a-z].</p>

<h3>See also</h3>
<ul>
<li><a href="../env.html">Environment Variables in Apache</a>,
for additional examples.
</li>
</ul>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="SetEnvIfNoCase" id="SetEnvIfNoCase">SetEnvIfNoCase</a> <a name="setenvifnocase" id="setenvifnocase">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
without respect to case</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIfNoCase <em>attribute regex 
        [!]env-variable</em>[=<em>value</em>]
    [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Apache 1.3 and above</td></tr>
</table>

    <p>The <code class="directive">SetEnvIfNoCase</code> is semantically identical to
    the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive,
    and differs only in that the regular expression matching is
    performed in a case-insensitive manner. For example:</p>
<div class="example"><p><code>
   SetEnvIfNoCase Host Apache\.Org site=apache
</code></p></div>

    <p>This will cause the <code>site</code> environment variable
    to be set to "<code>apache</code>" if the HTTP request header
    field <code>Host:</code> was included and contained
    <code>Apache.Org</code>, <code>apache.org</code>, or any other
    combination.</p>

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