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25 <div id="preamble"><h1>Apache Module mod_setenvif</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_setenvif.html" title="English"> en </a> |
28 <a href="../fr/mod/mod_setenvif.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
29 <a href="../ja/mod/mod_setenvif.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
30 <a href="../ko/mod/mod_setenvif.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
31 <a href="../tr/mod/mod_setenvif.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
33 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Allows the setting of environment variables based
34 on characteristics of the request</td></tr>
35 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
36 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>setenvif_module</td></tr>
37 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_setenvif.c</td></tr></table>
41 <p>The <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> module allows you to set
42 internal environment variables according to whether different aspects of
43 the request match regular expressions you specify. These
44 environment variables can be used by other parts of the server
45 to make decisions about actions to be taken, as well as becoming
46 available to CGI scripts and SSI pages.</p>
48 <p>The directives are considered in the order they appear in
49 the configuration files. So more complex sequences can be used,
50 such as this example, which sets <code>netscape</code> if the
51 browser is mozilla but not MSIE.</p>
53 <pre class="prettyprint lang-config">
54 BrowserMatch ^Mozilla netscape
55 BrowserMatch MSIE !netscape
59 <div id="quickview"><h3 class="directives">Directives</h3>
61 <li><img alt="" src="../images/down.gif" /> <a href="#browsermatch">BrowserMatch</a></li>
62 <li><img alt="" src="../images/down.gif" /> <a href="#browsermatchnocase">BrowserMatchNoCase</a></li>
63 <li><img alt="" src="../images/down.gif" /> <a href="#setenvif">SetEnvIf</a></li>
64 <li><img alt="" src="../images/down.gif" /> <a href="#setenvifexpr">SetEnvIfExpr</a></li>
65 <li><img alt="" src="../images/down.gif" /> <a href="#setenvifnocase">SetEnvIfNoCase</a></li>
69 <li><a href="../env.html">Environment Variables in Apache HTTP Server</a></li>
70 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
72 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
73 <div class="directive-section"><h2><a name="BrowserMatch" id="BrowserMatch">BrowserMatch</a> <a name="browsermatch" id="browsermatch">Directive</a></h2>
74 <table class="directive">
75 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on HTTP User-Agent
77 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatch <em>regex [!]env-variable</em>[=<em>value</em>]
78 [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
79 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
80 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
81 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
82 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
84 <p>The <code class="directive">BrowserMatch</code> is a special cases of the
85 <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive that
86 sets environment variables conditional on the
87 <code>User-Agent</code> HTTP request header. The following two
88 lines have the same effect:</p>
89 <pre class="prettyprint lang-config">
90 BrowserMatchNoCase Robot is_a_robot
91 SetEnvIfNoCase User-Agent Robot is_a_robot
95 <p>Some additional examples:</p>
96 <pre class="prettyprint lang-config">
97 BrowserMatch ^Mozilla forms jpeg=yes browser=netscape
98 BrowserMatch "^Mozilla/[2-3]" tables agif frames javascript
99 BrowserMatch MSIE !javascript
104 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
105 <div class="directive-section"><h2><a name="BrowserMatchNoCase" id="BrowserMatchNoCase">BrowserMatchNoCase</a> <a name="browsermatchnocase" id="browsermatchnocase">Directive</a></h2>
106 <table class="directive">
107 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on User-Agent without
108 respect to case</td></tr>
109 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatchNoCase <em>regex [!]env-variable</em>[=<em>value</em>]
110 [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
111 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
112 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
113 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
114 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
117 <p>The <code class="directive">BrowserMatchNoCase</code> directive is
118 semantically identical to the <code class="directive"><a href="#browsermatch">BrowserMatch</a></code> directive.
119 However, it provides for case-insensitive matching. For
121 <pre class="prettyprint lang-config">
122 BrowserMatchNoCase mac platform=macintosh
123 BrowserMatchNoCase win platform=windows
127 <p>The <code class="directive">BrowserMatch</code> and
128 <code class="directive">BrowserMatchNoCase</code> directives are special cases of
129 the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> and <code class="directive"><a href="#setenvifnocase">SetEnvIfNoCase</a></code>
130 directives. The following two lines have the same effect:</p>
131 <pre class="prettyprint lang-config">
132 BrowserMatchNoCase Robot is_a_robot
133 SetEnvIfNoCase User-Agent Robot is_a_robot
138 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
139 <div class="directive-section"><h2><a name="SetEnvIf" id="SetEnvIf">SetEnvIf</a> <a name="setenvif" id="setenvif">Directive</a></h2>
140 <table class="directive">
141 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
143 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIf <em>attribute
144 regex [!]env-variable</em>[=<em>value</em>]
145 [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
146 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
147 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
148 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
149 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
151 <p>The <code class="directive">SetEnvIf</code> directive defines
152 environment variables based on attributes of the request. The
153 <em>attribute</em> specified in the first argument can be one of four
157 <li>An HTTP request header field (see <a href="http://www.rfc-editor.org/rfc/rfc2616.txt">RFC2616</a>
158 for more information about these); for example: <code>Host</code>,
159 <code>User-Agent</code>, <code>Referer</code>, and
160 <code>Accept-Language</code>. A regular expression may be
161 used to specify a set of request headers.</li>
163 <li>One of the following aspects of the request:
165 <li><code>Remote_Host</code> - the hostname (if available) of
166 the client making the request</li>
168 <li><code>Remote_Addr</code> - the IP address of the client
169 making the request</li>
171 <li><code>Server_Addr</code> - the IP address of the server
172 on which the request was received (only with versions later
175 <li><code>Request_Method</code> - the name of the method
176 being used (<code>GET</code>, <code>POST</code>, <em>et
179 <li><code>Request_Protocol</code> - the name and version of
180 the protocol with which the request was made (<em>e.g.</em>,
181 "HTTP/0.9", "HTTP/1.1", <em>etc.</em>)</li>
183 <li><code>Request_URI</code> - the resource requested on the HTTP
184 request line -- generally the portion of the URL
185 following the scheme and host portion without the query string. See
186 the <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>
187 directive of <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> for extra information on
188 how to match your query string.</li>
192 <li>The name of an environment variable in the list of those
193 associated with the request. This allows
194 <code class="directive">SetEnvIf</code> directives to test against the result
195 of prior matches. Only those environment variables defined by earlier
196 <code>SetEnvIf[NoCase]</code> directives are available for testing in
197 this manner. 'Earlier' means that they were defined at a broader scope
198 (such as server-wide) or previously in the current directive's scope.
199 Environment variables will be considered only if there was no match
200 among request characteristics and a regular expression was not
201 used for the <em>attribute</em>.</li>
205 <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>
206 matches against the <em>attribute</em>, then the remainder of the
207 arguments are evaluated.</p>
209 <p>The rest of the arguments give the names of variables to set, and
210 optionally values to which they should be set. These take the form
214 <li><code><em>varname</em></code>, or</li>
216 <li><code>!<em>varname</em></code>, or</li>
218 <li><code><em>varname</em>=<em>value</em></code></li>
221 <p>In the first form, the value will be set to "1". The second
222 will remove the given variable if already defined, and the
223 third will set the variable to the literal value given by
224 <code><em>value</em></code>. Since version 2.0.51, Apache httpd will
225 recognize occurrences of <code>$1</code>..<code>$9</code> within
226 <var>value</var> and replace them by parenthesized subexpressions
227 of <var>regex</var>.</p>
229 <pre class="prettyprint lang-config">
230 SetEnvIf Request_URI "\.gif$" object_is_image=gif
231 SetEnvIf Request_URI "\.jpg$" object_is_image=jpg
232 SetEnvIf Request_URI "\.xbm$" object_is_image=xbm
234 SetEnvIf Referer www\.mydomain\.example\.com intra_site_referral
236 SetEnvIf object_is_image xbm XBIT_PROCESSING=1
238 SetEnvIf ^TS ^[a-z] HAVE_TS
242 <p>The first three will set the environment variable
243 <code>object_is_image</code> if the request was for an image
244 file, and the fourth sets <code>intra_site_referral</code> if
245 the referring page was somewhere on the
246 <code>www.mydomain.example.com</code> Web site.</p>
248 <p>The last example will set environment variable
249 <code>HAVE_TS</code> if the request contains any headers that
250 begin with "TS" whose values begins with any character in the
255 <li><a href="../env.html">Environment Variables in Apache HTTP Server</a>,
256 for additional examples.
260 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
261 <div class="directive-section"><h2><a name="SetEnvIfExpr" id="SetEnvIfExpr">SetEnvIfExpr</a> <a name="setenvifexpr" id="setenvifexpr">Directive</a></h2>
262 <table class="directive">
263 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on an ap_expr expression</td></tr>
264 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIfExpr <em>expr
265 [!]env-variable</em>[=<em>value</em>]
266 [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
267 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
268 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
269 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
270 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
272 <p>The <code class="directive">SetEnvIfExpr</code> directive defines
273 environment variables based on an <code class="directive"><If></code>
274 <code>ap_expr</code>. These expressions will be evaluated at runtime,
275 and applied <em>env-variable</em> in the same fashion as <code class="directive">SetEnvIf</code>.</p>
277 <pre class="prettyprint lang-config">
278 SetEnvIfExpr "tolower(req('X-Sendfile')) == 'd:\images\very_big.iso')" iso_delivered
282 <p>This would set the environment variable <code>iso_delivered</code>
283 every time our application attempts to send it via <code>X-Sendfile</code></p>
285 <p>A more useful example would be to set the variable rfc1918 if the
286 remote IP address is a private address according to RFC 1918:</p>
288 <pre class="prettyprint lang-config">
289 SetEnvIfExpr "-R '10.0.0.0/8' || -R '172.16.0.0/12' || -R '192.168.0.0/16'" rfc1918
295 <li><a href="../expr.html">Expressions in Apache HTTP Server</a>,
296 for a complete reference and more examples.</li>
297 <li><code class="directive"><If></code> can be used to achieve similar
299 <li><code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code></li>
302 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
303 <div class="directive-section"><h2><a name="SetEnvIfNoCase" id="SetEnvIfNoCase">SetEnvIfNoCase</a> <a name="setenvifnocase" id="setenvifnocase">Directive</a></h2>
304 <table class="directive">
305 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
306 without respect to case</td></tr>
307 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIfNoCase <em>attribute regex
308 [!]env-variable</em>[=<em>value</em>]
309 [[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
310 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
311 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
312 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
313 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
316 <p>The <code class="directive">SetEnvIfNoCase</code> is semantically identical to
317 the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive,
318 and differs only in that the regular expression matching is
319 performed in a case-insensitive manner. For example:</p>
320 <pre class="prettyprint lang-config">
321 SetEnvIfNoCase Host Example\.Org site=example
325 <p>This will cause the <code>site</code> environment variable
326 to be set to "<code>example</code>" if the HTTP request header
327 field <code>Host:</code> was included and contained
328 <code>Example.Org</code>, <code>example.org</code>, or any other
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