1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>Environment Variables in Apache - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" /> 12<script src="/style/scripts/prettify.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body id="manual-page"><div id="page-header"> 17<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p> 18<p class="apache">Apache HTTP Server Version 2.2</p> 19<img alt="" src="/images/feather.gif" /></div> 20<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 21<div id="path"> 22<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.2</a></div><div id="page-content"><div id="preamble"><h1>Environment Variables in Apache</h1> 23<div class="toplang"> 24<p><span>Available Languages: </span><a href="/en/env.html" title="English"> en </a> | 25<a href="/ja/env.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 26<a href="/ko/env.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 27<a href="/tr/env.html" hreflang="tr" rel="alternate" title="T�rk�e"> tr </a></p> 28</div> 29 30 <p>The Apache HTTP Server provides a mechanism for storing 31 information in named variables that are called <em>environment 32 variables</em>. This information can be used to control various 33 operations such as logging or access control. The variables are 34 also used as a mechanism to communicate with external programs 35 such as CGI scripts. This document discusses different ways to 36 manipulate and use these variables.</p> 37 38 <p>Although these variables are referred to as <em>environment 39 variables</em>, they are not the same as the environment 40 variables controlled by the underlying operating system. 41 Instead, these variables are stored and manipulated in an 42 internal Apache structure. They only become actual operating 43 system environment variables when they are provided to CGI 44 scripts and Server Side Include scripts. If you wish to 45 manipulate the operating system environment under which the 46 server itself runs, you must use the standard environment 47 manipulation mechanisms provided by your operating system 48 shell.</p> 49 </div> 50<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#setting">Setting Environment Variables</a></li> 51<li><img alt="" src="/images/down.gif" /> <a href="#using">Using Environment Variables</a></li> 52<li><img alt="" src="/images/down.gif" /> <a href="#special">Special Purpose Environment Variables</a></li> 53<li><img alt="" src="/images/down.gif" /> <a href="#examples">Examples</a></li> 54</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 55<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 56<div class="section"> 57<h2><a name="setting" id="setting">Setting Environment Variables</a></h2> 58 59 <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="/mod/mod_env.html">mod_env</a></code></li><li><code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code></li><li><code class="module"><a href="/mod/mod_setenvif.html">mod_setenvif</a></code></li><li><code class="module"><a href="/mod/mod_unique_id.html">mod_unique_id</a></code></li></ul></td><td><ul><li><code class="directive"><a href="/mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code></li><li><code class="directive"><a href="/mod/mod_setenvif.html#browsermatchnocase">BrowserMatchNoCase</a></code></li><li><code class="directive"><a href="/mod/mod_env.html#passenv">PassEnv</a></code></li><li><code class="directive"><a href="/mod/mod_rewrite.html#rewriterule">RewriteRule</a></code></li><li><code class="directive"><a href="/mod/mod_env.html#setenv">SetEnv</a></code></li><li><code class="directive"><a href="/mod/mod_setenvif.html#setenvif">SetEnvIf</a></code></li><li><code class="directive"><a href="/mod/mod_setenvif.html#setenvifnocase">SetEnvIfNoCase</a></code></li><li><code class="directive"><a href="/mod/mod_env.html#unsetenv">UnsetEnv</a></code></li></ul></td></tr></table> 60 61 <h3><a name="basic-manipulation" id="basic-manipulation">Basic Environment Manipulation</a></h3> 62 63 64 <p>The most basic way to set an environment variable in Apache 65 is using the unconditional <code class="directive"><a href="/mod/mod_env.html#setenv">SetEnv</a></code> directive. Variables may also be passed from 66 the environment of the shell which started the server using the 67 <code class="directive"><a href="/mod/mod_env.html#passenv">PassEnv</a></code> directive.</p> 68 69 70 <h3><a name="conditional" id="conditional">Conditional Per-Request Settings</a></h3> 71 72 73 <p>For additional flexibility, the directives provided by 74 <code class="module"><a href="/mod/mod_setenvif.html">mod_setenvif</a></code> allow environment variables to be set 75 on a per-request basis, conditional on characteristics of particular 76 requests. For example, a variable could be set only when a 77 specific browser (User-Agent) is making a request, or only when 78 a specific Referer [sic] header is found. Even more flexibility 79 is available through the <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code>'s <code class="directive"><a href="/mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> which uses the 80 <code>[E=...]</code> option to set environment variables.</p> 81 82 83 <h3><a name="unique-identifiers" id="unique-identifiers">Unique Identifiers</a></h3> 84 85 86 <p>Finally, <code class="module"><a href="/mod/mod_unique_id.html">mod_unique_id</a></code> sets the environment 87 variable <code>UNIQUE_ID</code> for each request to a value which is 88 guaranteed to be unique across "all" requests under very 89 specific conditions.</p> 90 91 92 <h3><a name="standard-cgi" id="standard-cgi">Standard CGI Variables</a></h3> 93 94 95 <p>In addition to all environment variables set within the 96 Apache configuration and passed from the shell, CGI scripts and 97 SSI pages are provided with a set of environment variables 98 containing meta-information about the request as required by 99 the <a href="http://www.w3.org/CGI/">CGI 100 specification</a>.</p> 101 102 103 <h3><a name="caveats" id="caveats">Some Caveats</a></h3> 104 105 106 <ul> 107 <li>It is not possible to override or change the standard CGI 108 variables using the environment manipulation directives.</li> 109 110 <li>When <code class="program"><a href="/programs/suexec.html">suexec</a></code> is used to launch 111 CGI scripts, the environment will be cleaned down to a set of 112 <em>safe</em> variables before CGI scripts are launched. The 113 list of <em>safe</em> variables is defined at compile-time in 114 <code>suexec.c</code>.</li> 115 116 <li>For portability reasons, the names of environment 117 variables may contain only letters, numbers, and the 118 underscore character. In addition, the first character may 119 not be a number. Characters which do not match this 120 restriction will be replaced by an underscore when passed to 121 CGI scripts and SSI pages.</li> 122 123 <li>The <code class="directive"><a href="/mod/mod_env.html#setenv">SetEnv</a></code> directive runs 124 late during request processing meaning that directives such as 125 <code class="directive"><a href="/mod/mod_setenvif.html#setenvif">SetEnvIf</a></code> and <code class="directive"><a href="/mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> will not see the 126 variables set with it.</li> 127 </ul> 128 129 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 130<div class="section"> 131<h2><a name="using" id="using">Using Environment Variables</a></h2> 132 133 134 <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="/mod/mod_authz_host.html">mod_authz_host</a></code></li><li><code class="module"><a href="/mod/mod_cgi.html">mod_cgi</a></code></li><li><code class="module"><a href="/mod/mod_ext_filter.html">mod_ext_filter</a></code></li><li><code class="module"><a href="/mod/mod_headers.html">mod_headers</a></code></li><li><code class="module"><a href="/mod/mod_include.html">mod_include</a></code></li><li><code class="module"><a href="/mod/mod_log_config.html">mod_log_config</a></code></li><li><code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code></li></ul></td><td><ul><li><code class="directive"><a href="/mod/mod_authz_host.html#allow">Allow</a></code></li><li><code class="directive"><a href="/mod/mod_log_config.html#customlog">CustomLog</a></code></li><li><code class="directive"><a href="/mod/mod_authz_host.html#deny">Deny</a></code></li><li><code class="directive"><a href="/mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a></code></li><li><code class="directive"><a href="/mod/mod_headers.html#header">Header</a></code></li><li><code class="directive"><a href="/mod/mod_log_config.html#logformat">LogFormat</a></code></li><li><code class="directive"><a href="/mod/mod_rewrite.html#rewritecond">RewriteCond</a></code></li><li><code class="directive"><a href="/mod/mod_rewrite.html#rewriterule">RewriteRule</a></code></li></ul></td></tr></table> 135 136 <h3><a name="cgi-scripts" id="cgi-scripts">CGI Scripts</a></h3> 137 138 139 <p>One of the primary uses of environment variables is to 140 communicate information to CGI scripts. As discussed above, the 141 environment passed to CGI scripts includes standard 142 meta-information about the request in addition to any variables 143 set within the Apache configuration. For more details, see the 144 <a href="howto/cgi.html">CGI tutorial</a>.</p> 145 146 147 <h3><a name="ssi-pages" id="ssi-pages">SSI Pages</a></h3> 148 149 150 <p>Server-parsed (SSI) documents processed by 151 <code class="module"><a href="/mod/mod_include.html">mod_include</a></code>'s 152 <code>INCLUDES</code> filter can print environment variables 153 using the <code>echo</code> element, and can use environment 154 variables in flow control elements to makes parts of a page 155 conditional on characteristics of a request. Apache also 156 provides SSI pages with the standard CGI environment variables 157 as discussed above. For more details, see the <a href="howto/ssi.html">SSI tutorial</a>.</p> 158 159 160 <h3><a name="access-control" id="access-control">Access Control</a></h3> 161 162 163 <p>Access to the server can be controlled based on the value of 164 environment variables using the <code>allow from env=</code> 165 and <code>deny from env=</code> directives. In combination with 166 <code class="directive"><a href="/mod/mod_setenvif.html#setenvif">SetEnvIf</a></code>, this 167 allows for flexible control of access to the server based on 168 characteristics of the client. For example, you can use these 169 directives to deny access to a particular browser (User-Agent). 170 </p> 171 172 173 <h3><a name="logging" id="logging">Conditional Logging</a></h3> 174 175 176 <p>Environment variables can be logged in the access log using 177 the <code class="directive"><a href="/mod/mod_log_config.html#logformat">LogFormat</a></code> 178 option <code>%e</code>. In addition, the decision on whether 179 or not to log requests can be made based on the status of 180 environment variables using the conditional form of the 181 <code class="directive"><a href="/mod/mod_log_config.html#customlog">CustomLog</a></code> 182 directive. In combination with <code class="directive"><a href="/mod/mod_setenvif.html#setenvif">SetEnvIf</a></code> this allows for flexible control of which 183 requests are logged. For example, you can choose not to log 184 requests for filenames ending in <code>gif</code>, or you can 185 choose to only log requests from clients which are outside your 186 subnet.</p> 187 188 189 <h3><a name="response-headers" id="response-headers">Conditional Response Headers</a></h3> 190 191 192 <p>The <code class="directive"><a href="/mod/mod_headers.html#header">Header</a></code> 193 directive can use the presence or 194 absence of an environment variable to determine whether or not 195 a certain HTTP header will be placed in the response to the 196 client. This allows, for example, a certain response header to 197 be sent only if a corresponding header is received in the 198 request from the client.</p> 199 200 201 202 <h3><a name="external-filter" id="external-filter">External Filter Activation</a></h3> 203 204 205 <p>External filters configured by <code class="module"><a href="/mod/mod_ext_filter.html">mod_ext_filter</a></code> 206 using the <code class="directive"><a href="/mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a></code> directive can 207 by activated conditional on an environment variable using the 208 <code>disableenv=</code> and <code>enableenv=</code> options.</p> 209 210 211 <h3><a name="url-rewriting" id="url-rewriting">URL Rewriting</a></h3> 212 213 214 <p>The <code>%{ENV:<em>variable</em>}</code> form of 215 <em>TestString</em> in the <code class="directive"><a href="/mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> allows <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code>'s rewrite 216 engine to make decisions conditional on environment variables. Note 217 that the variables accessible in <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code> without 218 the <code>ENV:</code> prefix are not actually environment variables. 219 Rather, they are variables special to <code class="module"><a href="/mod/mod_rewrite.html">mod_rewrite</a></code> 220 which cannot be accessed from other modules.</p> 221 222 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 223<div class="section"> 224<h2><a name="special" id="special">Special Purpose Environment Variables</a></h2> 225 226 227 <p>Interoperability problems have led to the introduction of 228 mechanisms to modify the way Apache behaves when talking to 229 particular clients. To make these mechanisms as flexible as 230 possible, they are invoked by defining environment variables, 231 typically with <code class="directive"><a href="/mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code>, though <code class="directive"><a href="/mod/mod_env.html#setenv">SetEnv</a></code> and <code class="directive"><a href="/mod/mod_env.html#passenv">PassEnv</a></code> could also be used, for example.</p> 232 233 <h3><a name="downgrade" id="downgrade">downgrade-1.0</a></h3> 234 235 236 <p>This forces the request to be treated as a HTTP/1.0 request 237 even if it was in a later dialect.</p> 238 239 240 <h3><a name="force-gzip" id="force-gzip">force-gzip</a></h3> 241 242 <p>If you have the <code>DEFLATE</code> filter activated, this 243 environment variable will ignore the accept-encoding setting of 244 your browser and will send compressed output unconditionally.</p> 245 246 <h3><a name="force-no-vary" id="force-no-vary">force-no-vary</a></h3> 247 248 249 <p>This causes any <code>Vary</code> fields to be removed from 250 the response header before it is sent back to the client. Some 251 clients don't interpret this field correctly; setting this 252 variable can work around this problem. Setting this variable 253 also implies <strong>force-response-1.0</strong>.</p> 254 255 256 <h3><a name="force-response" id="force-response">force-response-1.0</a></h3> 257 258 259 <p>This forces an HTTP/1.0 response to clients making an HTTP/1.0 260 request. It was originally 261 implemented as a result of a problem with AOL's proxies. Some 262 HTTP/1.0 clients may not behave correctly when given an HTTP/1.1 263 response, and this can be used to interoperate with them.</p> 264 265 266 267 <h3><a name="gzip-only-text-html" id="gzip-only-text-html">gzip-only-text/html</a></h3> 268 269 270 <p>When set to a value of "1", this variable disables the 271 <code>DEFLATE</code> output filter provided by 272 <code class="module"><a href="/mod/mod_deflate.html">mod_deflate</a></code> for content-types other than 273 <code>text/html</code>. If you'd rather 274 use statically compressed files, <code class="module"><a href="/mod/mod_negotiation.html">mod_negotiation</a></code> 275 evaluates the variable as well (not only for gzip, but for all 276 encodings that differ from "identity").</p> 277 278 279 <h3><a name="no-gzip" id="no-gzip">no-gzip</a></h3> 280 281 <p>When set, the <code>DEFLATE</code> filter of 282 <code class="module"><a href="/mod/mod_deflate.html">mod_deflate</a></code> will be turned off and 283 <code class="module"><a href="/mod/mod_negotiation.html">mod_negotiation</a></code> will refuse to deliver encoded 284 resources.</p> 285 286 287 288 <h3><a name="no-cache" id="no-cache">no-cache</a></h3> 289 <p><em>Available in versions 2.2.12 and later</em></p> 290 291 <p>When set, <code class="module"><a href="/mod/mod_cache.html">mod_cache</a></code> will not save an otherwise 292 cacheable response. This environment variable does not influence 293 whether a response already in the cache will be served for the current 294 request.</p> 295 296 297 298 <h3><a name="nokeepalive" id="nokeepalive">nokeepalive</a></h3> 299 300 301 <p>This disables <code class="directive"><a href="/mod/core.html#keepalive">KeepAlive</a></code> 302 when set.</p> 303 304 305 306 <h3><a name="prefer-language" id="prefer-language">prefer-language</a></h3> 307 308 <p>This influences <code class="module"><a href="/mod/mod_negotiation.html">mod_negotiation</a></code>'s behaviour. If 309 it contains a language tag (such as <code>en</code>, <code>ja</code> 310 or <code>x-klingon</code>), <code class="module"><a href="/mod/mod_negotiation.html">mod_negotiation</a></code> tries 311 to deliver a variant with that language. If there's no such variant, 312 the normal <a href="content-negotiation.html">negotiation</a> process 313 applies.</p> 314 315 316 317 <h3><a name="redirect-carefully" id="redirect-carefully">redirect-carefully</a></h3> 318 319 320 <p>This forces the server to be more careful when sending a redirect 321 to the client. This is typically used when a client has a known 322 problem handling redirects. This was originally implemented as a 323 result of a problem with Microsoft's WebFolders software which has 324 a problem handling redirects on directory resources via DAV 325 methods.</p> 326 327 328 329 <h3><a name="suppress-error-charset" id="suppress-error-charset">suppress-error-charset</a></h3> 330 331 332 <p><em>Available in versions after 2.0.54</em></p> 333 334 <p>When Apache issues a redirect in response to a client request, 335 the response includes some actual text to be displayed in case 336 the client can't (or doesn't) automatically follow the redirection. 337 Apache ordinarily labels this text according to the character set 338 which it uses, which is ISO-8859-1.</p> 339 340 <p> However, if the redirection is to a page that uses a different 341 character set, some broken browser versions will try to use the 342 character set from the redirection text rather than the actual page. 343 This can result in Greek, for instance, being incorrectly rendered.</p> 344 345 <p>Setting this environment variable causes Apache to omit the character 346 set for the redirection text, and these broken browsers will then correctly 347 use that of the destination page.</p> 348 349 <div class="warning"> 350 <h3>Security note</h3> 351 352 <p>Sending error pages without a specified character set may 353 allow a cross-site-scripting attack for existing browsers (MSIE) 354 which do not follow the HTTP/1.1 specification and attempt to 355 "guess" the character set from the content. Such browsers can 356 be easily fooled into using the UTF-7 character set, and UTF-7 357 content from input data (such as the request-URI) will not be 358 escaped by the usual escaping mechanisms designed to prevent 359 cross-site-scripting attacks.</p> 360 </div> 361 362 363 364 <h3><a name="proxy" id="proxy">force-proxy-request-1.0, proxy-nokeepalive, proxy-sendchunked, 365 proxy-sendcl, proxy-chain-auth, proxy-interim-response, proxy-initial-not-pooled</a></h3> 366 367 <p>These directives alter the protocol behavior of 368 <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code>. See the <code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="/mod/mod_proxy_http.html">mod_proxy_http</a></code> 369 documentation for more details.</p> 370 371 372 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 373<div class="section"> 374<h2><a name="examples" id="examples">Examples</a></h2> 375 376 377 <h3><a name="misbehaving" id="misbehaving">Changing protocol behavior with misbehaving clients</a></h3> 378 379 380 <p>Earlier versions recommended that the following lines be included in 381 httpd.conf to deal with known client problems. Since the affected clients 382 are no longer seen in the wild, this configuration is likely no-longer 383 necessary.</p> 384<div class="example"><pre> 385# 386# The following directives modify normal HTTP response behavior. 387# The first directive disables keepalive for Netscape 2.x and browsers that 388# spoof it. There are known problems with these browser implementations. 389# The second directive is for Microsoft Internet Explorer 4.0b2 390# which has a broken HTTP/1.1 implementation and does not properly 391# support keepalive when it is used on 301 or 302 (redirect) responses. 392# 393BrowserMatch "Mozilla/2" nokeepalive 394BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0 395 396# 397# The following directive disables HTTP/1.1 responses to browsers which 398# are in violation of the HTTP/1.0 spec by not being able to grok a 399# basic 1.1 response. 400# 401BrowserMatch "RealPlayer 4\.0" force-response-1.0 402BrowserMatch "Java/1\.0" force-response-1.0 403BrowserMatch "JDK/1\.0" force-response-1.0</pre></div> 404 405 406 <h3><a name="no-img-log" id="no-img-log">Do not log requests for images in the access log</a></h3> 407 408 409 <p>This example keeps requests for images from appearing in the 410 access log. It can be easily modified to prevent logging of 411 particular directories, or to prevent logging of requests 412 coming from particular hosts.</p> 413 414 <div class="example"><p><code> 415 SetEnvIf Request_URI \.gif image-request<br /> 416 SetEnvIf Request_URI \.jpg image-request<br /> 417 SetEnvIf Request_URI \.png image-request<br /> 418 CustomLog logs/access_log common env=!image-request 419 </code></p></div> 420 421 422 <h3><a name="image-theft" id="image-theft">Prevent "Image Theft"</a></h3> 423 424 425 <p>This example shows how to keep people not on your server 426 from using images on your server as inline-images on their 427 pages. This is not a recommended configuration, but it can work 428 in limited circumstances. We assume that all your images are in 429 a directory called /web/images.</p> 430 431 <div class="example"><p><code> 432 SetEnvIf Referer "^http://www\.example\.com/" local_referal 433 # Allow browsers that do not send Referer info 434 SetEnvIf Referer "^$" local_referal 435 <Directory /web/images> 436 <span class="indent"> 437 Order Deny,Allow<br /> 438 Deny from all<br /> 439 Allow from env=local_referal 440 </span> 441 </Directory> 442 </code></p></div> 443 444 <p>For more information about this technique, see the 445 "<a href="http://www.serverwatch.com/tutorials/article.php/1132731">Keeping Your Images from Adorning Other Sites</a>" tutorial on 446 ServerWatch.</p> 447 448 </div></div> 449<div class="bottomlang"> 450<p><span>Available Languages: </span><a href="/en/env.html" title="English"> en </a> | 451<a href="/ja/env.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 452<a href="/ko/env.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 453<a href="/tr/env.html" hreflang="tr" rel="alternate" title="T�rk�e"> tr </a></p> 454</div><div class="top"><a href="#page-header"><img src="/images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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