github.com/krum110487/go-htaccess@v0.0.0-20240316004156-60641c8e7598/tests/data/apache_2_2_34/manual/mod/mod_isapi.html.en (about) 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 <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /> 5 <!-- 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 This file is generated from xml source: DO NOT EDIT 8 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 9 --> 10 <title>mod_isapi - Apache HTTP Server Version 2.2</title> 11 <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 12 <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 13 <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" /> 14 <script src="../style/scripts/prettify.min.js" type="text/javascript"> 15 </script> 16 17 <link href="../images/favicon.ico" rel="shortcut icon" /><link href="http://httpd.apache.org/docs/current/mod/mod_isapi.html" rel="canonical" /></head> 18 <body> 19 <div id="page-header"> 20 <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> 21 <p class="apache">Apache HTTP Server Version 2.2</p> 22 <img alt="" src="../images/feather.gif" /></div> 23 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> 24 <div id="path"> 25 <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> > <a href="./">Modules</a></div> 26 <div id="page-content"> 27 <div class="retired"><h4>Please note</h4> 28 <p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p> 29 <p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_isapi.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_isapi</h1> 30 <div class="toplang"> 31 <p><span>Available Languages: </span><a href="../en/mod/mod_isapi.html" title="English"> en </a> | 32 <a href="../ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> 33 </div> 34 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>ISAPI Extensions within Apache for Windows</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>isapi_module</td></tr> 37 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_isapi.c</td></tr> 38 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Win32 only</td></tr></table> 39 <h3>Summary</h3> 40 41 <p>This module implements the Internet Server extension API. It 42 allows Internet Server extensions (<em>e.g.</em> ISAPI .dll 43 modules) to be served by Apache for Windows, subject to the 44 noted restrictions.</p> 45 46 <p>ISAPI extension modules (.dll files) are written by third 47 parties. The Apache Group does not author these modules, so we 48 provide no support for them. Please contact the ISAPI's author 49 directly if you are experiencing problems running their ISAPI 50 extension. <strong>Please <em>do not</em> post such problems to 51 Apache's lists or bug reporting pages.</strong></p> 52 </div> 53 <div id="quickview"><h3>Topics</h3> 54 <ul id="topics"> 55 <li><img alt="" src="../images/down.gif" /> <a href="#usage">Usage</a></li> 56 <li><img alt="" src="../images/down.gif" /> <a href="#notes">Additional Notes</a></li> 57 <li><img alt="" src="../images/down.gif" /> <a href="#journal">Programmer's Journal</a></li> 58 </ul><h3 class="directives">Directives</h3> 59 <ul id="toc"> 60 <li><img alt="" src="../images/down.gif" /> <a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></li> 61 <li><img alt="" src="../images/down.gif" /> <a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></li> 62 <li><img alt="" src="../images/down.gif" /> <a href="#isapicachefile">ISAPICacheFile</a></li> 63 <li><img alt="" src="../images/down.gif" /> <a href="#isapifakeasync">ISAPIFakeAsync</a></li> 64 <li><img alt="" src="../images/down.gif" /> <a href="#isapilognotsupported">ISAPILogNotSupported</a></li> 65 <li><img alt="" src="../images/down.gif" /> <a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></li> 66 </ul> 67 <ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 68 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 69 <div class="section"> 70 <h2><a name="usage" id="usage">Usage</a></h2> 71 72 <p>In the server configuration file, use 73 the <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive to 74 associate ISAPI files with the <code>isapi-handler</code> handler, and map 75 it to them with their file extensions. To enable any .dll file to be 76 processed as an ISAPI extension, edit the httpd.conf file and add the 77 following line:</p> 78 <div class="example"><p><code> 79 AddHandler isapi-handler .dll 80 </code></p></div> 81 82 <div class="note">In older versions of the Apache server, 83 <code>isapi-isa</code> was the proper handler name, rather than 84 <code>isapi-handler</code>. For compatibility, configurations may 85 continue using <code>isapi-isa</code> through all versions of Apache 86 prior to 2.3.0.</div> 87 88 <p>There is no capability within the Apache server to leave a 89 requested module loaded. However, you may preload and keep a 90 specific module loaded by using the following syntax in your 91 httpd.conf:</p> 92 <div class="example"><p><code> 93 ISAPICacheFile c:/WebWork/Scripts/ISAPI/mytest.dll 94 </code></p></div> 95 96 <p>Whether or not you have preloaded an ISAPI extension, all 97 ISAPI extensions are governed by the same permissions and 98 restrictions as CGI scripts. That is, <code class="directive"><a href="../mod/core.html#options">Options</a></code> <code>ExecCGI</code> must be set for the 99 directory that contains the ISAPI .dll file.</p> 100 101 <p>Review the <a href="#notes">Additional Notes</a> and the <a href="#journal">Programmer's Journal</a> for additional details 102 and clarification of the specific ISAPI support offered by 103 <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code>.</p> 104 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 105 <div class="section"> 106 <h2><a name="notes" id="notes">Additional Notes</a></h2> 107 108 <p>Apache's ISAPI implementation conforms to all of the ISAPI 109 2.0 specification, except for some "Microsoft-specific" 110 extensions dealing with asynchronous I/O. Apache's I/O model 111 does not allow asynchronous reading and writing in a manner 112 that the ISAPI could access. If an ISA tries to access 113 unsupported features, including async I/O, a message is placed 114 in the error log to help with debugging. Since these messages 115 can become a flood, the directive <code>ISAPILogNotSupported 116 Off</code> exists to quiet this noise.</p> 117 118 <p>Some servers, like Microsoft IIS, load the ISAPI extension 119 into the server and keep it loaded until memory usage is too 120 high, or unless configuration options are specified. Apache 121 currently loads and unloads the ISAPI extension each time it is 122 requested, unless the <code class="directive"><a href="#isapicachefile">ISAPICacheFile</a></code> directive is specified. 123 This is inefficient, but Apache's memory model makes this the 124 most effective method. Many ISAPI modules are subtly 125 incompatible with the Apache server, and unloading these 126 modules helps to ensure the stability of the server.</p> 127 128 <p>Also, remember that while Apache supports ISAPI Extensions, 129 it <strong>does not support ISAPI Filters</strong>. Support for 130 filters may be added at a later date, but no support is planned 131 at this time.</p> 132 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 133 <div class="section"> 134 <h2><a name="journal" id="journal">Programmer's Journal</a></h2> 135 136 <p>If you are programming Apache 2.0 <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code> 137 modules, you must limit your calls to <code>ServerSupportFunction</code> 138 to the following directives:</p> 139 140 <dl> 141 <dt><code>HSE_REQ_SEND_URL_REDIRECT_RESP</code></dt> 142 <dd>Redirect the user to another location.<br /> 143 This must be a fully qualified URL (<em>e.g.</em> 144 <code>http://server/location</code>).</dd> 145 146 <dt><code>HSE_REQ_SEND_URL</code></dt> 147 <dd>Redirect the user to another location.<br /> 148 This cannot be a fully qualified URL, you are not allowed to 149 pass the protocol or a server name (<em>e.g.</em> simply 150 <code>/location</code>).<br /> 151 This redirection is handled by the server, not the 152 browser.<br /> 153 <div class="warning"><h3>Warning</h3> 154 <p>In their recent documentation, Microsoft appears to have 155 abandoned the distinction between the two 156 <code>HSE_REQ_SEND_URL</code> functions. Apache continues to treat 157 them as two distinct functions with different requirements 158 and behaviors.</p> 159 </div></dd> 160 161 <dt><code>HSE_REQ_SEND_RESPONSE_HEADER</code></dt> 162 <dd>Apache accepts a response body following the header if it 163 follows the blank line (two consecutive newlines) in the 164 headers string argument. This body cannot contain NULLs, 165 since the headers argument is NULL terminated.</dd> 166 167 <dt><code>HSE_REQ_DONE_WITH_SESSION</code></dt> 168 <dd>Apache considers this a no-op, since the session will be 169 finished when the ISAPI returns from processing.</dd> 170 171 <dt><code>HSE_REQ_MAP_URL_TO_PATH</code></dt> 172 <dd>Apache will translate a virtual name to a physical 173 name.</dd> 174 175 <dt><code>HSE_APPEND_LOG_PARAMETER</code></dt> 176 <dd> 177 This logged message may be captured in any of the following 178 logs: 179 180 <ul> 181 <li>in the <code>\"%{isapi-parameter}n\"</code> component in a 182 <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code> 183 directive</li> 184 185 <li>in the <code>%q</code> log component with the 186 <code class="directive"><a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></code> 187 <code>On</code> directive</li> 188 189 <li>in the error log with the <code class="directive"><a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></code> <code>On</code> directive</li> 190 </ul> 191 192 <p>The first option, the <code>%{isapi-parameter}n</code> component, 193 is always available and preferred.</p> 194 </dd> 195 196 <dt><code>HSE_REQ_IS_KEEP_CONN</code></dt> 197 <dd>Will return the negotiated Keep-Alive status.</dd> 198 199 <dt><code>HSE_REQ_SEND_RESPONSE_HEADER_EX</code></dt> 200 <dd>Will behave as documented, although the <code>fKeepConn</code> 201 flag is ignored.</dd> 202 203 <dt><code>HSE_REQ_IS_CONNECTED</code></dt> 204 <dd>Will report false if the request has been aborted.</dd> 205 </dl> 206 207 <p>Apache returns <code>FALSE</code> to any unsupported call to 208 <code>ServerSupportFunction</code>, and sets the 209 <code>GetLastError</code> value to 210 <code>ERROR_INVALID_PARAMETER</code>.</p> 211 212 <p><code>ReadClient</code> retrieves the request body exceeding the 213 initial buffer (defined by <code class="directive"><a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></code>). Based on the 214 <code class="directive">ISAPIReadAheadBuffer</code> setting (number of bytes 215 to buffer prior to calling the ISAPI handler) shorter requests are sent 216 complete to the extension when it is invoked. If the request is 217 longer, the ISAPI extension must use <code>ReadClient</code> to 218 retrieve the remaining request body.</p> 219 220 <p><code>WriteClient</code> is supported, but only with the 221 <code>HSE_IO_SYNC</code> flag or no option flag (value of 222 <code>0</code>). Any other <code>WriteClient</code> request 223 will be rejected with a return value of <code>FALSE</code>, and a 224 <code>GetLastError</code> value of 225 <code>ERROR_INVALID_PARAMETER</code>.</p> 226 227 <p><code>GetServerVariable</code> is supported, although extended server 228 variables do not exist (as defined by other servers.) All the 229 usual Apache CGI environment variables are available from 230 <code>GetServerVariable</code>, as well as the <code>ALL_HTTP</code> 231 and <code>ALL_RAW</code> values.</p> 232 233 <p>Apache 2.0 <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code> supports additional 234 features introduced in later versions of the ISAPI specification, 235 as well as limited emulation of async I/O and the 236 <code>TransmitFile</code> semantics. Apache also supports preloading 237 ISAPI .dlls for performance, neither of which were not available under 238 Apache 1.3 <code>mod_isapi</code>.</p> 239 </div> 240 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 241 <div class="directive-section"><h2><a name="ISAPIAppendLogToErrors" id="ISAPIAppendLogToErrors">ISAPIAppendLogToErrors</a> <a name="isapiappendlogtoerrors" id="isapiappendlogtoerrors">Directive</a></h2> 242 <table class="directive"> 243 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from 244 ISAPI extensions to the error log</td></tr> 245 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToErrors on|off</code></td></tr> 246 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToErrors off</code></td></tr> 247 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 248 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> 249 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 250 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 251 </table> 252 <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI 253 extensions to the server error log.</p> 254 255 </div> 256 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 257 <div class="directive-section"><h2><a name="ISAPIAppendLogToQuery" id="ISAPIAppendLogToQuery">ISAPIAppendLogToQuery</a> <a name="isapiappendlogtoquery" id="isapiappendlogtoquery">Directive</a></h2> 258 <table class="directive"> 259 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from 260 ISAPI extensions to the query field</td></tr> 261 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToQuery on|off</code></td></tr> 262 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToQuery on</code></td></tr> 263 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 264 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> 265 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 266 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 267 </table> 268 <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI 269 extensions to the query field (appended to the <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code> <code>%q</code> 270 component).</p> 271 272 </div> 273 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 274 <div class="directive-section"><h2><a name="ISAPICacheFile" id="ISAPICacheFile">ISAPICacheFile</a> <a name="isapicachefile" id="isapicachefile">Directive</a></h2> 275 <table class="directive"> 276 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>ISAPI .dll files to be loaded at startup</td></tr> 277 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPICacheFile <var>file-path</var> [<var>file-path</var>] 278 ...</code></td></tr> 279 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 280 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 281 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 282 </table> 283 <p>Specifies a space-separated list of file names to be loaded 284 when the Apache server is launched, and remain loaded until the 285 server is shut down. This directive may be repeated for every 286 ISAPI .dll file desired. The full path name of each file should 287 be specified. If the path name is not absolute, it will be treated 288 relative to <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</p> 289 290 </div> 291 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 292 <div class="directive-section"><h2><a name="ISAPIFakeAsync" id="ISAPIFakeAsync">ISAPIFakeAsync</a> <a name="isapifakeasync" id="isapifakeasync">Directive</a></h2> 293 <table class="directive"> 294 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fake asynchronous support for ISAPI callbacks</td></tr> 295 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIFakeAsync on|off</code></td></tr> 296 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIFakeAsync off</code></td></tr> 297 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 298 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> 299 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 300 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 301 </table> 302 <p>While set to on, asynchronous support for ISAPI callbacks is 303 simulated.</p> 304 305 </div> 306 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 307 <div class="directive-section"><h2><a name="ISAPILogNotSupported" id="ISAPILogNotSupported">ISAPILogNotSupported</a> <a name="isapilognotsupported" id="isapilognotsupported">Directive</a></h2> 308 <table class="directive"> 309 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log unsupported feature requests from ISAPI 310 extensions</td></tr> 311 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPILogNotSupported on|off</code></td></tr> 312 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPILogNotSupported off</code></td></tr> 313 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 314 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> 315 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 316 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 317 </table> 318 <p>Logs all requests for unsupported features from ISAPI 319 extensions in the server error log. This may help administrators 320 to track down problems. Once set to on and all desired ISAPI modules 321 are functioning, it should be set back to off.</p> 322 323 </div> 324 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 325 <div class="directive-section"><h2><a name="ISAPIReadAheadBuffer" id="ISAPIReadAheadBuffer">ISAPIReadAheadBuffer</a> <a name="isapireadaheadbuffer" id="isapireadaheadbuffer">Directive</a></h2> 326 <table class="directive"> 327 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size of the Read Ahead Buffer sent to ISAPI 328 extensions</td></tr> 329 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIReadAheadBuffer <var>size</var></code></td></tr> 330 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIReadAheadBuffer 49152</code></td></tr> 331 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 332 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr> 333 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> 334 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr> 335 </table> 336 <p>Defines the maximum size of the Read Ahead Buffer sent to 337 ISAPI extensions when they are initially invoked. All remaining 338 data must be retrieved using the <code>ReadClient</code> callback; some 339 ISAPI extensions may not support the <code>ReadClient</code> function. 340 Refer questions to the ISAPI extension's author.</p> 341 342 </div> 343 </div> 344 <div class="bottomlang"> 345 <p><span>Available Languages: </span><a href="../en/mod/mod_isapi.html" title="English"> en </a> | 346 <a href="../ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> 347 </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. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. 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