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| <p class="apache">Apache HTTP Server Version 2.5</p> | |
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| <div id="preamble"><h1>Apache Module mod_isapi</h1> | |
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| <p><span>Available Languages: </span><a href="../en/mod/mod_isapi.html" title="English"> en </a> | | |
| <a href="../fr/mod/mod_isapi.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | | |
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| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>ISAPI Extensions within Apache for Windows</td></tr> | |
| <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr> | |
| <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>isapi_module</td></tr> | |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_isapi.c</td></tr> | |
| <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Win32 only</td></tr></table> | |
| <h3>Summary</h3> | |
| <p>This module implements the Internet Server extension API. It | |
| allows Internet Server extensions (<em>e.g.</em> ISAPI .dll | |
| modules) to be served by Apache for Windows, subject to the | |
| noted restrictions.</p> | |
| <p>ISAPI extension modules (.dll files) are written by third | |
| parties. The Apache Group does not author these modules, so we | |
| provide no support for them. Please contact the ISAPI's author | |
| directly if you are experiencing problems running their ISAPI | |
| extension. <strong>Please <em>do not</em> post such problems to | |
| Apache's lists or bug reporting pages.</strong></p> | |
| </div> | |
| <div id="quickview"><h3>Topics</h3> | |
| <ul id="topics"> | |
| <li><img alt="" src="../images/down.gif"> <a href="#usage">Usage</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#notes">Additional Notes</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#journal">Programmer's Journal</a></li> | |
| </ul><h3 class="directives">Directives</h3> | |
| <ul id="toc"> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapicachefile">ISAPICacheFile</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapifakeasync">ISAPIFakeAsync</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapilognotsupported">ISAPILogNotSupported</a></li> | |
| <li><img alt="" src="../images/down.gif"> <a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></li> | |
| </ul> | |
| <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_isapi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_isapi">Report a bug</a></li></ul></div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="section"> | |
| <h2 id="usage">Usage <a title="Permanent link" href="#usage" class="permalink">¶</a></h2> | |
| <p>In the server configuration file, use | |
| the <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive to | |
| associate ISAPI files with the <code>isapi-handler</code> handler, and map | |
| it to them with their file extensions. To enable any .dll file to be | |
| processed as an ISAPI extension, edit the httpd.conf file and add the | |
| following line:</p> | |
| <pre class="prettyprint lang-config">AddHandler isapi-handler .dll</pre> | |
| <div class="note">In older versions of the Apache server, | |
| <code>isapi-isa</code> was the proper handler name, rather than | |
| <code>isapi-handler</code>. As of 2.3 development versions of the Apache | |
| server, <code>isapi-isa</code> is no longer valid. You will need to | |
| change your configuration to use <code>isapi-handler</code> | |
| instead.</div> | |
| <p>There is no capability within the Apache server to leave a | |
| requested module loaded. However, you may preload and keep a | |
| specific module loaded by using the following syntax in your | |
| httpd.conf:</p> | |
| <pre class="prettyprint lang-config">ISAPICacheFile c:/WebWork/Scripts/ISAPI/mytest.dll</pre> | |
| <p>Whether or not you have preloaded an ISAPI extension, all | |
| ISAPI extensions are governed by the same permissions and | |
| 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 | |
| directory that contains the ISAPI .dll file.</p> | |
| <p>Review the <a href="#notes">Additional Notes</a> and the <a href="#journal">Programmer's Journal</a> for additional details | |
| and clarification of the specific ISAPI support offered by | |
| <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code>.</p> | |
| </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="section"> | |
| <h2 id="notes">Additional Notes <a title="Permanent link" href="#notes" class="permalink">¶</a></h2> | |
| <p>Apache's ISAPI implementation conforms to all of the ISAPI | |
| 2.0 specification, except for some "Microsoft-specific" | |
| extensions dealing with asynchronous I/O. Apache's I/O model | |
| does not allow asynchronous reading and writing in a manner | |
| that the ISAPI could access. If an ISA tries to access | |
| unsupported features, including async I/O, a message is placed | |
| in the error log to help with debugging. Since these messages | |
| can become a flood, the directive <code>ISAPILogNotSupported | |
| Off</code> exists to quiet this noise.</p> | |
| <p>Some servers, like Microsoft IIS, load the ISAPI extension | |
| into the server and keep it loaded until memory usage is too | |
| high, or unless configuration options are specified. Apache | |
| currently loads and unloads the ISAPI extension each time it is | |
| requested, unless the <code class="directive"><a href="#isapicachefile">ISAPICacheFile</a></code> directive is specified. | |
| This is inefficient, but Apache's memory model makes this the | |
| most effective method. Many ISAPI modules are subtly | |
| incompatible with the Apache server, and unloading these | |
| modules helps to ensure the stability of the server.</p> | |
| <p>Also, remember that while Apache supports ISAPI Extensions, | |
| it <strong>does not support ISAPI Filters</strong>. Support for | |
| filters may be added at a later date, but no support is planned | |
| at this time.</p> | |
| </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="section"> | |
| <h2 id="journal">Programmer's Journal <a title="Permanent link" href="#journal" class="permalink">¶</a></h2> | |
| <p>If you are programming Apache 2.0 <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code> | |
| modules, you must limit your calls to <code>ServerSupportFunction</code> | |
| to the following directives:</p> | |
| <dl> | |
| <dt><code>HSE_REQ_SEND_URL_REDIRECT_RESP</code></dt> | |
| <dd>Redirect the user to another location.<br> | |
| This must be a fully qualified URL (<em>e.g.</em> | |
| <code>http://server/location</code>).</dd> | |
| <dt><code>HSE_REQ_SEND_URL</code></dt> | |
| <dd>Redirect the user to another location.<br> | |
| This cannot be a fully qualified URL, you are not allowed to | |
| pass the protocol or a server name (<em>e.g.</em> simply | |
| <code>/location</code>).<br> | |
| This redirection is handled by the server, not the | |
| browser.<br> | |
| <div class="warning"><h3>Warning</h3> | |
| <p>In their recent documentation, Microsoft appears to have | |
| abandoned the distinction between the two | |
| <code>HSE_REQ_SEND_URL</code> functions. Apache continues to treat | |
| them as two distinct functions with different requirements | |
| and behaviors.</p> | |
| </div></dd> | |
| <dt><code>HSE_REQ_SEND_RESPONSE_HEADER</code></dt> | |
| <dd>Apache accepts a response body following the header if it | |
| follows the blank line (two consecutive newlines) in the | |
| headers string argument. This body cannot contain NULLs, | |
| since the headers argument is NULL terminated.</dd> | |
| <dt><code>HSE_REQ_DONE_WITH_SESSION</code></dt> | |
| <dd>Apache considers this a no-op, since the session will be | |
| finished when the ISAPI returns from processing.</dd> | |
| <dt><code>HSE_REQ_MAP_URL_TO_PATH</code></dt> | |
| <dd>Apache will translate a virtual name to a physical | |
| name.</dd> | |
| <dt><code>HSE_APPEND_LOG_PARAMETER</code></dt> | |
| <dd> | |
| This logged message may be captured in any of the following | |
| logs: | |
| <ul> | |
| <li>in the <code>\"%{isapi-parameter}n\"</code> component in a | |
| <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code> | |
| directive</li> | |
| <li>in the <code>%q</code> log component with the | |
| <code class="directive"><a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></code> | |
| <code>On</code> directive</li> | |
| <li>in the error log with the <code class="directive"><a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></code> <code>On</code> directive</li> | |
| </ul> | |
| <p>The first option, the <code>%{isapi-parameter}n</code> component, | |
| is always available and preferred.</p> | |
| </dd> | |
| <dt><code>HSE_REQ_IS_KEEP_CONN</code></dt> | |
| <dd>Will return the negotiated Keep-Alive status.</dd> | |
| <dt><code>HSE_REQ_SEND_RESPONSE_HEADER_EX</code></dt> | |
| <dd>Will behave as documented, although the <code>fKeepConn</code> | |
| flag is ignored.</dd> | |
| <dt><code>HSE_REQ_IS_CONNECTED</code></dt> | |
| <dd>Will report false if the request has been aborted.</dd> | |
| </dl> | |
| <p>Apache returns <code>FALSE</code> to any unsupported call to | |
| <code>ServerSupportFunction</code>, and sets the | |
| <code>GetLastError</code> value to | |
| <code>ERROR_INVALID_PARAMETER</code>.</p> | |
| <p><code>ReadClient</code> retrieves the request body exceeding the | |
| initial buffer (defined by <code class="directive"><a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></code>). Based on the | |
| <code class="directive">ISAPIReadAheadBuffer</code> setting (number of bytes | |
| to buffer prior to calling the ISAPI handler) shorter requests are sent | |
| complete to the extension when it is invoked. If the request is | |
| longer, the ISAPI extension must use <code>ReadClient</code> to | |
| retrieve the remaining request body.</p> | |
| <p><code>WriteClient</code> is supported, but only with the | |
| <code>HSE_IO_SYNC</code> flag or no option flag (value of | |
| <code>0</code>). Any other <code>WriteClient</code> request | |
| will be rejected with a return value of <code>FALSE</code>, and a | |
| <code>GetLastError</code> value of | |
| <code>ERROR_INVALID_PARAMETER</code>.</p> | |
| <p><code>GetServerVariable</code> is supported, although extended server | |
| variables do not exist (as defined by other servers.) All the | |
| usual Apache CGI environment variables are available from | |
| <code>GetServerVariable</code>, as well as the <code>ALL_HTTP</code> | |
| and <code>ALL_RAW</code> values.</p> | |
| <p>Since httpd 2.0, <code class="module"><a href="../mod/mod_isapi.html">mod_isapi</a></code> supports additional | |
| features introduced in later versions of the ISAPI specification, | |
| as well as limited emulation of async I/O and the | |
| <code>TransmitFile</code> semantics. Apache httpd also supports preloading | |
| ISAPI .dlls for performance.</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapiappendlogtoerrors"><span id="ISAPIAppendLogToErrors">ISAPIAppendLogToErrors</span> Directive <a title="Permanent link" href="#isapiappendlogtoerrors" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from | |
| ISAPI extensions to the error log</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToErrors on|off</code></td></tr> | |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToErrors off</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_isapi</td></tr> | |
| </table> | |
| <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI | |
| extensions to the server error log.</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapiappendlogtoquery"><span id="ISAPIAppendLogToQuery">ISAPIAppendLogToQuery</span> Directive <a title="Permanent link" href="#isapiappendlogtoquery" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from | |
| ISAPI extensions to the query field</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToQuery on|off</code></td></tr> | |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToQuery on</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_isapi</td></tr> | |
| </table> | |
| <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI | |
| 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> | |
| component).</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapicachefile"><span id="ISAPICacheFile">ISAPICacheFile</span> Directive <a title="Permanent link" href="#isapicachefile" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>ISAPI .dll files to be loaded at startup</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPICacheFile <var>file-path</var> [<var>file-path</var>] | |
| ...</code></td></tr> | |
| <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_isapi</td></tr> | |
| </table> | |
| <p>Specifies a space-separated list of file names to be loaded | |
| when the Apache server is launched, and remain loaded until the | |
| server is shut down. This directive may be repeated for every | |
| ISAPI .dll file desired. The full path name of each file should | |
| be specified. If the path name is not absolute, it will be treated | |
| relative to <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapifakeasync"><span id="ISAPIFakeAsync">ISAPIFakeAsync</span> Directive <a title="Permanent link" href="#isapifakeasync" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fake asynchronous support for ISAPI callbacks</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIFakeAsync on|off</code></td></tr> | |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIFakeAsync off</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_isapi</td></tr> | |
| </table> | |
| <p>While set to on, asynchronous support for ISAPI callbacks is | |
| simulated.</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapilognotsupported"><span id="ISAPILogNotSupported">ISAPILogNotSupported</span> Directive <a title="Permanent link" href="#isapilognotsupported" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log unsupported feature requests from ISAPI | |
| extensions</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPILogNotSupported on|off</code></td></tr> | |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPILogNotSupported off</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_isapi</td></tr> | |
| </table> | |
| <p>Logs all requests for unsupported features from ISAPI | |
| extensions in the server error log. This may help administrators | |
| to track down problems. Once set to on and all desired ISAPI modules | |
| are functioning, it should be set back to off.</p> | |
| </div> | |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div> | |
| <div class="directive-section"><h2 id="isapireadaheadbuffer"><span id="ISAPIReadAheadBuffer">ISAPIReadAheadBuffer</span> Directive <a title="Permanent link" href="#isapireadaheadbuffer" class="permalink">¶</a></h2> | |
| <table class="directive"> | |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size of the Read Ahead Buffer sent to ISAPI | |
| extensions</td></tr> | |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIReadAheadBuffer <var>size</var></code></td></tr> | |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIReadAheadBuffer 49152</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_isapi</td></tr> | |
| </table> | |
| <p>Defines the maximum size of the Read Ahead Buffer sent to | |
| ISAPI extensions when they are initially invoked. All remaining | |
| data must be retrieved using the <code>ReadClient</code> callback; some | |
| ISAPI extensions may not support the <code>ReadClient</code> function. | |
| Refer questions to the ISAPI extension's author.</p> | |
| </div> | |
| </div> | |
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