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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
commit | fe39ffb8b90ae4e002ed73fe98617cd590abb467 (patch) | |
tree | b80e5956907d8aeaaffe4e4f0c068c0e6157ce8b /docs/manual/mod/mod_isapi.html.en | |
parent | Initial commit. (diff) | |
download | apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.tar.xz apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.zip |
Adding upstream version 2.4.56.upstream/2.4.56upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | docs/manual/mod/mod_isapi.html.en | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_isapi.html.en b/docs/manual/mod/mod_isapi.html.en new file mode 100644 index 0000000..a7d2f51 --- /dev/null +++ b/docs/manual/mod/mod_isapi.html.en @@ -0,0 +1,371 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_isapi - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<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" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<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> +<p class="apache">Apache HTTP Server Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<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 2.4</a> > <a href="./">Modules</a></div> +<div id="page-content"> +<div id="preamble"><h1>Apache Module mod_isapi</h1> +<div class="toplang"> +<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> | +<a href="../ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div> +<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"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><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><h3>See also</h3> +<ul class="seealso"> +<li><a href="#comments_section">Comments</a></li></ul></div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="usage" id="usage">Usage</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><a name="notes" id="notes">Additional Notes</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><a name="journal" id="journal">Programmer's Journal</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><a name="ISAPIAppendLogToErrors" id="ISAPIAppendLogToErrors">ISAPIAppendLogToErrors</a> <a name="isapiappendlogtoerrors" id="isapiappendlogtoerrors">Directive</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><a name="ISAPIAppendLogToQuery" id="ISAPIAppendLogToQuery">ISAPIAppendLogToQuery</a> <a name="isapiappendlogtoquery" id="isapiappendlogtoquery">Directive</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><a name="ISAPICacheFile" id="ISAPICacheFile">ISAPICacheFile</a> <a name="isapicachefile" id="isapicachefile">Directive</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><a name="ISAPIFakeAsync" id="ISAPIFakeAsync">ISAPIFakeAsync</a> <a name="isapifakeasync" id="isapifakeasync">Directive</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><a name="ISAPILogNotSupported" id="ISAPILogNotSupported">ISAPILogNotSupported</a> <a name="isapilognotsupported" id="isapilognotsupported">Directive</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><a name="ISAPIReadAheadBuffer" id="ISAPIReadAheadBuffer">ISAPIReadAheadBuffer</a> <a name="isapireadaheadbuffer" id="isapireadaheadbuffer">Directive</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> +<div class="bottomlang"> +<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> | +<a href="../ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</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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