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<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">&nbsp;en&nbsp;</a> |
<a href="../fr/mod/mod_isapi.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
<a href="../ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
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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"><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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_isapi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;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>
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