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- <h1 align="CENTER">Module mod_isapi</h1>
-
- <p>This module supports ISAPI Extensions within Apache for
- Windows.</p>
-
- <p><a href="module-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="module-dict.html#SourceFile"
- rel="Help"><strong>Source File:</strong></a> mod_isapi.c<br />
- <a href="module-dict.html#ModuleIdentifier"
- rel="Help"><strong>Module Identifier:</strong></a>
- isapi_module<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> WIN32 only</p>
-
- <h2>Summary</h2>
-
- <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
- extention. <strong>Please <em>do not</em> post such problems to
- Apache's lists or bug reporting pages.</strong></p>
-
- <h2>Directives</h2>
-
- <ul>
- <li><a href="#isapifilecache">ISAPIFileCache</a></li>
-
- <li><a
- href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></li>
-
- <li><a
- href="#isapilognotsupported">ISAPILogNotSupported</a></li>
-
- <li><a
- href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></li>
-
- <li><a
- href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></li>
- </ul>
-
- <h2>Usage</h2>
-
- <p>In the server configuration file, use the AddHandler
- directive to associate ISAPI files with the
- <code>isapi-isa</code> handler, and map it to the with their
- file extensions. To enable any .dll file to be processed as an
- ISAPI extention, edit the httpd.conf file and add the following
- line:</p>
-<pre>
- AddHandler isapi-isa .dll
-</pre>
-
- <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>
- 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>Options
- 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
- mod_isapi.</p>
-
- <h2><a id="notes" name="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 ISAPICacheFile 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>
-
- <h2><a id="journal" name="journal">Programmer's
- Journal</a></h2>
-
- <p>If you are programming Apache 2.0 mod_isapi modules, you
- must limit your calls to ServerSupportFunction to the following
- directives:</p>
-
- <dl>
- <dt>HSE_REQ_SEND_URL_REDIRECT_RESP</dt>
-
- <dd>Redirect the user to another location.<br />
- This must be a fully qualified URL (e.g.
- http://server/location).</dd>
-
- <dt>HSE_REQ_SEND_URL</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 (e.g. simply
- /location).<br />
- This redirection is handled by the server, not the
- browser.<br />
- <strong>Warning:</strong> in their recent documentation,
- Microsoft appears to have abandoned the distinction between
- the two HSE_REQ_SEND_URL functions. Apache continues to treat
- them as two distinct functions with different requirements
- and behaviors.</dd>
-
- <dt>HSE_REQ_SEND_RESPONSE_HEADER</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>HSE_REQ_DONE_WITH_SESSION</dt>
-
- <dd>Apache considers this a no-op, since the session will be
- finished when the ISAPI returns from processing.</dd>
-
- <dt>HSE_REQ_MAP_URL_TO_PATH</dt>
-
- <dd>Apache will translate a virtual name to a physical
- name.</dd>
-
- <dt>HSE_APPEND_LOG_PARAMETER</dt>
-
- <dd>
- This logged message may be captured in any of the following
- logs:
-
- <ul>
- <li>in the \"%{isapi-parameter}n\" component in a
- CustomLog directive</li>
-
- <li>in the %q log component with the
- ISAPIAppendLogToQuery On directive</li>
-
- <li>in the error log with the ISAPIAppendLogToErrors On
- directive</li>
- </ul>
- The first option, the %{isapi-parameter}n component, is
- always available and prefered.
- </dd>
-
- <dt>HSE_REQ_IS_KEEP_CONN</dt>
-
- <dd>Will return the negotiated Keep-Alive status.</dd>
-
- <dt>HSE_REQ_SEND_RESPONSE_HEADER_EX</dt>
-
- <dd>Will behave as documented, although the fKeepConn flag is
- ignored.</dd>
-
- <dt>HSE_REQ_IS_CONNECTED</dt>
-
- <dd>Will report false if the request has been aborted.</dd>
- </dl>
-
- <p>Apache returns FALSE to any unsupported call to
- ServerSupportFunction, and sets the GetLastError value to
- ERROR_INVALID_PARAMETER.</p>
-
- <p>ReadClient retrieves the request body exceeding the initial
- buffer (defined by ISAPIReadAheadBuffer). Based on the
- ISAPIReadAheadBuffer 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 ReadClient to retrieve the
- remaining request body.</p>
-
- <p>WriteClient is supported, but only with the HSE_IO_SYNC flag
- or no option flag (value of 0). Any other WriteClient request
- will be rejected with a return value of FALSE, and a
- GetLastError value of ERROR_INVALID_PARAMETER.</p>
-
- <p>GetServerVariable is supported, although extended server
- variables do not exist (as defined by other servers.) All the
- usual Apache CGI environment variables are available from
- GetServerVariable, as well as the ALL_HTTP and ALL_RAW
- values.</p>
-
- <p>Apache 2.0 mod_isapi supports additional features introduced
- in later versions of the ISAPI specification, as well as
- limited emulation of async I/O and the TransmitFile semantics.
- Apache also supports preloading ISAPI .dlls for performance,
- neither of which were not available under Apache 1.3
- mod_isapi.</p>
- <hr />
-
- <h2><a id="isapifilecache" name="isapifilecache">ISAPIFileCache
- directive</a></h2>
- <!--%plaintext <?INDEX {\tt ISAPIFileCache} directive> -->
- <a href="directive-dict.html#Syntax"
- rel="Help"><strong>Syntax:</strong></a> ISAPIFileCache
- <em>file</em> [<em>file</em>] ...<br />
- <a href="directive-dict.html#Context"
- rel="Help"><strong>Context:</strong></a> server config<br />
- <a href="directive-dict.html#Override"
- rel="Help"><strong>Override:</strong></a> None<br />
- <a href="directive-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="directive-dict.html#Module"
- rel="Help"><strong>Module:</strong></a> mod_isapi<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> Apache 2.0 and
- later, Win32 only
-
- <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.</p>
- <hr />
-
- <h2><a id="isapireadaheadbuffer"
- name="isapireadaheadbuffer">ISAPIReadAheadBuffer
- directive</a></h2>
- <!--%plaintext <?INDEX {\tt ISAPIReadAheadBuffer} directive> -->
- <a href="directive-dict.html#Syntax"
- rel="Help"><strong>Syntax:</strong></a> ISAPIReadAheadBuffer
- <em>size</em><br />
- <a href="directive-dict.html#Default"
- rel="Help"><strong>Default:</strong></a> 49152<br />
- <a href="directive-dict.html#Context"
- rel="Help"><strong>Context:</strong></a> server config<br />
- <a href="directive-dict.html#Override"
- rel="Help"><strong>Override:</strong></a> None<br />
- <a href="directive-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="directive-dict.html#Module"
- rel="Help"><strong>Module:</strong></a> mod_isapi<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> Apache 1.3.13
- and later, Win32 only
-
- <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 ReadClient callback; some
- ISAPI extensions may not support the ReadClient function. Refer
- questions to the ISAPI extension's author.</p>
- <hr />
-
- <h2><a id="isapilognotsupported"
- name="isapilognotsupported">ISAPILogNotSupported
- directive</a></h2>
- <!--%plaintext <?INDEX {\tt ISAPILogNotSupported} directive> -->
- <a href="directive-dict.html#Syntax"
- rel="Help"><strong>Syntax:</strong></a> ISAPILogNotSupported
- on|off<br />
- <a href="directive-dict.html#Default"
- rel="Help"><strong>Default:</strong></a> on<br />
- <a href="directive-dict.html#Context"
- rel="Help"><strong>Context:</strong></a> server config<br />
- <a href="directive-dict.html#Override"
- rel="Help"><strong>Override:</strong></a> None<br />
- <a href="directive-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="directive-dict.html#Module"
- rel="Help"><strong>Module:</strong></a> mod_isapi<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> Apache 1.3.13
- and later, Win32 only
-
- <p>Logs all requests for unsupported features from ISAPI
- extensions in the server error log. While this should be turned
- off once all desired ISAPI modules are functioning, it defaults
- to on to help administrators track down problems.</p>
- <hr />
-
- <h2><a id="isapiappendlogtoerrors"
- name="isapiappendlogtoerrors">ISAPIAppendLogToErrors
- directive</a></h2>
- <!--%plaintext <?INDEX {\tt ISAPIAppendLogToErrors} directive> -->
- <a href="directive-dict.html#Syntax"
- rel="Help"><strong>Syntax:</strong></a> ISAPIAppendLogToErrors
- on|off<br />
- <a href="directive-dict.html#Default"
- rel="Help"><strong>Default:</strong></a> off<br />
- <a href="directive-dict.html#Context"
- rel="Help"><strong>Context:</strong></a> server config<br />
- <a href="directive-dict.html#Override"
- rel="Help"><strong>Override:</strong></a> None<br />
- <a href="directive-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="directive-dict.html#Module"
- rel="Help"><strong>Module:</strong></a> mod_isapi<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> Apache 1.3.13
- and later, Win32 only
-
- <p>Record HSE_APPEND_LOG_PARAMETER requests from ISAPI
- extensions to the server error log.</p>
- <hr />
-
- <h2><a id="isapiappendlogtoquery"
- name="isapiappendlogtoquery">ISAPIAppendLogToQuery
- directive</a></h2>
- <!--%plaintext <?INDEX {\tt ISAPIAppendLogToQuery} directive> -->
- <a href="directive-dict.html#Syntax"
- rel="Help"><strong>Syntax:</strong></a> ISAPIAppendLogToQuery
- on|off<br />
- <a href="directive-dict.html#Default"
- rel="Help"><strong>Default:</strong></a> off<br />
- <a href="directive-dict.html#Context"
- rel="Help"><strong>Context:</strong></a> server config<br />
- <a href="directive-dict.html#Override"
- rel="Help"><strong>Override:</strong></a> None<br />
- <a href="directive-dict.html#Status"
- rel="Help"><strong>Status:</strong></a> Base<br />
- <a href="directive-dict.html#Module"
- rel="Help"><strong>Module:</strong></a> mod_isapi<br />
- <a href="module-dict.html#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a> Apache 1.3.13
- and later, Win32 only
-
- <p>Record HSE_APPEND_LOG_PARAMETER requests from ISAPI
- extensions to the query field (appended to the CustomLog %q
- component).</p>
-
- <p><!--#include virtual="footer.html" -->
- </p>
- </body>
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