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24<div id="page-content">
25<div id="preamble"><h1>Apache Module mod_isapi</h1>
26<div class="toplang">
27<p><span>Available Languages: </span><a href="/en/mod/mod_isapi.html" title="English">&nbsp;en&nbsp;</a> |
28<a href="/ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
29</div>
30<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>ISAPI Extensions within Apache for Windows</td></tr>
31<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
32<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>isapi_module</td></tr>
33<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_isapi.c</td></tr>
34<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Win32 only</td></tr></table>
35<h3>Summary</h3>
36
37    <p>This module implements the Internet Server extension API. It
38    allows Internet Server extensions (<em>e.g.</em> ISAPI .dll
39    modules) to be served by Apache for Windows, subject to the
40    noted restrictions.</p>
41
42    <p>ISAPI extension modules (.dll files) are written by third
43    parties. The Apache Group does not author these modules, so we
44    provide no support for them. Please contact the ISAPI's author
45    directly if you are experiencing problems running their ISAPI
46    extension. <strong>Please <em>do not</em> post such problems to
47    Apache's lists or bug reporting pages.</strong></p>
48</div>
49<div id="quickview"><h3 class="directives">Directives</h3>
50<ul id="toc">
51<li><img alt="" src="/images/down.gif" /> <a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></li>
52<li><img alt="" src="/images/down.gif" /> <a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></li>
53<li><img alt="" src="/images/down.gif" /> <a href="#isapicachefile">ISAPICacheFile</a></li>
54<li><img alt="" src="/images/down.gif" /> <a href="#isapifakeasync">ISAPIFakeAsync</a></li>
55<li><img alt="" src="/images/down.gif" /> <a href="#isapilognotsupported">ISAPILogNotSupported</a></li>
56<li><img alt="" src="/images/down.gif" /> <a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></li>
57</ul>
58<h3>Topics</h3>
59<ul id="topics">
60<li><img alt="" src="/images/down.gif" /> <a href="#usage">Usage</a></li>
61<li><img alt="" src="/images/down.gif" /> <a href="#notes">Additional Notes</a></li>
62<li><img alt="" src="/images/down.gif" /> <a href="#journal">Programmer's Journal</a></li>
63</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
64<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
65<div class="section">
66<h2><a name="usage" id="usage">Usage</a></h2>
67
68    <p>In the server configuration file, use
69    the <code class="directive"><a href="/mod/mod_mime.html#addhandler">AddHandler</a></code> directive to
70    associate ISAPI files with the <code>isapi-handler</code> handler, and map
71    it to them with their file extensions. To enable any .dll file to be
72    processed as an ISAPI extension, edit the httpd.conf file and add the
73    following line:</p>
74    <div class="example"><p><code>
75        AddHandler isapi-handler .dll
76    </code></p></div>
77
78    <div class="note">In older versions of the Apache server,
79    <code>isapi-isa</code> was the proper handler name, rather than
80    <code>isapi-handler</code>. For compatibility, configurations may
81    continue using <code>isapi-isa</code> through all versions of Apache
82    prior to 2.3.0.</div>
83
84    <p>There is no capability within the Apache server to leave a
85    requested module loaded. However, you may preload and keep a
86    specific module loaded by using the following syntax in your
87    httpd.conf:</p>
88    <div class="example"><p><code>
89        ISAPICacheFile c:/WebWork/Scripts/ISAPI/mytest.dll
90    </code></p></div>
91
92    <p>Whether or not you have preloaded an ISAPI extension, all
93    ISAPI extensions are governed by the same permissions and
94    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
95    directory that contains the ISAPI .dll file.</p>
96
97    <p>Review the <a href="#notes">Additional Notes</a> and the <a href="#journal">Programmer's Journal</a> for additional details
98    and clarification of the specific ISAPI support offered by
99    <code class="module"><a href="/mod/mod_isapi.html">mod_isapi</a></code>.</p>
100</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
101<div class="section">
102<h2><a name="notes" id="notes">Additional Notes</a></h2>
103
104    <p>Apache's ISAPI implementation conforms to all of the ISAPI
105    2.0 specification, except for some "Microsoft-specific"
106    extensions dealing with asynchronous I/O. Apache's I/O model
107    does not allow asynchronous reading and writing in a manner
108    that the ISAPI could access. If an ISA tries to access
109    unsupported features, including async I/O, a message is placed
110    in the error log to help with debugging. Since these messages
111    can become a flood, the directive <code>ISAPILogNotSupported
112    Off</code> exists to quiet this noise.</p>
113
114    <p>Some servers, like Microsoft IIS, load the ISAPI extension
115    into the server and keep it loaded until memory usage is too
116    high, or unless configuration options are specified. Apache
117    currently loads and unloads the ISAPI extension each time it is
118    requested, unless the <code class="directive"><a href="#isapicachefile">ISAPICacheFile</a></code> directive is specified.
119    This is inefficient, but Apache's memory model makes this the
120    most effective method. Many ISAPI modules are subtly
121    incompatible with the Apache server, and unloading these
122    modules helps to ensure the stability of the server.</p>
123
124    <p>Also, remember that while Apache supports ISAPI Extensions,
125    it <strong>does not support ISAPI Filters</strong>. Support for
126    filters may be added at a later date, but no support is planned
127    at this time.</p>
128</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
129<div class="section">
130<h2><a name="journal" id="journal">Programmer's Journal</a></h2>
131
132    <p>If you are programming Apache 2.0 <code class="module"><a href="/mod/mod_isapi.html">mod_isapi</a></code>
133    modules, you must limit your calls to <code>ServerSupportFunction</code>
134    to the following directives:</p>
135
136    <dl>
137      <dt><code>HSE_REQ_SEND_URL_REDIRECT_RESP</code></dt>
138      <dd>Redirect the user to another location.<br />
139      This must be a fully qualified URL (<em>e.g.</em>
140      <code>http://server/location</code>).</dd>
141
142      <dt><code>HSE_REQ_SEND_URL</code></dt>
143      <dd>Redirect the user to another location.<br />
144      This cannot be a fully qualified URL, you are not allowed to
145      pass the protocol or a server name (<em>e.g.</em> simply
146      <code>/location</code>).<br />
147      This redirection is handled by the server, not the
148      browser.<br />
149      <div class="warning"><h3>Warning</h3>
150        <p>In their recent documentation, Microsoft appears to have
151        abandoned the distinction between the two
152        <code>HSE_REQ_SEND_URL</code> functions. Apache continues to treat
153        them as two distinct functions with different requirements
154        and behaviors.</p>
155      </div></dd>
156
157      <dt><code>HSE_REQ_SEND_RESPONSE_HEADER</code></dt>
158      <dd>Apache accepts a response body following the header if it
159      follows the blank line (two consecutive newlines) in the
160      headers string argument. This body cannot contain NULLs,
161      since the headers argument is NULL terminated.</dd>
162
163      <dt><code>HSE_REQ_DONE_WITH_SESSION</code></dt>
164      <dd>Apache considers this a no-op, since the session will be
165      finished when the ISAPI returns from processing.</dd>
166
167      <dt><code>HSE_REQ_MAP_URL_TO_PATH</code></dt>
168      <dd>Apache will translate a virtual name to a physical
169      name.</dd>
170
171      <dt><code>HSE_APPEND_LOG_PARAMETER</code></dt>
172      <dd>
173        This logged message may be captured in any of the following
174        logs:
175
176        <ul>
177          <li>in the <code>\"%{isapi-parameter}n\"</code> component in a
178          <code class="directive"><a href="/mod/mod_log_config.html#customlog">CustomLog</a></code>
179          directive</li>
180
181          <li>in the <code>%q</code> log component with the
182          <code class="directive"><a href="#isapiappendlogtoquery">ISAPIAppendLogToQuery</a></code>
183          <code>On</code> directive</li>
184
185          <li>in the error log with the <code class="directive"><a href="#isapiappendlogtoerrors">ISAPIAppendLogToErrors</a></code> <code>On</code> directive</li>
186        </ul>
187
188        <p>The first option, the <code>%{isapi-parameter}n</code> component,
189        is always available and preferred.</p>
190      </dd>
191
192      <dt><code>HSE_REQ_IS_KEEP_CONN</code></dt>
193      <dd>Will return the negotiated Keep-Alive status.</dd>
194
195      <dt><code>HSE_REQ_SEND_RESPONSE_HEADER_EX</code></dt>
196      <dd>Will behave as documented, although the <code>fKeepConn</code>
197      flag is ignored.</dd>
198
199      <dt><code>HSE_REQ_IS_CONNECTED</code></dt>
200      <dd>Will report false if the request has been aborted.</dd>
201    </dl>
202
203    <p>Apache returns <code>FALSE</code> to any unsupported call to
204    <code>ServerSupportFunction</code>, and sets the
205    <code>GetLastError</code> value to
206    <code>ERROR_INVALID_PARAMETER</code>.</p>
207
208    <p><code>ReadClient</code> retrieves the request body exceeding the
209    initial buffer (defined by <code class="directive"><a href="#isapireadaheadbuffer">ISAPIReadAheadBuffer</a></code>). Based on the
210    <code class="directive">ISAPIReadAheadBuffer</code> setting (number of bytes
211    to buffer prior to calling the ISAPI handler) shorter requests are sent
212    complete to the extension when it is invoked. If the request is
213    longer, the ISAPI extension must use <code>ReadClient</code> to
214    retrieve the remaining request body.</p>
215
216    <p><code>WriteClient</code> is supported, but only with the
217    <code>HSE_IO_SYNC</code> flag or no option flag (value of
218    <code>0</code>). Any other <code>WriteClient</code> request
219    will be rejected with a return value of <code>FALSE</code>, and a
220    <code>GetLastError</code> value of
221    <code>ERROR_INVALID_PARAMETER</code>.</p>
222
223    <p><code>GetServerVariable</code> is supported, although extended server
224    variables do not exist (as defined by other servers.) All the
225    usual Apache CGI environment variables are available from
226    <code>GetServerVariable</code>, as well as the <code>ALL_HTTP</code>
227    and <code>ALL_RAW</code> values.</p>
228
229    <p>Apache 2.0 <code class="module"><a href="/mod/mod_isapi.html">mod_isapi</a></code> supports additional
230    features introduced in later versions of the ISAPI specification,
231    as well as limited emulation of async I/O and the
232    <code>TransmitFile</code> semantics.  Apache also supports preloading
233    ISAPI .dlls for performance, neither of which were not available under
234    Apache 1.3 <code>mod_isapi</code>.</p>
235</div>
236<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
237<div class="directive-section"><h2><a name="ISAPIAppendLogToErrors" id="ISAPIAppendLogToErrors">ISAPIAppendLogToErrors</a> <a name="isapiappendlogtoerrors" id="isapiappendlogtoerrors">Directive</a></h2>
238<table class="directive">
239<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from
240ISAPI extensions to the error log</td></tr>
241<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToErrors on|off</code></td></tr>
242<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToErrors off</code></td></tr>
243<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
244<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
245<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
246<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
247</table>
248    <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI
249    extensions to the server error log.</p>
250
251</div>
252<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
253<div class="directive-section"><h2><a name="ISAPIAppendLogToQuery" id="ISAPIAppendLogToQuery">ISAPIAppendLogToQuery</a> <a name="isapiappendlogtoquery" id="isapiappendlogtoquery">Directive</a></h2>
254<table class="directive">
255<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from
256ISAPI extensions to the query field</td></tr>
257<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIAppendLogToQuery on|off</code></td></tr>
258<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIAppendLogToQuery on</code></td></tr>
259<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
260<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
261<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
262<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
263</table>
264    <p>Record <code>HSE_APPEND_LOG_PARAMETER</code> requests from ISAPI
265    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>
266    component).</p>
267
268</div>
269<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
270<div class="directive-section"><h2><a name="ISAPICacheFile" id="ISAPICacheFile">ISAPICacheFile</a> <a name="isapicachefile" id="isapicachefile">Directive</a></h2>
271<table class="directive">
272<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>ISAPI .dll files to be loaded at startup</td></tr>
273<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPICacheFile <var>file-path</var> [<var>file-path</var>]
274...</code></td></tr>
275<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
276<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
277<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
278</table>
279    <p>Specifies a space-separated list of file names to be loaded
280    when the Apache server is launched, and remain loaded until the
281    server is shut down. This directive may be repeated for every
282    ISAPI .dll file desired. The full path name of each file should
283    be specified. If the path name is not absolute, it will be treated
284    relative to <code class="directive"><a href="/mod/core.html#serverroot">ServerRoot</a></code>.</p>
285
286</div>
287<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
288<div class="directive-section"><h2><a name="ISAPIFakeAsync" id="ISAPIFakeAsync">ISAPIFakeAsync</a> <a name="isapifakeasync" id="isapifakeasync">Directive</a></h2>
289<table class="directive">
290<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fake asynchronous support for ISAPI callbacks</td></tr>
291<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIFakeAsync on|off</code></td></tr>
292<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIFakeAsync off</code></td></tr>
293<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
294<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
295<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
296<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
297</table>
298    <p>While set to on, asynchronous support for ISAPI callbacks is
299    simulated.</p>
300
301</div>
302<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
303<div class="directive-section"><h2><a name="ISAPILogNotSupported" id="ISAPILogNotSupported">ISAPILogNotSupported</a> <a name="isapilognotsupported" id="isapilognotsupported">Directive</a></h2>
304<table class="directive">
305<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log unsupported feature requests from ISAPI
306extensions</td></tr>
307<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPILogNotSupported on|off</code></td></tr>
308<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPILogNotSupported off</code></td></tr>
309<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
310<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
311<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
312<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
313</table>
314    <p>Logs all requests for unsupported features from ISAPI
315    extensions in the server error log. This may help administrators
316    to track down problems. Once set to on and all desired ISAPI modules
317    are functioning, it should be set back to off.</p>
318
319</div>
320<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
321<div class="directive-section"><h2><a name="ISAPIReadAheadBuffer" id="ISAPIReadAheadBuffer">ISAPIReadAheadBuffer</a> <a name="isapireadaheadbuffer" id="isapireadaheadbuffer">Directive</a></h2>
322<table class="directive">
323<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size of the Read Ahead Buffer sent to ISAPI
324extensions</td></tr>
325<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ISAPIReadAheadBuffer <var>size</var></code></td></tr>
326<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ISAPIReadAheadBuffer 49152</code></td></tr>
327<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
328<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
329<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
330<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_isapi</td></tr>
331</table>
332    <p>Defines the maximum size of the Read Ahead Buffer sent to
333    ISAPI extensions when they are initially invoked. All remaining
334    data must be retrieved using the <code>ReadClient</code> callback; some
335    ISAPI extensions may not support the <code>ReadClient</code> function.
336    Refer questions to the ISAPI extension's author.</p>
337
338</div>
339</div>
340<div class="bottomlang">
341<p><span>Available Languages: </span><a href="/en/mod/mod_isapi.html" title="English">&nbsp;en&nbsp;</a> |
342<a href="/ko/mod/mod_isapi.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
343</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&amp;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. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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