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74 lines
2.6 KiB
HTML
74 lines
2.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache module mod_isapi</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Module mod_isapi</H1>
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<P>This module is contained in the <CODE>mod_isapi.c</CODE> file, and is
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compiled in by default. It provides support for ISAPI Extensions when
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running under Microsoft Windows. Any document with a handler of
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<CODE>isapi-isa</CODE> will be processed by this module.
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<H2>Purpose</H2>
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<P>This module implements the <A
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HREF="http://www.microsoft.com/win32dev/apiext/isapimrg.htm">ISAPI
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Extension</A> API. It allows Internet Server Applications (i.e., ISAPI
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Extensions) to be used with Apache for Windows.
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<H2>Usage</H2>
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<P>In the server configuration file, add a handler called
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<CODE>isapi-isa</CODE>, and map it to files with a <CODE>.DLL</CODE>
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extension. In other words:</P>
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<PRE>
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AddHandler isapi-isa dll
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</PRE>
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<P>Now simply place the ISA DLLs into your document root, and they will
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be loaded when their URLs are accessed.</P>
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<P>ISAPI Extensions are governed by the same restrictions as CGI
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scripts. That is, <CODE>Options ExecCGI</CODE> must be active in the
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directory that contains the ISA.</P>
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<H2>Notes</H2>
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<P>Apache's ISAPI implementation conforms to all of the ISAPI 2.0
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specification, except for the "Microsoft-specific" extensions dealing
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with asynchronous I/O. Apache's I/O model does not allow asynchronous
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reading and writing in a manner that the ISAPI could access. If an ISA
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tries to access async I/O, a message will be place in the error log,
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to help with debugging.
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<P>Some servers, like Microsoft IIS, load the ISA into the server, and
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keep it loaded until memory usage is too high, and it is
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unloaded. Apache currently loads and unloads the ISA for each
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request. This is inefficient, but Apache's request model makes this
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method the only method that currently works. A future release may use
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a more effective loading method.
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<P>Apache 1.3a1 currently limits POST and PUT input to 48k per
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request. This is to work around a problem with the ISAPI implementation
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that could result in a denial of service attack. It is expected that
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support for larger uploads will be added soon.
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<P>Also, remember that while Apache supports ISAPI Extensions, it does
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not support ISAPI Filters. Support for filters may be added at a later
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date, but no support is planned at this time.</P>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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