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Isapi extensions and filters

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Raul Latashen

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Jul 14, 2003, 4:23:13 PM7/14/03
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Hello,

Can anyone tell me the difference between an ISAPI Extension and
an ISAPI Filter?

Thanks,

Raul.


Robert MacLean

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Jul 15, 2003, 2:22:49 AM7/15/03
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this is the simple version:
An isapi filter, filters what is provided to the web server (ie you can check
URL's and do things like re-directs before the server tries to process them).

an isapi extension, takes a file and processes it and provides an output to
the client. the most "famous" isapi extension is asp

Raul Latashen (ra...@reliable.com.ar) moved some electrons around and
created the following:

--

___________________________________________
Robert MacLean
robert at sadev dot co dot za
Web: http://www.sadev.co.za

DaveH

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Jul 15, 2003, 11:10:34 AM7/15/03
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A filter gets to act on a web request before an extension. It can
restructure, change, respond to or throw away the web request.

An extension gets the web request after all of the filters are finished (you
can chain multiple filters together).

Also, filters get loaded when IIS starts. Extensions get loaded when a URL
with that extension is received.

DaveH

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