Creating Understanding and Educating Programmers, Developers and Technical Communities, one post at a time.

Friday, April 3, 2009

ISAPI Filter

ISAPI filters are DLL files that can be used to modify and enhance the functionality provided by IIS. ISAPI filters always run on an IIS server, filtering every request until they find one they need to process. The ability to examine and modify both incoming and outgoing streams of data makes ISAPI filters powerful and flexible.

Comment will be answered quickly to the reader of this post...


  1. my isapi filter is not getting loaded.
    what can be the problem. i am sure that the DLl is not getting invoked when i hit a server.

    pls help me in this regard, what went wrong.
    i restarted the web service too, but no luck.
    i used getFilterversion and onpreprocheaders procedures.


  2. Have you re-booted Server machine?