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What is ISAPI?

Answer:

ISAPI stands for Internet ServerApplication Programming Interface, is a specification that allows developers to extend IIS by writing components that proces raw HTTP requests.

An ISAPI components ends up as DLL that IIS directs all requests and responses through.

In ASP.Net ISAPI component has been evovled into httpHandler.

ISAPI can be written only in C++, wherein httpHandler can be written using any .Net compatible language.

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