Microsoft KB Archive/303677

= PRB: AddResponseHeaders and AddHeader Are Not Supported on Proxy Server =

Article ID: 303677

Article Last Modified on 7/17/2001

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APPLIES TO


 * Microsoft Proxy Server 2.0 Standard Edition

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This article was previously published under Q303677



SYMPTOMS
Normally AddResponseHeaders and AddHeader can be used in an Internet server application programming interface (ISAPI) filter to add an HTTP header to the outgoing response. However, if the ISAPI filter is installed over Proxy Server, these two functions do not work.



CAUSE
Proxy Server version 2.0 is an ISAPI extension over Internet Information Server (IIS) version 5.0, so ISAPI filters that are installed over Proxy Server 2.0 are actually installed over IIS as well. IIS allows access to HTTP response headers using AddResponseHeaders and AddHeaderonly when IIS parses the HTTP header. In the case of Proxy Server, IIS does not parse the response for performance reasons, so these functions are not called.

Additional query words: ISAPI Proxy AddResponseHeaders AddHeader

Keywords: kbprb KB303677

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