Compression Is Not Enabled on POST Request

This article was previously published under Q259760
This article has been archived. It is offered "as is" and will no longer be updated.
HTTP compression allows Internet Information Services (IIS) to send compressed content to the browser when the following conditions are true:
  • The HTTP request is issued by a compression-enabled browser.
  • HTTP Compression is enabled on the IIS server for static and/or dynamic content.
  • The request is an HTTP GET request.
Even when you enable HTTP Compression, POST responses are not compressed.
This is a design limitation in IIS 5.0. A fix has been developed to enable HTTP Compression on POST requests. See the "Resolution" section for more information.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
The English version of this fix should have the following file attributes or later:
   Date        Time    Version       Size    File name     Platform   -------------------------------------------------------------   04/13/2000  10:16p  5.0.2195.2037 23312   Compfilt.dll  i386<BR/>				

Microsoft has confirmed that this is a problem in Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 2.
To enable HTTP compression on POST requests, do the following:
  1. Enable HTTP Compression (see the IIS documentation for information on how to do this.)
  2. Install the fix.
  3. Set the EnablePostCmp registry parameter to 1:
       EnablePostCmp   Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\W3Svc\Parameters   Value Type: REG_DWORD - Boolean   Valid Range: 0,1 (False or True)   Default: 0 (False)   Description: Setting this parameter to 1 causes compression to be enabled also on POST.						

Article ID: 259760 - Last Review: 10/20/2013 19:10:39 - Revision: 1.3

  • Microsoft Internet Information Services 5.0
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