Compression Is Not Enabled on POST Request

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This article was previously published under Q259760

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SYMPTOMS

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.

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CAUSE

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.

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RESOLUTION

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 the Microsoft Knowledge Base:

260910 (http://support.microsoft.com/kb/260910/EN-US/ ) 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/>

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STATUS

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.

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MORE INFORMATION

To enable HTTP compression on POST requests, do the following:

Enable HTTP Compression (see the IIS documentation for information on how to do this.)
Install the fix.

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.

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APPLIES TO

Microsoft Internet Information Services 5.0

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kbhotfixserver kbqfe kbbug kbfix KB259760

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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