KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q259760: Compression Is Not Enabled on POST Request

Article: Q259760
Product(s): Internet Information Server
Version(s): winnt:5.0
Operating System(s): 
Keyword(s): kbWin2000SP2Fix
Last Modified: 13-JUN-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
-------------------------------------------------------------------------------

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.

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.

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:

  Q260910 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/>


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.

MORE INFORMATION
================

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.


Additional query words:

======================================================================
Keywords          : kbWin2000SP2Fix 
Technology        : kbiisSearch kbiis500
Version           : winnt:5.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.