Microsoft KB Archive/307633

= IIS Does Not Return an HTTP 304 Not Modified Message for Compressed Content =

Article ID: 307633

Article Last Modified on 11/21/2006

-

APPLIES TO


 * Microsoft Internet Information Services 5.0

-



This article was previously published under Q307633



SYMPTOMS
When you use HTTP compression, Internet Information Services (IIS) sends the complete HTML page instead of responding with an HTTP status code &quot;304 Not Modified&quot; message. This occurs even if the HTML page has not been modified.



CAUSE
If a browser includes the length attribute in the GET request, IIS compares the length of the compressed page with the length that is submitted by the browser. Because the browser sends the size of the uncompressed page, IIS submits the page again.



WORKAROUND
Do not use HTTP compression.



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 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 11-Oct-2001 15:16 5.0.2195.43   337,680  Asp.dll 11-Oct-2001 15:16 5.0.2195.36   299,792  Fscfg.dll 11-Oct-2001 15:16 5.0.2195.43     8,464  Ftpctrs2.dll 11-Oct-2001 15:16 5.0.2195.43     6,416  Ftpmib.dll 11-Oct-2001 15:16 5.0.2195.43     9,488  Httpmib.dll 11-Oct-2001 15:16 5.0.2195.44    13,584  Infoadmn.dll 11-Oct-2001 15:16 5.0.2195.44   245,520  Infocomm.dll 11-Oct-2001 15:16 5.0.2195.44    62,736  Isatq.dll 30-May-2001 00:03 5.0.2195.36     3,584  Spmsg.dll 11-Oct-2001 15:16 5.0.2195.43     7,440  W3ctrs.dll 11-Oct-2001 15:16 5.0.2195.44   348,432  W3svc.dll



STATUS
Microsoft has confirmed that this is a problem in IIS 5.0. This problem was first corrected in Windows 2000 Service Pack 3.

Additional query words: kbIISCom

Keywords: kbbug kbfix kbwin2000presp3fix kbqfe kbwin2000sp3fix kbhotfixserver KB307633

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.