IIS Does Not Return an HTTP 304 Not Modified Message for Compressed Content (307633)
The information in this article 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 "304 Not Modified" 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.
RESOLUTIONTo 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
STATUSMicrosoft has confirmed that this is a problem in IIS 5.0. This problem was first corrected in Windows 2000 Service Pack 3.
| Modification Type: | Minor | Last Reviewed: | 9/23/2005 |
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| Keywords: | kbHotfixServer kbQFE kbbug kbfix kbWin2000PreSP3Fix kbWin2000sp3fix KB307633 |
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