Microsoft KB Archive/254337

= FIX: Internet Explorer Sends Two GET Requests for the Same Data When the MIME Handler Is an ActiveX Control =

Article ID: 254337

Article Last Modified on 5/11/2006

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APPLIES TO


 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.01 Service Pack 1
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.5

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This article was previously published under Q254337



SYMPTOMS
When an ActiveX control is registered as a Multipurpose Internet Mail Extensions (MIME) handler for a Content Type, Internet Explorer sends two GET requests for the same data.



CAUSE
When instantiating a full embedding window, URLMON and Microsoft's HTML parsing and rendering engine (MSHTML) do not properly communicate to retrieve the MIME type. To rediscover the Content Type, MSHTML generates a second GET request with the "contype" userAgent string. This is a byte-range request that MSHTML initiates as part of "data sniffing" to detect the MIME type.



Internet Explorer 5.5
To resolve this problem, obtain the latest service pack for Internet Explorer version 5.01. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

276369 How to Obtain the Latest Internet Explorer 5.5 Service Pack

Internet Explorer 5.01
To resolve this problem, obtain the latest service pack for Internet Explorer version 5.01. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

267954 How to Obtain the Latest Internet Explorer 5.01 Service Pack



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This problem was first corrected in Internet Explorer version 5.01 Service Pack 2.

This problem was first corrected in Internet Explorer version 5.5 Service Pack 1.

