Microsoft KB Archive/160013

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Two Hits on Server Per POST Request on Internet Explorer

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Q160013

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The information in this article applies to:


 * Microsoft Internet Explorer versions 2.0, 3.0, 3.01, 3.02, 4.0 for Windows 95

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SYMPTOMS
If a CGI application returns a MIME Type that is unknown or not associated to Internet Explorer internally, Internet Explorer makes two POST requests to the server.

CAUSE
When the result of a POST request is processed, Internet Explorer first looks at the MIME type returned in the HTTP header. If this is not recognized by Internet Explorer or the application is external to Internet Explorer, Internet Explorer discards the response to the first POST request and initiates a second POST request.

For example, if you use the following HTML code to define a form

  POST Request    and Iistest.exe is a CGI application that returns the following HTTP header and body

  Content-type: text/unknown

This is normal text a trace would show two POST requests made to the server. Internet Explorer incorrectly assumes that the CGI application returns the same information for both requests.

STATUS
Microsoft has confirmed this to be a problem in the products listed at the top of this article.

Additional query words:

Keywords : kbnetwork

Issue type : kbbug

Technology : kbIEsearch kbIE95Search kbZNotKeyword3 kbIE200Win95 kbIE300Win95 kbIE301Win95 kbIE302Win95 kbIE400Win95