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Home/ Questions/Q 3784002
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Editorial Team
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Editorial Team
Asked: May 19, 20262026-05-19T11:18:39+00:00 2026-05-19T11:18:39+00:00

I have a website running under IIS on Windows 7. Everytime the webpage requests

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I have a website running under IIS on Windows 7.
Everytime the webpage requests an XML file I receive a 400 Bad Request (diagnosed through firebug). If I request the XML file directly by typing it into my browser it works.

This not only happens for .xml file extensions but .xsl too; both of which contain XML data.

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  1. Editorial Team
    Editorial Team
    2026-05-19T11:18:39+00:00Added an answer on May 19, 2026 at 11:18 am

    I found the issue.

    When requesting the XML files I was adding the If-Modified-Since header which is in the HTTP spec but IIS on Windows 7 seems to return 400 Bad Request when this is added. Simply removing this header from the request fixes the issue.

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