Fix opening office documents from webdav network mounts on windows #16739
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I tried to debug opening office documents from a webdav mounted drive on windows a bit, which prompt for credentials when opening files that are not located in the root folder. This PR at fixes the issue with Windows 10 and current Office 365.
Related previous fix #12556
The following requests happen without that patch applied and
Access log when opening a file in office
/test.docx (works)
/Demo/test.docx (doesn't work)
Office sends OPTIONS/HEAD requests before opening the document with an "Authorization: Bearer" header without a token, which causes an unauthorized response, which when checking for that seems to fix the ever showing credentials dialog. However I still don't get why the request for the file in the root would go to /remote.php/ and works because a 404 is returned 🤷♀️