I am requesting this url with fiddler: http://sitecollectionUrl/_api/web

With the header of:

Accept:   application/json;odata=verbose

But I am getting 401 error code when doing so. I am on SharePoint Server 2013.

  • 1
    Have you checked Automatically Authenticate option or you have key in the Authorization in header?
    – Mark L
    Commented Dec 16, 2015 at 2:21
  • How do I check the authentication automatically? No I don't have a header for authentication. Commented Dec 16, 2015 at 6:06
  • Thank you Mark, I found the automate authentication, and it worked. Please add it as answer so I can mark it :) thank you a lot Commented Dec 16, 2015 at 6:11

1 Answer 1


You can enable the Automatically Authenticate option in Fiddler. It will use your current Windows logon account to send the request.

The option can be found under Composer tab > Options tab


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