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Editorial Team
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Asked: 2026-05-25T02:36:12+00:00

I’m debugging my ASP.NET MVC 3 web app using Google Chrome Developer Tools, and

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I’m debugging my ASP.NET MVC 3 web app using Google Chrome Developer Tools, and for some reason, the error “Unexpected response code: 401” gets logged every time a page is loaded. I don’t have a clue for which request DevTools is receiving this response, though; I’ve even inspected the Networkpane in DevTools, without seeing any such response from the server. Also, the app appears to work just fine, I can’t see the 401 response having any actual effect.

How can I tell in DevTools what causes this response from the server?

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1 Answer

  1. Editorial Team

    With the network pane open, reload the page. Each row in the pane represents a different resource – you can sort the status column by clicking on it. Once you’ve found your 401, click on the page resource (the left-hand column) to see the request/response details.

    From the Wikipedia page List of HTTP status codes:

    Similar to 403 Forbidden, but specifically for use when authentication
    is possible but has failed or not yet been provided.[2] The response
    must include a WWW-Authenticate header field containing a challenge
    applicable to the requested resource

    So your root problem is that you either haven’t provided authentication details or the details provided weren’t accepted.

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