Recently (as in, the last few hours - however, it may have been broken for a few days), I've been unable to login via Stack Exchange for a third party application with Stack Exchange's OAuth support. When attempting to login, I'm presented with the following error screen:

enter image description here

Transcription of the error page:

Application Login Failure

An error occurred while login into an application.

Error Details

error: invalid_request
error description: OAuth request must be over HTTPS

Note that the URL is HTTPS, and so is the redirect_uri.

I've reproduced this on two independently developed applications and on two distinct networks (my work machine, and mobile).

  • 1
    Happens on MetaSmoke (Charcoal Teams report). Commented Nov 1, 2019 at 19:25
  • Does this happen on stackoverflow.com/oauth ? Note: the docs do not use stackexchange.com :) Commented Nov 1, 2019 at 19:50
  • A tweak for this route is going out now which should resolve your issue (please report back! - I don't want to mark this status-completed until we confirm you're good). Overall, migrating to stackoverflow.com/oauth will be the supported way - we'll be removing the old stackexchange.com path eventually as part of overall infrastructure cleanup (leaving only redirects). Commented Nov 1, 2019 at 20:25
  • @Nick it’s fixed!! Thanks! Commented Nov 1, 2019 at 21:23
  • @NickCraver Oh, I hadn't noticed the documentation had changed, I'd just re-used code from a few years ago. I'll make sure to get the endpoint updated, thanks!
    – ert
    Commented Nov 2, 2019 at 4:56

1 Answer 1


This was a bug that crept in as part of the .NET Core migration (the only one I’m aware of, so close!). Sorry about that, a fix has been deployed now. Note that we’ll redirect these URLs but the preferred method in the docs is using stackoverflow.com instead as your endpoint (its a different app on our backend).

Thanks for the quick report, it’s much appreciated!

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