Google Oauth 2.0 redirect_uri_mismatch - Port changed on callback

Question

I'm using Google.Apis.Auth.OAuth2.GoogleWebAuthorizationBroker.AuthorizeAsync() to authenticated a Google account, the problems is that Google returns a 400 error after I've logged into my Google account:

The redirect URI in the request: http://localhost:40745/authorize/ did not match a registered redirect URI.

But my mvc application runs at 46423, also the Redirect URI is set to http://localhost:46423/authorize/ in the dev console. What am I missing?

I don't know. I can't see anything. Without any code it's hard to say — last10seconds, Jul 14 '15 at 18:25
Turns out I was using the wrong application type in my setup in Google dev console. When I changed to "Installed application" I got the right callback url from google. — Martin Lindgren, Jul 14 '15 at 20:33

score 11 · Accepted Answer · edited Aug 09 '17 at 08:12

11

The redirect URI changes each time you debug. You should add http://localhost/authorize/ to your redirect URI list in the Credential page.

edited Aug 09 '17 at 08:12

Martin Lindgren

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answered Sep 30 '16 at 19:41

Ilan Olkies

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Thank you very much, this works for my but with localhost/Callback – Valfar Developer Oct 26 '17 at 19:50
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I had to use `http://127.0.0.1/authorize/` but other than that it worked like a charm! – George Helyar Dec 06 '18 at 08:35
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This doesn't help because the port is randomized each time, and Google won't accept it without the port included. – Meekohi Oct 12 '20 at 14:37
Unbelievably, this works with a trailing slash, but not without, regardless of port. – Mmm Apr 25 '22 at 21:16

score 2 · Answer 2 · answered Mar 08 '23 at 23:51

The problem is at the line flow.run_local_server(port=0) of the quickstart.py file.

When port=0, the operating system will dynamically assign an available port number, which is useful in cases where the default port is already in use by another process. So you need to change this to say for example flow.run_local_server(port=8000) and register in the credentials page.

Google Oauth 2.0 redirect_uri_mismatch - Port changed on callback

2 Answers2

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