I've been bitten by this issue so many times that I have a form of amnesia where I forget that it happened all over again. This github issue highlights the problem but I'm more of a visual learner.

The problem can be traced back to configuring the redirect_uri parameter incorrectly. OAuth2 highly requires that the callbacks are identical between the server and consumer(s). For consumers that are external to the app, this is almost never a problem. For first-party consumers like Swagger(vel), this is extremely easy to configure incorrectly.

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Sep 27th 2017