OAuth autorization error in web application

General Discussion
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1

We are trying to develop Web service, which uses Smart Things and we cannot resolve problem with authorization process. We still get the same error:

Error 500: Internal Server Error
URI /oauth/authorize
Reference Id 1aef0883-f3aa-49f9-86e2-7108da7699d4
Date Tue Sep 27 15:00:41 UTC 2016

We have created SmartThings application, enabled OAuth from the App Settings and published it to ourselves. Now, from the sevice we are trying to call:

https://graph.api.smartthings.com/oauth/confirm_access?response_type=code&client_id=<OUR_CLIENT_ID>&scope=app&redirect_uri=http://localhost

but with no success. When we try to authorize one of our locations, we always get the same error (500: Internal Server Error).
If we have understood right, after authorizing the location, we should be redirected to the page, which we set in ‘redirect_url’ param and we should get the token. But in our case, we get only error and the redirection never happens.
Could someone help us to resolve this problem?

2

A couple of things to check

Have you used an external app like postman?

Take a look at the docs here

http://docs.smartthings.com/en/latest/smartapp-web-services-developers-guide/authorization.html

Hope that helps, I would be glad to help troubleshoot with more info.