OAuth2 Redirect Url

Question

Hello there,&nbsp;For the Oauth2 bewlowhttps://api.dropbox.com/1/oauth2/authorize?response_type=code&amp;client_id=zzzzzzzzzzz&amp;redirect_uri=https://localhost:44332/Login?Cloud=DROP&amp;ClientId=393903&nbsp;It is saying ClientId is invalid.&nbsp;The app has the same redirect url:&nbsp;https://localhost:44332/Login?Cloud=DROP&amp;ClientId=393903&nbsp;Could you please advise wether it is possible to add extra parameters and only the first one is accepted (Cloud) so far.&nbsp;Error is:More details for developersunknown field "ClientId"&nbsp;Please let me know!&nbsp;Thanks

Greg-DB · Answer

It sounds like you're not URL encoding the 'redirect_uri' value, and so the URL parameters on your redirect URI are being sent as actual URL parameters to the Dropbox /oauth2/authorize app authorization page itself, which does not expect those parameters.
&nbsp;
You'll need to URL encode your 'redirect_uri' value. For example, for the sample you included here, that would be:
&nbsp;
https%3A%2F%2Flocalhost%3A44332%2FLogin%3FCloud%3DDROP%26ClientId%3D393903

&nbsp;
Also, note that per the documentation, the app authorization page should be accessed at&nbsp;https://www.dropbox.com/oauth2/authorize (not on&nbsp;api.dropbox.com).

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OAuth2 Redirect Url

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