OAuth returns 403 (error 415) for url including "_"?

[padua21]

For my mobile app, I have whitelisted callback URLs like this:
“myapp-scheme://”

And my app receives 403 (error 415) by specifing callback_url like this:
“myapp-scheme://request_authorization”

However, my app doesn’t receive 403 (error 415) by specifing callback_url like this:
“myapp-scheme://request-authorization”

OAuth seems to return 403 (error 415) for url including “_”.
Is it specification?

Thanks!

[padua21]

My app uses callback_url including “_”, so users cannot sign in.
I want to solve this problem.

Any help would be appreciated.

[Connexinet]

Not sure if this will work, but you can give it a shot:
“myapp-scheme://request%5fauthorization”

[padua21]

I appreciate your advice.
If I change callback_url, it works.
But it takes time to change and release my app.
So, if this is a bug with the Twitter API, I hope it will be fixed.