Unable to set correct localhost URL for Facebook webpage in developer console

Question

Since last week I am unable to test my OAuth login using facebook because of this troubling bug - I am unable to set correct site url using localhost. When I'm trying to use this address:

http://localhost:9000/

inside developers.facebook.com settings I receive info:

we're sorry but something went wrong

And my changes aren't saved. I am able to use localhost address with "www" prefix, but obviously it doesn't work for my app since I need to use bare "localhost" with port. Any ideas?

Answer 1

It seems that sometimes Facebook has problems with generated apps' settings. After deleting application and creating another one, I was able to correctly set website URL to http://localhost:9000. It looks that it was indeterministic behavior.