The Redirect URL Validation For Applications Is Broken. Please Fix.
Fully qualified host names can be 253 bytes.
The 'Redirect URI' entry (it's really asking for a redirect URL since it needs to know the host) for a new application under 'My Apps' will not allow a valid https://<host>.<domain>/<redirect URI> unless it is quite short.
This is a valid redirect URL in the real world, but the yahoo application page disagrees.
This is a total of 93 characters.
The only URL I could get to work was this:
and that's not a valid redirect URL.. it's a short FQHN.
PLEASE FIX THIS.
The validator also locks up on Firefox and Chrome to the point that it asks if you want to stop the script from running.