I'm converting a twitter client from basic auth to xauth and everything is working fine except I have been unable to generate an oAuth token using xauth if the user attempts to sign in with an email address instead of their Twitter username.
Is a Twitter user's email address a valid value for an xAuth x_auth_username parameter? And if so, is there anything about the encoding that's odd? I've tried the various obvious forms of HTTP value escaping but with no luck so far. It would be really nice to see something like the access_token page's Example Signature Base String that uses an email address (if that is even supported?) successfully. Thanks in advance.
