When trying to generate an OAuth request token, I kept getting a 401 Unauthorized error with moomerman’s twitter_oauth gem. So I decided to switch to John Nunemaker’s Twitter gem.
This brought about another problem: even if I specified that my Twitter application was web-based and set a callback URL in the app. settings, Twitter kept using the OAuth PIN-based authentication method; I wanted the callback! The fix involved adding the 
auth_callback parameter to the Twitter::OAuth class, which then gets sent along with the get_request_token() call.
Here’s the monkey-patch:
module Twitter
class OAuth
def initialize(ctoken, csecret, options={})
@ctoken, @csecret, @consumer_options = ctoken, csecret, options
if options[:sign_in]
@consumer_options[:authorize_path] = '/oauth/authenticate'
end
end
def request_token
@request_token ||= consumer.get_request_token(@consumer_options)
end
end
end
I’ll go ahead and slap the old “it works for me” disclaimer on this one. =]
