in lib/twurl/oauth_client.rb [217:226]
def generate_authorize_url
request = consumer.create_signed_request(:get, consumer.authorize_path, @request_token, pin_auth_parameters)
params = request['Authorization'].sub(/^OAuth\s+/, '').split(/,\s+/).map { |p|
k, v = p.split('=')
v =~ /"(.*?)"/
"#{k}=#{CGI.escape($1)}"
}.join('&')
"#{Twurl.options.base_url}#{request.path}?#{params}"
end