class OAuthClient

def get_request_token(uri, callback = nil, param = nil)

secret = res.oauth_params['oauth_token_secret']
token = res.oauth_params['oauth_token']
res = client.get_request_token(...)
following;
successfully, you can retrieve a pair of request token and secret like
It returns a HTTP::Message instance as a response. When the request is made

param:: Additional query parameter Hash.
callback:: callback String. This can be nil for OAuth 1.0a
uri:: URI for request token.
Get request token. 
def get_request_token(uri, callback = nil, param = nil)
  oauth_config.token = nil
  oauth_config.secret = nil
  oauth_config.callback = callback
  oauth_config.verifier = nil
  res = request(oauth_config.http_method, uri, param)
  filter_response(res)
  res
end