def redirect_to_twitter_auth_url
      request_token = get_request_token
    
      session[:request_token] = request_token.token
      session[:request_token_secret]= request_token.secret
    
      redirect request_token.authorize_url.gsub('authorize','authenticate')
    end
def redirect_to_twitter_auth_url
      request_token = get_request_token
    
      session[:request_token] = request_token.token
      session[:request_token_secret]= request_token.secret
    
      redirect request_token.authorize_url.gsub('authorize','authenticate')
    end
gets the request token and redirects to twitter's OAuth endpoint