# File lib/faraday_middleware/request/oauth2.rb, line 32
    def call(env)
      params = { param_name => @token }.update query_params(env[:url])

      if token = params[param_name] and !token.empty?
        env[:url].query = build_query params
        env[:request_headers][AUTH_HEADER] ||= %(Token token="#{token}")
      end

      @app.call env
    end