code: public com.google.protobuf.ByteString
        getRequestUrlBytes() {
      java.lang.Object ref = requestUrl_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        requestUrl_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
docs: <pre>
  The scheme (http, https), the host name, the path and the query
  portion of the URL that was requested.
  Example: `"http://example.com/some/info?color=red"`.
  </pre>
  
  <code>string request_url = 2;</code>