public com.google.protobuf.ByteString
        getUrlBytes() {
      Object ref = url_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        url_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<code>string url = 1;</code>
@return The bytes for url.
examples/client/src/main/java/com/clickhouse/examples/protos/UIEvent.java