code: public static void releaseDataFrame(Http2SourceHandler http2SourceHandler, Http2DataFrame dataFrame) {
          int streamId = dataFrame.getStreamId();
          HttpCarbonMessage sourceReqCMsg = http2SourceHandler.getStreamIdRequestMap().get(streamId);
          if (sourceReqCMsg != null) {
              sourceReqCMsg.addHttpContent(new DefaultLastHttpContent());
              http2SourceHandler.getStreamIdRequestMap().remove(streamId);
          }
          dataFrame.getData().release();
      }
docs: Releases the {@link io.netty.buffer.ByteBuf} content.
  
  @param http2SourceHandler the HTTP2 source handler
  @param dataFrame          the HTTP2 data frame to be released