@Override
                public HttpServerUpgradeHandler.UpgradeCodec newUpgradeCodec(CharSequence protocol) {
                    if (AsciiString.contentEquals(Http2CodecUtil.HTTP_UPGRADE_PROTOCOL_NAME, protocol)) {
                        return new Http2ServerUpgradeCodec(new Http2ChannelHandlerBuilder(serverHandler).build());
                    } else {
                        return null;
                    }
                }
Configure the pipeline for a cleartext upgrade from HTTP to HTTP/2.0
remoting/remoting-http/src/main/java/com/alipay/sofa/rpc/transport/http/Http2ServerChannelInitializer.java