private StreamingOutputCallResponse toResponse() {
            final StreamingOutputCallResponse.Builder responseBuilder =
                    StreamingOutputCallResponse.newBuilder();
            final ByteString dataBuffer = compressable ? compressableBuffer : uncompressableBuffer;
            final ByteString payload = generatePayload(dataBuffer, offset, length);
            responseBuilder.getPayloadBuilder()
                           .setType(compressable ? PayloadType.COMPRESSABLE : PayloadType.UNCOMPRESSABLE)
                           .setBody(payload);
            return responseBuilder.build();
        }
Convert this chunk into a streaming response proto.
grpc/src/test/java/com/linecorp/armeria/internal/common/grpc/TestServiceImpl.java