fixed

                // advance and a permanently-stalled upstream spun forever.

                ++ss->emptyCount;

                if (ss->emptyCount > 500) {

                    // Genuine stall — send END_STREAM

                    out += h2BuildFrame(H2_FRAME_DATA, H2_FLAG_END_STREAM, sid, "");

                    // Genuine stall with the response short of the

                    // advertised Content-Length. Sending END_STREAM here

                    // would make the client accept a truncated body as

                    // complete (e.g. a corrupted image). Abort the stream

                    // instead so the client sees a failed transfer.

                    uint8_t rst[4] = {0, 0, 0, 0x02}; // INTERNAL_ERROR

                    out += h2BuildFrame(H2_FRAME_RST_STREAM, 0, sid,

                        std::string(reinterpret_cast<char*>(rst), 4));

                    cureq.h2state().peerStreamWindows.erase(sid);

                    streams.erase(it);

                } else {