Hi! We are observing this during a performance test and with data size in order of 30kb - if data size is reduced to 10kb, this is not seen.
1) DATA frame is transmitted over a long period for a stream -- As wireshark displays it "Reassembled body in frame: xxxx". The first part of DATA is transmitted at X and remaining at X+5th second. https://user-images.githubusercontent.com/4777551/142235817-75e777fd-de5e-46d1-89e2-9d6ff8c8516c.png As can be seen from capture, libcurl is sending: HEADERS - 13:25:55 DATA (5kb) - 13:25:55 DATA (9kb) - 13:26:00 RST_STREAM - 13:26:00 At the server, since DATA is not complete at 13:25:55, it cannot process until balance DATA is transmitted. Any pointer as to why / in which conditions, libcurl can delay sending the DATA packets ? 2) libcurl sending more amount of DATA frames crossing WINDOW_UPDATE specified by server ? https://user-images.githubusercontent.com/4777551/142262873-869a28a8-8f39-442c-b942-c98c9e37ed56.png Additional Information: 1. It's a PATCH request and data is provided to libcurl using readcallback which copies the entire buffer. 2. libcurl version 7.80.0 , nghttp2 version - 1.460 Thanks -- ~Kunal -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html
