On Thu, 18 Nov 2021, Kunal Ekawde via curl-library wrote:

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 ?

I can't find a reasonable explanation for that. It needs to be debugged/investigated I think. Add trace-points and debug output in the code and monitor/compare what wireshark and the server side think of the connection.

Maybe related to issue #7977: https://github.com/curl/curl/issues/7977 ?

libcurl sending more amount of DATA frames crossing WINDOW_UPDATE specified by server ?

I don't understand this question, Can you elaborate?

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