HTTP/1.1 upgrade to H2C cannot process fully request entity with a size greater than the initial window size #4802
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When the server upgrades an HTTP/1.1 connection to H2C, it forwards inbound HTTP messages to the H2 encoder and updates the frame controller with the received amount of bytes. Actually such messages are not taken in account by the H2 flow controller and therefore when the window size becomes zero, it will not process message anymore.
This impacts HTTP/1.1 upgrades to H2C sending messages payload greater than the flow control window size.