okhttp: fix incorrect connection-level flow control handling at beginning of connection (v1.28.x backport) #6777
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…ning of connection Specifically, this addresses bugs that occur when the `OkHttpChannelBuilder.flowControlWindow(int)` setting is increased from its default value. Two changes: 1. On starting a connection, ensure the value of `OkHttpChannelBuilder.flowControlWindow(int)` is sent via Settings.INITIAL_WINDOW_SIZE. Also send a WINDOW_UPDATE after Settings to update the connection-level window. 2. Always initialize the `OutboundFlowController` with an initialWindowSize of 65335 bytes per the [http2 spec](https://http2.github.io/http2-spec/#InitialWindowSize) instead of using the inbound window size. Fixes grpc#6685
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Specifically, this addresses bugs that occur when the
OkHttpChannelBuilder.flowControlWindow(int)setting is increased from its default value.Two changes:
OkHttpChannelBuilder.flowControlWindow(int)is sent via Settings.INITIAL_WINDOW_SIZE. Also send a WINDOW_UPDATE after Settings to update the connection-level window.OutboundFlowControllerwith an initialWindowSize of 65335 bytes per the http2 spec instead of using the inbound window size.Fixes #6685
Backport of #6742.