in src/main/java/com/twitter/http2/HttpConnection.java [178:186]
int getReceiveWindowSizeLowerBound(int streamId) {
if (streamId == HTTP_CONNECTION_STREAM_ID) {
return 0;
}
Node stream = streams.get(streamId);
StreamState state = stream == null ? null : stream.state;
return state != null ? state.getReceiveWindowSizeLowerBound() : 0;
}