Added comment in http2_server as well.

Author: MakMukhi

transport/http2_server.go

@@ -475,6 +475,13 @@ func (t *http2Server) handleData(f *http2.DataFrame) {
 return
 }
 // Decouple connection's flow control from application's read.
+// An update on connection's flow control should not depend on
+// whether user-applicaiton has read the data or not. Such a
+// restriction is already imposed on the stream's flow control,
+// and therefore the sender will be blocked anyways.
+// Decoupling the connection flow control will prevent other
+// active(fast) streams from starving in presence of slow or
+// inactive streams.
 if w := t.fc.onRead(uint32(size)); w > 0 {
 t.controlBuf.put(&windowUpdate{0, w})
 }