NOTES

Frame Types vs Flags and Stream ID

Table represent possible combination of frame types and flags.
Last column -- Stream ID of frame types (x -- sid >= 1, 0 -- sid = 0)


                    +-END_STREAM 0x1
                    |   +-ACK 0x1
                    |   |   +-END_HEADERS 0x4
                    |   |   |   +-PADDED 0x8
                    |   |   |   |   +-PRIORITY 0x20
                    |   |   |   |   |        +-stream id (value)
                    |   |   |   |   |        |
| frame type\flag | V | V | V | V | V |   |  V  |
| --------------- |:-:|:-:|:-:|:-:|:-:| - |:---:|
| DATA            | x |   |   | x |   |   |  x  |
| HEADERS         | x |   | x | x | x |   |  x  |
| PRIORITY        |   |   |   |   |   |   |  x  |
| RST_STREAM      |   |   |   |   |   |   |  x  |
| SETTINGS        |   | x |   |   |   |   |  0  |
| PUSH_PROMISE    |   |   | x | x |   |   |  x  |
| PING            |   | x |   |   |   |   |  0  |
| GOAWAY          |   |   |   |   |   |   |  0  |
| WINDOW_UPDATE   |   |   |   |   |   |   | 0/x |
| CONTINUATION    |   |   | x | x |   |   |  x  |