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  |