Intermittent HTTP/2 failure with h2spec (6.10.)

  6.10. CONTINUATION
    × Sends a CONTINUATION frame after the frame other than HEADERS, PUSH_PROMISE or CONTINUATION
      - The endpoint MUST treat as a connection error of type PROTOCOL_ERROR.
        Expected: GOAWAY frame (ErrorCode: PROTOCOL_ERROR)
                  Connection close
          Actual: GOAWAY frame (Length: 8, Flags: 0, ErrorCode: STREAM_CLOSED)