# "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
CLIENT_CONNECTION_PREFACE = '505249202a20485454502f322e300d0a0d0a534d0d0a0d0a'

ERROR_CODES = utils.BiDi(
    NO_ERROR=0x0,
    PROTOCOL_ERROR=0x1,
    INTERNAL_ERROR=0x2,
    FLOW_CONTROL_ERROR=0x3,
    SETTINGS_TIMEOUT=0x4,
    STREAM_CLOSED=0x5,
    FRAME_SIZE_ERROR=0x6,
    REFUSED_STREAM=0x7,
    CANCEL=0x8,
    COMPRESSION_ERROR=0x9,
    CONNECT_ERROR=0xa,
    ENHANCE_YOUR_CALM=0xb,
    INADEQUATE_SECURITY=0xc,
    HTTP_1_1_REQUIRED=0xd
)