sqlmapproject/sqlmap · error · ValueError

frame header must be exactly 9 bytes

Error message

frame header must be exactly 9 bytes

What it means

Error "frame header must be exactly 9 bytes" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:285

    if not (0 <= ftype <= 0xff and 0 <= flags <= 0xff):
        raise ValueError("frame type and flags must fit in one octet")
    if not (0 <= stream_id <= MAX_STREAM_ID):
        raise ValueError("stream id must be between 0 and 2^31-1")
    if len(payload) > MAX_FRAME_SIZE:
        raise ValueError("frame payload exceeds 24-bit length")
    header = struct.pack("!I", len(payload))[1:]
    header += struct.pack("!BBI", ftype, flags, stream_id)
    return header + payload


def decode_frame_header(nine):
    """Parse a 9-byte frame header into (length, type, flags, stream_id).

    >>> decode_frame_header(encode_frame(DATA, 0, 1, b'')[:9])
    (0, 0, 0, 1)
    """
    if len(nine) != 9:
        raise ValueError("frame header must be exactly 9 bytes")
    length = struct.unpack("!I", b"\x00" + nine[:3])[0]
    ftype, flags, stream_id = struct.unpack("!BBI", nine[3:9])
    return length, ftype, flags, stream_id & MAX_STREAM_ID


# ---------- Huffman ----------
def huffman_encode(data):
    """Huffman-encode a byte string using the RFC 7541 static code.

    >>> huffman_decode(huffman_encode(b'www.example.com')) == b'www.example.com'
    True
    """
    data = _as_bytes(data)
    if not data:
        return b""
    acc = 0
    nbits = 0
    for item in bytearray(data):

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:285 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/ae5bd6a916ef1fd1. Report an issue: GitHub.