sqlmapproject/sqlmap · error · H2ProtocolError

content-length is not permitted in trailers

Error message

content-length is not permitted in trailers

What it means

Error "content-length is not permitted in trailers" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:842

def _extract_data(flags, payload):
    if not (flags & FLAG_PADDED):
        return payload
    if not payload:
        raise H2ProtocolError("padded DATA frame has no pad length")
    pad_length = bytearray(payload)[0]
    if pad_length > len(payload) - 1:
        raise H2ProtocolError("DATA padding exceeds frame payload")
    return payload[1:len(payload) - pad_length]


def _parse_content_length(headers, trailers=False):
    values = []
    for name, value in headers:
        if _as_bytes(name).lower() != b"content-length":
            continue
        if trailers:
            raise H2ProtocolError("content-length is not permitted in trailers")
        for part in _as_bytes(value).split(b","):
            part = part.strip()
            if not part or not part.isdigit():
                raise H2ProtocolError("invalid content-length field")
            values.append(int(part))
    if not values:
        return None
    expected = values[0]
    if any(value != expected for value in values[1:]):
        raise H2ProtocolError("conflicting content-length fields")
    return expected


def _validate_response_field_section(headers, trailers=False):
    regular_seen = False
    status = None
    for name, value in headers:
        name = _as_bytes(name)

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:842 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/777bf5118bf2c6bf. Report an issue: GitHub.