sqlmapproject/sqlmap · error · H2ProtocolError

peer advertised an invalid maximum frame size

Error message

peer advertised an invalid maximum frame size

What it means

Error "peer advertised an invalid maximum frame size" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:774

    _validate_pseudo_value(":authority", authority)
    if method == b"CONNECT":
        request = [(b":method", method), (b":authority", authority)]
    else:
        if not path:
            raise H2ProtocolError("non-CONNECT requests require a non-empty :path")
        _validate_pseudo_value(":path", path)
        request = [(b":method", method), (b":scheme", b"https"), (b":path", path), (b":authority", authority)]
    request.extend(_normalize_request_headers(headers, body))
    return request


def _field_section_size(headers):
    return sum(32 + len(name) + len(value) for name, value in headers)


def _header_frames(stream_id, block, max_frame_size, end_stream):
    if max_frame_size < DEFAULT_MAX_FRAME_SIZE:
        raise H2ProtocolError("peer advertised an invalid maximum frame size")
    if not block:
        return [encode_frame(HEADERS, FLAG_END_HEADERS | (FLAG_END_STREAM if end_stream else 0), stream_id, b"")]
    frames = []
    pos = 0
    first = True
    while pos < len(block):
        chunk = block[pos:pos + max_frame_size]
        pos += len(chunk)
        final = pos == len(block)
        if first:
            flags = (FLAG_END_STREAM if end_stream else 0) | (FLAG_END_HEADERS if final else 0)
            frames.append(encode_frame(HEADERS, flags, stream_id, chunk))
            first = False
        else:
            flags = FLAG_END_HEADERS if final else 0
            frames.append(encode_frame(CONTINUATION, flags, stream_id, chunk))
    return frames

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:774 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/e16741c69aecd3c1. Report an issue: GitHub.