sqlmapproject/sqlmap · error · H2ProtocolError

HTTP/2 field values may not have leading/trailing whitespace

Error message

HTTP/2 field values may not have leading/trailing whitespace

What it means

Error "HTTP/2 field values may not have leading/trailing whitespace" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/request/http2.py:687

        return []
    if hasattr(headers, "items"):
        return list(headers.items())
    return list(headers)


def _validate_regular_name(name):
    if not name or name.startswith(b":"):
        raise H2ProtocolError("invalid regular field name")
    for item in bytearray(name):
        if item not in _TOKEN_BYTES:
            raise H2ProtocolError("invalid HTTP field name %r" % name)


def _validate_field_value(value):
    if b"\x00" in value or b"\r" in value or b"\n" in value:
        raise H2ProtocolError("invalid control character in HTTP field value")
    if value[:1] in (b" ", b"\t") or value[-1:] in (b" ", b"\t"):
        raise H2ProtocolError("HTTP/2 field values may not have leading/trailing whitespace")


def _validate_pseudo_value(name, value):
    _validate_field_value(value)
    for item in bytearray(value):
        if item < 0x21 or item > 0x7e:
            raise H2ProtocolError("invalid octet in %s pseudo-field" % name)


def _validate_method(method):
    if not method:
        raise H2ProtocolError("method is required")
    for item in bytearray(method):
        if item not in _METHOD_TOKEN_BYTES:
            raise H2ProtocolError("invalid HTTP method token")


def _normalize_request_headers(headers, body):

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/request/http2.py:687 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/0236e5c2da2d5849. Report an issue: GitHub.