Function parse_transfer_encoding

mitmproxy/net/http/validate.py:50–63

Parse a transfer-encoding header value, or raise a ValueError if it is invalid or unknown.

(value: str | bytes)

def parse_transfer_encoding(value: str | bytes) -> TransferEncoding:
    """Parse a transfer-encoding header value, or raise a ValueError if it is invalid or unknown."""
    # guard against .lower() transforming non-ascii to ascii
    if not value.isascii():
        raise ValueError(f"invalid transfer-encoding header: {value!r}")
    if isinstance(value, str):
        te = value
    else:
        te = value.decode()
    te = te.lower()
    te = re.sub(r"[\t ]*,[\t ]*", ",", te)
    if te not in _HTTP_1_1_TRANSFER_ENCODINGS:
        raise ValueError(f"unknown transfer-encoding header: {value!r}")
    return typing.cast(TransferEncoding, te)


def validate_headers(message: Message) -> None: