Method from_header

src/werkzeug/datastructures/auth.py:271–291

Parse a ``WWW-Authenticate`` header value and return an instance, or ``None`` if the value is empty. :param value: The header value to parse. .. versionadded:: 2.3

(cls, value: str | None)

    @classmethod
    def from_header(cls, value: str | None) -> te.Self | None:
        class="st">"""Parse a ``WWW-Authenticate`` header value and return an instance, or ``None``
        if the value is empty.

        :param value: The header value to parse.

        .. versionadded:: 2.3
        class="st">"""
        if not value:
            return None

        scheme, _, rest = value.partition(class="st">" ")
        scheme = scheme.lower()
        rest = rest.strip()

        if class="st">"=" in rest.rstrip(class="st">"="):
            class="cm"># = that is not trailing, this is parameters.
            return cls(scheme, parse_dict_header(rest), None)

        class="cm"># No = or only trailing =, this is a token.
        return cls(scheme, None, rest)

    def to_header(self) -> str:
        class="st">""class="st">"Produce a ``WWW-Authenticate`` header value representing this data."class="st">""