Method __delitem__

src/werkzeug/datastructures/structures.py:1181–1185

(self: te.Self, idx: t.SupportsIndex)

        return self._headers[idx]

    def __delitem__(self: te.Self, idx: t.SupportsIndex) -> None:
        rv = self._headers.pop(idx)
        self._set.remove(rv.lower())
        if self.on_update is not None:
            self.on_update(self)

    def __setitem__(self: te.Self, idx: t.SupportsIndex, value: str) -> None:
        old = self._headers[idx]