def has(self, key, from_global=None):
        return self.get(key, from_global=from_global) is not None
The value of the `Expires` header, if available.
dataset/ETHPy150Open spywhere/Javatar/core/settings.py/_Settings.has--crossover with--dataset/ETHPy150Open nigelsmall/httpstream/httpstream/http.py/Response.expires