def __delitem__(self,name):
        name = name.lower()
        self._headers[:] = [kv for kv in self._headers if kv[0].lower()<>name]
Delete all occurrences of a header, if present.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/core/servers/basehttp.py/Headers.__delitem__