code: def get_header(self, name, default=None):
          ''' Return the value of a previously defined header. If there is no
              header with that name, return a default value. '''
          return self._headers.get(_hkey(name), [default])[-1f get_header(self, name, default=None):
          ''' Return the value of a previously defined header. If there is no
              header with that name, return a default value. '''
          return self._headers.get(_hkey(name), [default])[-1]
docs: Return the value of a previously defined header. If there is no
              header with that name, return a default value.