Though this will become public, the implied interface is not yet stable.
There are no base classes.
There are no implemented interfaces.
There are no attributes in this class.
add(request, response)
back(n, _response)
clear()
close()
>>> history = History() >>> history.close()
Under some circumstances response can be None, in that case this method should not raise an exception.
>>> history.add(None, None) >>> history.close()
There are no known subclasses.