``httptester`` is a docker container used to host certain resources required by :ref:`testing_integration`. This is to avoid CI tests requiring external resources (such as git or package repos) which, if temporarily unavailable, would cause tests to fail.
If you have sometime to improve ``httptester`` please add a comment on the `Testing Working Group Agenda <https://github.com/ansible/community/blob/master/meetings/README.md>`_ to avoid duplicated effort.