simple_http_server is nowhere to be found

[wimglenn]

https://github.com/man-group/pytest-plugins/tree/master/pytest-server-fixtures#simple-http-server

It does not show in pytest --fixtures and tests using this fixture get error

E       fixture 'simple_http_server' not found

There is one called simple_http_test_server in the source: https://github.com/man-group/pytest-plugins/blob/v1.7.0/pytest-server-fixtures/pytest_server_fixtures/http.py#L22-L28

However it is not found either, presumably because nothing in the entry points refers to that http.py submodule.