The _make_handler() method was removed in this PR: #3939

But, is still used at: https://github.com/aio-libs/aiohttp/blob/master/tests/autobahn/server.py#L37

This needs updating, if anybody would like to take on this small task.

References to aiohttp.ws_connect() appear to also need updating:
https://github.com/aio-libs/aiohttp/blob/master/tests/autobahn/client.py#L9