- run_app and the Command Line Interface now support serving over Unix domain sockets for faster inter-process communication.
- Added capacity parameter for client connector object. Capacity is the total number of simultaneous connections. #1601
- Deprecate connector's limit parameter #1601
- Dropped: aiohttp.protocol.HttpPrefixParser #1590
- Dropped: Servers response's .started, .start() and .can_start() method #1591
- Dropped: Adding sub app via app.router.add_subapp() is deprecated use app.add_subapp() instead #1592
- Dropped: Application.finish() and Application.register_on_finish() #1602
- Dropped: aiohttp.get(), aiohttp.options(), aiohttp.head(), aiohttp.post(), aiohttp.put(), aiohttp.patch(), aiohttp.delete(), and aiohttp.ws_connect() #1593
- Dropped: aiohttp.web.WebSocketResponse.receive_msg() #1605
- Dropped: ServerHttpProtocol.keep_alive_timeout attribute and keep-alive, keep_alive_on, timeout, log constructor parameters #1606
- Dropped: TCPConnector's` .resolve, .resolved_hosts, .clear_resolved_hosts() attributes and resolve constructor parameter #1607
- Dropped ProxyConnector #1609