cowboy Listen
##################

http请求::

  start(_Type, _Args) ->
    Dispatch = cowboy_router:compile([
        {'_', [{"/", hello_handler, []}]}
    ]),
    {ok, _} = cowboy:start_clear(my_http_listener,
        [{port, 8080}],
        #{env => #{dispatch => Dispatch}}
    ),
    hello_erlang_sup:start_link().

ssl请求::

  start(_Type, _Args) ->
    Dispatch = cowboy_router:compile([
        {'_', [{"/", hello_handler, []}]}
    ]),
    {ok, _} = cowboy:start_tls(my_http_listener,
        [
            {port, 8443},
            {certfile, "/path/to/certfile"},
            {keyfile, "/path/to/keyfile"}
        ],
        #{env => #{dispatch => Dispatch}}
    ),
    hello_erlang_sup:start_link().