Как вы используете Gun в качестве клиента Cowboy?

Я выполнил инструкции по началу работы для Cowboy и заставил Cowboy работать и прослушивать порт 8080, и я получил ответ Hello Erlang!, когда ввел http://localhost:8080 в моем браузере. Теперь, как мне использовать Gun для подключения к Cowboy?

Я прочитал оружейные документы, и это говорит, чтобы добавить "Gun как зависимость erlang.mk". Итак, я скачал erlang.mk:

~/erlang_programs/my_gun$ curl -O https://erlang.mk/erlang.mk

и следуя Руководству пользователя Erlang.mk, я создал приложение:

~/erlang_programs/my_gun$ gmake -f erlang.mk bootstrap

Затем я добавил пистолет как зависимость к Makefile:

PROJECT = my_gun
PROJECT_DESCRIPTION = New project
PROJECT_VERSION = 0.1.0

DEPS = gun

include erlang.mk

Затем я скомпилировал:

~/erlang_programs/my_gun$ gmake
gmake[1]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
 ERLC   cow_cookie.erl cow_date.erl cow_hpack.erl cow_http.erl cow_http2.erl cow_http_hd.erl cow_http_te.erl cow_mimetypes.erl cow_multipart.erl cow_qs.erl cow_spdy.erl cow_sse.erl cow_uri.erl cow_ws.erl
 APP    cowlib
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
 DEPEND ranch.d
 ERLC   ranch.erl ranch_acceptor.erl ranch_acceptors_sup.erl ranch_app.erl ranch_conns_sup.erl ranch_listener_sup.erl ranch_protocol.erl ranch_server.erl ranch_ssl.erl ranch_sup.erl ranch_tcp.erl ranch_transport.erl
 APP    ranch
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
 DEPEND gun.d
 ERLC   gun.erl gun_app.erl gun_content_handler.erl gun_data.erl gun_http.erl gun_http2.erl gun_spdy.erl gun_sse.erl gun_sup.erl gun_ws.erl gun_ws_handler.erl
 APP    gun
 GEN    rebar.config
gmake[1]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
 DEPEND my_gun.d
 ERLC   my_gun_app.erl my_gun_sup.erl
 APP    my_gun
 GEN    /Users/7stud/erlang_programs/my_gun/.erlang.mk/relx
===> Starting relx build process ...
===> Resolving OTP Applications from directories:
          /Users/7stud/erlang_programs/my_gun/ebin
          /Users/7stud/erlang_programs/my_gun/deps
          /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang/lib
          /Users/7stud/erlang_programs/my_gun/apps
===> Resolved my_gun_release-1
===> rendering builtin_hook_status hook to "/Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/bin/hooks/builtin/status"
===> Including Erts from /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang
===> release successfully created!
===> tarball /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/my_gun_release-1.tar.gz successfully created!

Но когда я переключаюсь на оболочку erlang и пытаюсь запустить пушку, я получаю сообщение об ошибке:

~/erlang_programs/my_gun$ erl
Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] 

Eshell V8.2  (abort with ^G)

1> application:ensure_all_started(gun).
{error,{gun,{"no such file or directory","gun.app"}}}

Может ли кто-нибудь опубликовать простой пример использования Gun (или любого другого http-клиента с поддержкой веб-сокетов) для подключения к Cowboy?

Хорошо, я добился некоторого прогресса. Я удалил каталог my_gun, воссоздал каталог, повторно загрузил erlang.mk и создал выпуск со следующим команда:

~/erlang_programs/my_gun$ gmake -f erlang.mk bootstrap-lib bootstrap-rel

Затем я добавил зависимость от пушки в Makefile (как описано выше). Тогда я сделал:

 ~/erlang_programs/my_gun$ gmake run

Если в коде ошибок нет, то запустится оболочка erlang. В оболочке erlang я ввел следующий код (см. tip ниже, чтобы не вводить весь код в оболочке):

([email protected])1> application:ensure_all_started(gun).
{ok,[]}

([email protected])2> {ok, ConnPid} = gun:open("localhost", 8080).  

=PROGRESS REPORT==== 10-Jul-2017::05:21:58 ===
          supervisor: {local,inet_gethost_native_sup}
             started: [{pid,<0.366.0>},{mfa,{inet_gethost_native,init,[[]]}}]
{ok,<0.364.0>}

=PROGRESS REPORT==== 10-Jul-2017::05:21:58 ===
          supervisor: {local,kernel_safe_sup}
             started: [{pid,<0.365.0>},
                       {id,inet_gethost_native_sup},
                       {mfargs,{inet_gethost_native,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,1000},
                       {child_type,worker}]

([email protected])3> {ok, Protocol} = gun:await_up(ConnPid).
{ok,http}

([email protected])4> gun:ws_upgrade(ConnPid, "/websocket").
#Ref<0.0.3.244>

([email protected])5> receive                                          
([email protected])5> {gun_ws_upgrade, ConnPid, ok, Headers} ->        
([email protected])5> upgrade_success(ConnPid);
([email protected])5> {gun_response, ConnPid, _, _, Status, Headers} ->
([email protected])5> exit({ws_upgrade_failed, Status, Headers});
([email protected])5> {gun_error, ConnPid, StreamRef, Reason} ->
([email protected])5> exit({ws_upgrade_failed, Reason})
([email protected])5> after 1000 ->
([email protected])5> exit(timeout)
([email protected])5> end.

=CRASH REPORT==== 10-Jul-2017::05:25:17 ===
  crasher:
    initial call: gun:proc_lib_hack/5
    pid: <0.364.0>
    registered_name: []
    exception exit: {{owner_gone,normal},
                     [{gun,loop,1,[{file,"src/gun.erl"},{line,706}]},
                      {gun,proc_lib_hack,5,[{file,"src/gun.erl"},{line,535}]},
                      {proc_lib,init_p_do_apply,3,
                                [{file,"proc_lib.erl"},{line,247}]}]}
      in function  gun:proc_lib_hack/5 (src/gun.erl, line 540)
    ancestors: [gun_sup,<0.343.0>]
    messages: []
    links: [<0.344.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 2586
    stack_size: 27
    reductions: 10857
  neighbours:

=SUPERVISOR REPORT==== 10-Jul-2017::05:25:17 ===
     Supervisor: {local,gun_sup}
     Context:    child_terminated
     Reason:     {{owner_gone,normal},
                  [{gun,loop,1,[{file,"src/gun.erl"},{line,706}]},
                   {gun,proc_lib_hack,5,[{file,"src/gun.erl"},{line,535}]},
                   {proc_lib,init_p_do_apply,3,
                             [{file,"proc_lib.erl"},{line,247}]}]}
     Offender:   [{pid,<0.364.0>},
                  {id,gun},
                  {mfargs,{gun,start_link,undefined}},
                  {restart_type,temporary},
                  {shutdown,5000},
                  {child_type,worker}]

** exception exit: {ws_upgrade_failed,404,
                                      [{<<"content-length">>,<<"0">>},
                                       {<<"date">>,
                                        <<"Mon, 10 Jul 2017 11:22:38 GMT">>},
                                       {<<"server">>,<<"Cowboy">>}]}
([email protected])6> 

Теперь я получаю ошибку 404. Ковбой бежит, и когда я ввожу http://localhost:8080 in my browser, я вижу ответное сообщение. Почему Gun выдает ошибку 404?

Затем я попытался использовать инструкции из Gun docs, чтобы создать ПОЛУЧИТЬ запрос:

StreamRef = gun:get(ConnPid, "/").

case gun:await(ConnPid, StreamRef) of
    {response, fin, Status, Headers} ->
        no_data;
    {response, nofin, Status, Headers} ->
        {ok, Body} = gun:await_body(ConnPid, StreamRef),
        io:format("~s~n", [Body])
end.

и это было успешно:

=PROGRESS REPORT==== 10-Jul-2017::06:36:14 ===
          supervisor: {local,inet_gethost_native_sup}
             started: [{pid,<0.367.0>},{mfa,{inet_gethost_native,init,[[]]}}]

=PROGRESS REPORT==== 10-Jul-2017::06:36:14 ===
          supervisor: {local,kernel_safe_sup}
             started: [{pid,<0.366.0>},
                       {id,inet_gethost_native_sup},
                       {mfargs,{inet_gethost_native,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,1000},
                       {child_type,worker}]
Hello Erlang!
ok
([email protected])2> 

Ответ означает, что я смог использовать Gun для взаимодействия с сервером Cowboy, но я хочу использовать веб-сокеты. Есть идеи, что я делаю неправильно?

tip:

Чтобы не вводить весь этот код в оболочку пистолета, я создал файл ~/erlang_programs/my_gun/src/my.erl:

-module(my).
-compile(export_all).

get() ->
    {ok, _} = application:ensure_all_started(gun),
    {ok, ConnPid} = gun:open("localhost", 8080),
    {ok, _Protocol} = gun:await_up(ConnPid),

    StreamRef = gun:get(ConnPid, "/"),

    case gun:await(ConnPid, StreamRef) of
        {response, fin, _Status, _Headers} ->
            no_data;
        {response, nofin, _Status, _Headers} ->
            {ok, Body} = gun:await_body(ConnPid, StreamRef),
            io:format("~s~n", [Body])
    end.

ws() ->

    {ok, _} = application:ensure_all_started(gun),
    {ok, ConnPid} = gun:open("localhost", 8080),
    {ok, _Protocol} = gun:await_up(ConnPid),

    gun:ws_upgrade(ConnPid, "/websocket"),

    receive
    {gun_ws_upgrade, ConnPid, ok, Headers} ->
            upgrade_success(ConnPid, Headers);
    {gun_response, ConnPid, _, _, Status, Headers} ->
            exit({ws_upgrade_failed, Status, Headers});
    {gun_error, _ConnPid, _StreamRef, Reason} ->
            exit({ws_upgrade_failed, Reason})
    %% More clauses here as needed.
    after 1000 ->
        exit(timeout)
    end,

    gun:shutdown(ConnPid).


upgrade_success(ConnPid, Headers) ->
    io:format("Upgraded ~w. Success!~nHeaders:~n~p~n", 
              [ConnPid, Headers]).

Затем команда make (или gmake):

 ~/erlang_programs/my_gun$ gmake run

скомпилирует все в каталоге src/ и предупредит вас о любых ошибках. После успешного запуска снаряда в ответ на gmake run вы можете, например, сделать:

([email protected])1> my:get().

=PROGRESS REPORT==== 10-Jul-2017::06:36:14 ===
          supervisor: {local,inet_gethost_native_sup}
             started: [{pid,<0.367.0>},{mfa,{inet_gethost_native,init,[[]]}}]

=PROGRESS REPORT==== 10-Jul-2017::06:36:14 ===
          supervisor: {local,kernel_safe_sup}
             started: [{pid,<0.366.0>},
                       {id,inet_gethost_native_sup},
                       {mfargs,{inet_gethost_native,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,1000},
                       {child_type,worker}]
Hello Erlang!
ok
([email protected])2> 

Ответ на комментарий:

Поскольку вы получаете 404, я полагаю, у вас нет обработчика веб-сокета, определенного в ковбойских маршрутах.

Ты прав. У меня был только обработчик, показанный в руководстве «Начало работы с Ковбоями». Теперь я добавил код настройки веб-сокета и обработчик веб-сокета в cowboy. Теперь у меня есть маршруты:

hello_erlang_app.erl:

-module(hello_erlang_app).
-behaviour(application).

-export([start/2]).
-export([stop/1]).

start(_Type, _Args) ->
    Dispatch = cowboy_router:compile([
        {'_', [{"/", hello_handler, []}] },
        {'_', [{"/websocket", myws_handler, []}] }
    ]),

    {ok, _} = cowboy:start_clear(my_http_listener,
        [{port, 8080}],
        #{env => #{dispatch => Dispatch} }
    ),

    hello_erlang_sup:start_link().

stop(_State) ->
    ok.

Вот мой обработчик:

-module(myws_handler).
-compile(export_all).

init(Req, State) ->
    {cowboy_websocket, Req, State}.  %Perform websocket setup

websocket_handle({text, Msg}, State) ->
    {
     reply, 
     {text, <<"Server received: ", Msg/binary>>, State}  %%Error in format here, too!
    };
websocket_handle(_Data, State) ->
    {ok, State}.

Но я все еще получаю ошибку 404, когда выполняю my:ws() в оболочке пистолета:

-module(my).
-compile(export_all).

get() ->
    {ok, _} = application:ensure_all_started(gun),
    {ok, ConnPid} = gun:open("localhost", 8080),
    {ok, _Protocol} = gun:await_up(ConnPid),

    StreamRef = gun:get(ConnPid, "/"),

    case gun:await(ConnPid, StreamRef) of
        {response, fin, _Status, _Headers} ->
            no_data;
        {response, nofin, _Status, _Headers} ->
            {ok, Body} = gun:await_body(ConnPid, StreamRef),
            io:format("~s~n", [Body])
    end.

ws() ->

    {ok, _} = application:ensure_all_started(gun),
    {ok, ConnPid} = gun:open("localhost", 8080),
    {ok, _Protocol} = gun:await_up(ConnPid),

    gun:ws_upgrade(ConnPid, "/websocket"),

    receive
        {gun_ws_upgrade, ConnPid, ok, Headers} ->
            upgrade_success(ConnPid, Headers);
        {gun_response, ConnPid, _, _, Status, Headers} ->
            exit({ws_upgrade_failed, Status, Headers});
        {gun_error, _ConnPid, _StreamRef, Reason} ->
            exit({ws_upgrade_failed, Reason})
    %% More clauses here as needed.
    after 1000 ->
        exit(timeout)
    end,

    gun:shutdown(ConnPid).


upgrade_success(ConnPid, Headers) ->
    io:format("Upgraded ~w. Success!~nHeaders:~n~w~n", 
              [ConnPid, Headers]).

Вот результат:

~/erlang_programs/my_gun$ gmake run
gmake[1]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
 GEN    rebar.config
gmake[1]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
 DEPEND my_gun.d
 ERLC   my.erl
 APP    my_gun
===> Starting relx build process ...
===> Resolving OTP Applications from directories:
          /Users/7stud/erlang_programs/my_gun/ebin
          /Users/7stud/erlang_programs/my_gun/deps
          /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang/lib
          /Users/7stud/erlang_programs/my_gun/apps
          /Users/7stud/erlang_programs/my_gun/_rel
===> Resolved my_gun_release-1
===> rendering builtin_hook_status hook to "/Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/bin/hooks/builtin/status"
===> Including Erts from /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang
===> release successfully created!
===> tarball /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/my_gun_release-1.tar.gz successfully created!
Exec: /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/erts-8.2/bin/erlexec -boot /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/my_gun_release -mode embedded -boot_var ERTS_LIB_DIR /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/lib -config /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/sys.config -args_file /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/vm.args -pa -- console
Root: /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release
/Users/7stud/erlang_programs/my_gun/_rel/my_gun_release
heart_beat_kill_pid = 32843
Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]


=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
          supervisor: {local,sasl_safe_sup}
             started: [{pid,<0.353.0>},
                       {id,alarm_handler},
                       {mfargs,{alarm_handler,start_link,[]}},
                       {restart_type,permanent},
                       {shutdown,2000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
          supervisor: {local,sasl_sup}
             started: [{pid,<0.352.0>},
                       {id,sasl_safe_sup},
                       {mfargs,
                           {supervisor,start_link,
                               [{local,sasl_safe_sup},sasl,safe]}},
                       {restart_type,permanent},
                       {shutdown,infinity},
                       {child_type,supervisor}]

=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
          supervisor: {local,sasl_sup}
             started: [{pid,<0.354.0>},
                       {id,release_handler},
                       {mfargs,{release_handler,start_link,[]}},
                       {restart_type,permanent},
                       {shutdown,2000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
         application: sasl
          started_at: '[email protected]'

=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
          supervisor: {local,runtime_tools_sup}
             started: [{pid,<0.360.0>},
                       {id,ttb_autostart},
                       {mfargs,{ttb_autostart,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,3000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:26:05 ===
         application: runtime_tools
          started_at: '[email protected]'
Eshell V8.2  (abort with ^G)

([email protected])1> my:ws().

=PROGRESS REPORT==== 10-Jul-2017::16:26:08 ===
          supervisor: {local,inet_gethost_native_sup}
             started: [{pid,<0.367.0>},{mfa,{inet_gethost_native,init,[[]]}}]

=PROGRESS REPORT==== 10-Jul-2017::16:26:08 ===
          supervisor: {local,kernel_safe_sup}
             started: [{pid,<0.366.0>},
                       {id,inet_gethost_native_sup},
                       {mfargs,{inet_gethost_native,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,1000},
                       {child_type,worker}]

=CRASH REPORT==== 10-Jul-2017::16:26:08 ===
  crasher:
    initial call: gun:proc_lib_hack/5
    pid: <0.365.0>
    registered_name: []
    exception exit: {{owner_gone,normal},
                     [{gun,loop,1,[{file,"src/gun.erl"},{line,706}]},
                      {gun,proc_lib_hack,5,[{file,"src/gun.erl"},{line,535}]},
                      {proc_lib,init_p_do_apply,3,
                                [{file,"proc_lib.erl"},{line,247}]}]}
      in function  gun:proc_lib_hack/5 (src/gun.erl, line 540)
    ancestors: [gun_sup,<0.345.0>]
    messages: []
    links: [<0.346.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 1042
  neighbours:

=SUPERVISOR REPORT==== 10-Jul-2017::16:26:08 ===
     Supervisor: {local,gun_sup}
     Context:    child_terminated
     Reason:     {{owner_gone,normal},
                  [{gun,loop,1,[{file,"src/gun.erl"},{line,706}]},
                   {gun,proc_lib_hack,5,[{file,"src/gun.erl"},{line,535}]},
                   {proc_lib,init_p_do_apply,3,
                             [{file,"proc_lib.erl"},{line,247}]}]}
     Offender:   [{pid,<0.365.0>},
                  {id,gun},
                  {mfargs,{gun,start_link,undefined}},
                  {restart_type,temporary},
                  {shutdown,5000},
                  {child_type,worker}]

** exception exit: {ws_upgrade_failed,404,
                                      [{<<"content-length">>,<<"0">>},
                                       {<<"date">>,
                                        <<"Mon, 10 Jul 2017 22:26:08 GMT">>},
                                       {<<"server">>,<<"Cowboy">>}]}
     in function  my:ws/0 (src/my.erl, line 30)

([email protected])2> 

Я сохранил все свои файлы и перезапустил Cowboy and Gun, поэтому изменения, которые я внес в код, выполняются, но я все еще получаю ошибку 404.

Я сравнил формат моих маршрутов с маршрутами в примере, на который ссылается spawn_think в комментариях, и мой формат был неправильным. Вот что у меня есть сейчас:

-module(hello_erlang_app).
-behaviour(application).

-export([start/2]).
-export([stop/1]).

start(_Type, _Args) ->
    Dispatch = cowboy_router:compile([
        {'_', [
               {"/", hello_handler, []},
               {"/websocket", myws_handler, []} 
        ]}
    ]),

    {ok, _} = cowboy:start_clear(my_http_listener,
        [{port, 8080}],
        #{env => #{dispatch => Dispatch} }
    ),

    hello_erlang_sup:start_link().

stop(_State) ->
    ok.

И после настройки одной из управляющих последовательностей в операторе io: format () в моем клиенте для оружия:

-module(my).
-compile(export_all).

get() ->
    ...

ws() ->
    ...

upgrade_success(ConnPid, Headers) ->
    io:format("Upgraded ~w. Success!~nHeaders:~n~p~n",   %% <*** CHANGED ~w to ~p 
              [ConnPid, Headers]).

вот результат:

~/erlang_programs/my_gun$ gmake run
gmake[1]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/cowlib'
gmake[2]: Entering directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
gmake[2]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/ranch'
 GEN    rebar.config
gmake[1]: Leaving directory '/Users/7stud/erlang_programs/my_gun/deps/gun'
 DEPEND my_gun.d
 ERLC   my.erl
 APP    my_gun
===> Starting relx build process ...
===> Resolving OTP Applications from directories:
          /Users/7stud/erlang_programs/my_gun/ebin
          /Users/7stud/erlang_programs/my_gun/deps
          /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang/lib
          /Users/7stud/erlang_programs/my_gun/apps
          /Users/7stud/erlang_programs/my_gun/_rel
===> Resolved my_gun_release-1
===> rendering builtin_hook_status hook to "/Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/bin/hooks/builtin/status"
===> Including Erts from /Users/7stud/.evm/erlang_versions/otp_src_19.2/lib/erlang
===> release successfully created!
===> tarball /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/my_gun_release-1.tar.gz successfully created!
Exec: /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/erts-8.2/bin/erlexec -boot /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/my_gun_release -mode embedded -boot_var ERTS_LIB_DIR /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/lib -config /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/sys.config -args_file /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release/releases/1/vm.args -pa -- console
Root: /Users/7stud/erlang_programs/my_gun/_rel/my_gun_release
/Users/7stud/erlang_programs/my_gun/_rel/my_gun_release
heart_beat_kill_pid = 34141
Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]


=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
          supervisor: {local,sasl_safe_sup}
             started: [{pid,<0.353.0>},
                       {id,alarm_handler},
                       {mfargs,{alarm_handler,start_link,[]}},
                       {restart_type,permanent},
                       {shutdown,2000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
          supervisor: {local,sasl_sup}
             started: [{pid,<0.352.0>},
                       {id,sasl_safe_sup},
                       {mfargs,
                           {supervisor,start_link,
                               [{local,sasl_safe_sup},sasl,safe]}},
                       {restart_type,permanent},
                       {shutdown,infinity},
                       {child_type,supervisor}]

=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
          supervisor: {local,sasl_sup}
             started: [{pid,<0.354.0>},
                       {id,release_handler},
                       {mfargs,{release_handler,start_link,[]}},
                       {restart_type,permanent},
                       {shutdown,2000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
         application: sasl
          started_at: '[email protected]'

=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
          supervisor: {local,runtime_tools_sup}
             started: [{pid,<0.360.0>},
                       {id,ttb_autostart},
                       {mfargs,{ttb_autostart,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,3000},
                       {child_type,worker}]

=PROGRESS REPORT==== 10-Jul-2017::16:50:53 ===
         application: runtime_tools
          started_at: '[email protected]'
Eshell V8.2  (abort with ^G)
([email protected])1> my:ws().

=PROGRESS REPORT==== 10-Jul-2017::16:50:57 ===
          supervisor: {local,inet_gethost_native_sup}
             started: [{pid,<0.367.0>},{mfa,{inet_gethost_native,init,[[]]}}]

=PROGRESS REPORT==== 10-Jul-2017::16:50:57 ===
          supervisor: {local,kernel_safe_sup}
             started: [{pid,<0.366.0>},
                       {id,inet_gethost_native_sup},
                       {mfargs,{inet_gethost_native,start_link,[]}},
                       {restart_type,temporary},
                       {shutdown,1000},
                       {child_type,worker}]
Upgraded <0.365.0>. Success!
Headers:
[{<<"connection">>,<<"Upgrade">>},
 {<<"date">>,<<"Mon, 10 Jul 2017 22:50:56 GMT">>},
 {<<"sec-websocket-accept">>,<<"S1w7rWXToZefi/NOEcDAEDb4yEU=">>},
 {<<"server">>,<<"Cowboy">>},
 {<<"upgrade">>,<<"websocket">>}]
ok
([email protected])2> 

Я достиг лимита форума на текст, поэтому посмотрите мой ответ о том, как я действительно мог отправлять и получать данные с помощью веб-сокета.