cowboy_static no export function service_available

[weyenrooney]

when I debug cowboy I can't get correct result,I use Im() to debug it ,I found that cowboy_static no export callback function service_available.

the code line is 947 in cowboy_rest,like below:
call(Req, State=#state{handler=Handler, handler_state=HandlerState},
Callback) ->
case erlang:function_exported(Handler, Callback, 2) of
true ->
try
Handler:Callback(Req, HandlerState)
catch Class:Reason ->
error_terminate(Req, State, Class, Reason, Callback)
end;
false ->
no_call
end.
How can I resolve this?

[zhongwencool]

Maybe you should check your cowboy version:（
a lot of change after V2*

[essen]

Not sure what your problem is? Can you paste the error? cowboy_static does not have service_available because it doesn't need it.

[weyenrooney]

ok,maybe it is because of cowboy version.
The problem is that I try to debug websocket,but in chrome it return
WebSocket connection to 'ws://localhost:8080/' failed: Error during WebSocket handshake: Unexpected response code: 200
so I trace into cowboy I found that no callback function service_available and cowboy terminate immediately

[essen]

If you get a 200 response, then it's most likely you trying to connect to a handler that does not do Websocket. In your last comment you mention ws://localhost:8080/ which corresponds to / and most likely is the page serving your site rather than the Websocket handler.

If I'm incorrect please reopen. :-)