带Cordova的Websocket在iPad上不起作用

Question

I'm trying to implement WebSockets in JS with Cordova. I don't use any plugins, I do this with the native WebSockets of JS. Basically, my apps connect to the back end, send a message and then wait for the response. This works fine on Chrome / Firefox but when I install it on my iPad the front-end WebSockets never connects to the back-end.

So i tried to add some content policy in my meta tag:

<meta http-equiv="Content-Security-Policy" content="default-src * gap: file: ws: wss: ; style-src 'self' 'unsafe-inline'; img-src 'self' data: ; script-src * 'unsafe-inline' 'unsafe-eval'; connect-src 'self' ws: ;">

the websocket is created and used like this:

ws = new WebSocket('ws://backEndIP:port/')
ws.send('/skeleton/last')
  ws.onmessage = function (event) {
    resolve(event.data);
  }

I don't know what i can be missing.

EDIT

I added <access origin='*' allows-arbitrary-loads-for-media='true' allows-arbitrary-loads-in-web-content='true' allows-local-networking='true' /> in config.xml but it still doesn't work.

Answer 1

I think you have to add backEndIP to your cordova whitelist in config.xml.

See documentation here : https://cordova.apache.org/docs/en/latest/guide/appdev/whitelist/