proxy.conf.json

{
  "/data": {
    "target": "http://localhost:4000",
    "pathRewrite": {
      "^/data": ""
    },
    "logLevel": "debug",
    "secure": false
  },
  "/wss/subscriptions": {
    "target": "ws://localhost:4000",
    "pathRewrite": {
      "^/wss": ""
    },
    "logLevel": "debug",
    "secure": false,
    "ws": true
  }
}