cds-ui/designer-client/proxy.conf.json

{
  "/controllerblueprint/*": {
    "target": "https://localhost:3000",
    "secure": false,
    "logLevel": "debug",
    "changeOrigin": true
  },
  "/resourcedictionary/*": {
    "target": "https://localhost:3000",
    "secure": false,
    "logLevel": "debug",
    "changeOrigin": true
  }
}