billibox-vue/vue.config.js

const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
  transpileDependencies: true,

  devServer: {
    proxy: {
      "/api" : {
        ws:true,
        changeOrigin: true,
        target: "http://127.0.0.1:4000/"
      }
    }
  }

})