Google Firebase云功能正在等待中

Question

我有服务器端代码，应该返回国家列表。当我使用'npm start'在本地进行部署时，此方法有效，但是当我使用Google Firebase部署项目时，该方法不起作用-./country仅待处理。

这是带有get函数的app.js代码。它适用于/ comments，因为它返回200响应，但/ country返回504错误。

const express = require('express');
const app = express();
const fetch = require('node-fetch');
var cors = require('cors');
var accents = require('remove-accents');
var bodyParser = require('body-parser');
var request = require('request');
app.use(bodyParser.urlencoded({extended:false}));
app.use(cors());
app.use(express.static('client'));


app.get('/country', async function (req, resp){
    try{
        let country = req.query.country_name;
        let response = await fetch('https://restcountries.eu/rest/v2/name/' + accents.remove(country));
        if(response.ok){
            let body = await response.text();
            resp.send(body);
        } else {
            if (response.code == undefined){
                let body = '';
                resp.send(body);
            }
            throw new Error('Problem getting data ' + response.code);
        }
    } catch (error) {
        console.log(error);
    }
});

app.get('/comments', async function (req, resp){
    try{
        let country = req.query.country_name;
        let response = await fetch('https://...firebaseio.com/Comments/' + country+'.json');
        if(response.ok){
            let body = await response.text();
            resp.send(body);
        } else {
            throw new Error('Problem getting data ' + response.code);
        }
    } catch (error) {
        console.log(error);
    }

});

const functions = require('firebase-functions')
exports.app = functions.https.onRequest(app);

这是firebase.json文件

{
  "hosting": {
    "public": "public",
    "rewrites": [{
      "source": "**",
      "function": "app"
      }]
  }
}