我知道这种问题之前已经被解决过了,但我仍然不确定为什么对我的情况不起作用。
我正在本地开发一个网站,并想在各种平台和设备上测试它,所以我决定使用ngrok来实现。
我的前端运行在3000端口上,我的express服务器运行在5000端口上。
所以我打开了ngrok并输入了ngrok http 3000
在我的本地PC上,服务器运行正常,https://example.ngrok.io
没有任何问题。
但是在我的笔记本电脑(或其他设备)上,前端显示正确,但当它实际上要从后端获取数据时,会显示错误:Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:5000/weather/51.87575912475586,0.9436600208282471. (Reason: CORS request did not succeed).
在我的express服务器上,我确保使用了cors包和app.use(cors());
,我还尝试手动添加标头:
app.all('/*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});
来源:为什么在OPTIONS路由上添加CORS标头不允许浏览器访问我的API?
以下是我获取和获取数据的代码,以防我做错了:
index.js(前端)
const response = await fetch(`http://localhost:5000/weather/${lat},${lng}`); //sending request to server-side
const json = await response.json();
console.log(json); //getting the weather data from server-side
server.js(后端)
const express = require("express");
const mongoose = require("mongoose");
const fetch = require("node-fetch");
const cors = require('cors');
const nodemailer = require('nodemailer');
require('dotenv').config();
const users = require('./routes/api/users');
const app = express();
//Json Middleware
app.use(express.json());
app.use(cors());
//Getting URI from keys file
const db = require('./config/keys').mongoURI;
//Connect to the Database
mongoose.set('useUnifiedTopology', true);
mongoose.set('useCreateIndex', true);
mongoose.connect(db, {useNewUrlParser: true})
.then(()=> console.log("Database Connected"))
.catch(err=> console.log(err));
//Route for user routes
app.use('/api/users',users);
const dbport = process.env.PORT || 5000;
app.listen(dbport, () => console.log(`Server started on port ${dbport}`));
app.get('/weather/:latlon', async (req,res) =>{ //awating request from client-side
const latlon = req.params.latlon.split(',');
console.log(req.params);
const lat = latlon[0];
const lon = latlon[1];
console.log(lat,lon);
const api_key = process.env.API_KEY;
const weather_url = `https://api.darksky.net/forecast/${api_key}/${lat},${lon}?units=auto`; //getting data from weather API
const fetch_res = await fetch(weather_url);
const json = await fetch_res.json();
res.json(json); //sending weather data back to client-side
});
由于本地主机的性质,这是否可行?
火狐和谷歌浏览器都存在同样的问题。
感谢您的帮助!