javascript - 发送ajax请求到远程node.js服务器

Question

我有简单的 Nodejs 服务器(包括 CORS):

var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var port = 8001;
http.listen(port,function () {
    console.log('listening on:'+ port);
});
app.use(function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8000');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
    res.setHeader('Access-Control-Allow-Credentials', true);
    next();
});
app.post('/getSockets', function (req,res,next) {
   console.log(req.body);
});

和简单的ajax请求

 $.ajax({
                type: "POST",
                url: "http://localhost:8001/getSockets",
                data: "Hello world",
                success: function (data, textStatus, XMLHttpRequest) {
                    console.log(data);
                    console.log("success!");
                },
                error: function(XMLHttpRequest, textStatus, errorThrown) {
                    console.log(XMLHttpRequest.status);
                }
            });

但是我遇到了错误 404，找不到 localhost:8001/getSockets

Answer 1

404错误意味着该URL不存在或无法访问

更改此行:

res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8000');

对此:

res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8001');