对localhost nodejs服务器的简单ajax请求

Question

我写了非常简单的服务器:

/* Creating server */
var server = http.createServer(function (request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.end("Hello World\n");
});

/*Start listening*/
server.listen(8000);

我使用nodejs运行它.

现在我想写一个简单的客户端,使用ajax调用向服务器发送请求并打印响应(Hello World)

这里是clinet的javascript:

$.ajax({
            type: "GET",
            url: "http://127.0.0.1:8000/" ,
            success: function (data) {
            console.log(data.toString);
            }
        });

当我打开客户端html文件时,我在控制台中收到以下错误:

XMLHttpRequest cannot load http://127.0.0.1:8000/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. 

我尝试添加到以下的ajax调用:

 $.ajax({
            type: "GET",
            url: "http://127.0.0.1:8000/" ,
            dataType: 'jsonp',
            crossDomain: true,
            success: function (data) {
            console.log(data.toString);
            }
        });

但后来我明白了

Resource interpreted as Script but transferred with MIME type text/plain: "http://127.0.0.1:8000/?callback=jQuery211046317202714271843_1410340033163&_=1410340033164". 

任何人都可以解释我做错了什么,也许可以解决它？

非常感谢!

Answer 1

要克服CORS,请在node.js文件中根据需要编写以下内容:

// Website you wish to allow to connect
res.setHeader('Access-Control-Allow-Origin', '*');

// Request methods you wish to allow
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

// Request headers you wish to allow
res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

// Set to true if you need the website to include cookies in the requests sent
// to the API (e.g. in case you use sessions)
res.setHeader('Access-Control-Allow-Credentials', true);