对本地nodejs服务器的简单ajax请求 [英] simple ajax request to localhost nodejs server

问题描述

我写了一个非常简单的服务器:

I wrote very simple server :

/* 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.

I run it using nodejs.

现在，我想编写一个简单的客户端，该客户端使用ajax调用将请求发送到服务器并打印响应(Hello World)

Now i want to write simple client that use ajax call to send request to server and print response (Hello World)

以下是clinet的javascript:

Here javascript of clinet:

$.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，在控制台中出现以下错误:

When I open client html file i get following error in console:

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. 

我尝试将以下内容添加到ajax调用中:

I tried adding to ajax call following:

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

但是我得到

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，也许怎么解决?

Anyone can explain what i did wrong and perhaps how to fix it?

非常感谢！

推荐答案

第一个错误是由 CORS (跨来源资源共享)政策.所有浏览器都规定，除了向远程服务器允许通过Access-Control-Allow-Origin标头允许的脚本/页面外，您不能向AJAX中的远程服务器提出请求，而是向当前服务器加载脚本/页面.

The first error is caused by CORS (Cross Origin Resource Sharing) policy. It's rule by all browsers that you cannot make a request to a remote server in AJAX other than to the current server the script/page was loaded from unless that remote server allows it via Access-Control-Allow-Origin header.

我建议从同一Node.js服务器提供页面.然后它将起作用.例如，当请求到达根/页时，然后提供index.html文件，否则，服务器处理您想要的任何其他内容.

I suggest serving the page from the same Node.js server. Then it will work. Example, when the request comes to root / page, then serve the index.html file, otherwise, server whatever other content you want.

var http = require('http'),
    fs = require('fs');

/* Creating server */
var server = http.createServer(function (request, response) {
    if (request.url == '/' || request.url == '/index.html') {
        var fileStream = fs.createReadStream('./index.html');

        fileStream.pipe(response);
    } else {
        response.writeHead(200, {"Content-Type": "text/plain"});
        response.end("Hello World\n");
    }
});

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

这篇关于对本地nodejs服务器的简单ajax请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！