使用nodejs搭建一个简易HTTP服务的实现示例

const http = require('http');
// 初始化http服务
const server = http.createServer();

// 启动 HTTP 服务监听连接
server.listen(8000, () => {
    console.log('service run: http://127.0.0.1:8000');
});

// 侦听请求事件
server.on('request', (req, res) => {
    try {
        // 设置响应头允许跨域
	res.setHeader('Access-Control-Allow-Origin', '*');

        res.statusCode = 200;
        res.setHeader('Content-Type', 'text/plain');
        res.end('HTTP服务搭建成功');
    } catch (ex) {
	console.error(ex.message);
	res.statusCode = 500;
	res.end('service error');
    }
});

const http = require('http');
const server = http.createServer();

server.listen(8000, () => {
    console.log('service run: http://127.0.0.1:8000');
});

server.on('request', (req, res) => {
    try {
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.setHeader('Content-Type', 'application/json');

        // 获取请求地址
	const urls = req.url.split('?');
	const requestAddress = urls[0];
       console.log(`请求地址：${ requestAddress }`);

        const callback = {
          '/test': () => {
            res.statusCode = 200;
            res.end(JSON.stringify({text: '通过测试'}));
          },
          '/': () => {
            res.statusCode = 200;
            res.end(JSON.stringify({text: 'hello world'}));
          }
        }
		
        if (callback[requestAddress] instanceof Function) {
          return callback[requestAddress]()
        }

        res.writeHead(200, '响应成功');
        res.end('成功收到请求');
    } catch (ex) {
	console.error(ex.message);
	res.statusCode = 500;
	res.end('service error');
    }
});

const http = require('http');
const server = http.createServer();

server.listen(8000, () => {
    console.log('service run: http://127.0.0.1:8000');
});

server.on('request', (req, res) => {
    try {
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.setHeader('Content-Type', 'application/json');

	const urls = req.url.split('?');
	const requestAddress = urls[0];
        console.log(`请求地址：${ requestAddress }`);

        const callback = {
          '/test': () => {
            console.log(`查询字符串：${urls[1]}`);

            if (req.method === 'POST') {
            // post请求，获取json格式的请求体参数
              let data = '';
              
              // req对象是一个流（参考Stream API），可以监听它的data事件来获取数据块。
              req.on('data', (chunk) => {
                // 这里假设收到的数据是字符串，隐式转换：二进制数据 => 字符串
                data += chunk;
              });
              
              // 在获取数据结束时，调用end事件
              req.on('end', () => {
                data = JSON.parse(data);
                console.log('请求体：', data);
              });
            }

        
            res.statusCode = 200;
            res.end(JSON.stringify({text: '通过测试'}));
          },
          '/': () => {
            console.log(`查询字符串：${urls[1]}`);
        
            res.statusCode = 200;
            res.end(JSON.stringify({text: 'hello world'}));
          }
        }
		
        if (callback[requestAddress] instanceof Function) {
          return callback[requestAddress]()
        }

        res.writeHead(200, '响应成功');
        res.end('成功收到请求');
    } catch (ex) {
	console.error(ex.message);
	res.statusCode = 500;
	res.end('service error');
    }
});

const http = require('http');
const server = http.createServer();

server.listen(8000, () => {
    console.log('service run: http://127.0.0.1:8000');
});

server.on('request', (req, res) => {
    try {
        // 跨域允许携带凭据（cookie之类）
        res.setHeader('Access-Control-Allow-Credentials', 'true');
        // 要允许跨域携带cookie，必须设置为具体的域，不能是‘*'
        res.setHeader('Access-Control-Allow-Origin', 'http://127.0.0.1:5500');
        res.setHeader('Content-Type', 'application/json');

        const requestAddress = req.url.split('?')[0];
    
        const callback = {
          '/login': () => {
            // 设置cookie
            res.setHeader('Set-Cookie', 'name=wst;age=24;Max-Age=666;');
            res.statusCode = 200;

            // 返回json格式数据到客户端
            res.end(JSON.stringify({text: '登录成功'}));
          },
          '/': () => {
            // 通过req.headers.cookie读取cookie
            console.log(req.headers.cookie)
            res.statusCode = 200;
            res.end(JSON.stringify({text: 'hello world'}));
          }
        }
		
        if (callback[requestAddress] instanceof Function) {
          return callback[requestAddress]()
        }

        res.writeHead(200, '响应成功');
        res.end('成功收到请求');
    } catch (ex) {
	console.error(ex.message);
	res.statusCode = 500;
	res.end('service error');
    }
});