创建于2016 应该是当时看到别人的文章之后的笔记,如果作者看到请联系我
http事务解剖
创建服务
var http = require('http');
var server = http.createServer(function(request, response) {// magic happens here!});
还可以有另一种写法
var server = http.createServer();
server.on('request', function(request, response) {// the same kind of magic happens here!});
在一般的案例中，我们通过端口号监听服务
Method，url和Headers
var method = request.method;var url = request.url;
method 是http的提交方式,url是除去ip和端口的全链接
var headers = request.headers;var userAgent = headers['user-agent'];
headers 获取浏览器传递过来的所有header内容
RequestBody
var body = [];
request.on('data', function(chunk) {
body.push(chunk);}).on('end', function() {
body = Buffer.concat(body).toString();// at this point, `body` has the entire request body stored in it as a string});
处理错误请求
request.on('error', function(err) {// This prints the error message and stack trace to `stderr`.
console.error(err.stack);});
整合上述
var http = require('http');
http.createServer(function(request, response) {var headers = request.headers;var method = request.method;var url = request.url;var body = [];
request.on('error', function(err) {
console.error(err);}).on('data', function(chunk) {
body.push(chunk);}).on('end', function() {
body = Buffer.concat(body).toString();// At this point, we have the headers, method, url and body, and can now// do whatever we need to in order to respond to this request.});}).listen(8080); // Activates this server, listening on port 8080.
现在我们还缺少对浏览器的反馈
http status code
response.statusCode = 404; // Tell the client that the resource wasn't found.
404错误 找不到页面，其他code也这么使用
设置回应的标题头
response.setHeader('Content-Type', 'application/json');
response.setHeader('X-Powered-By', 'bacon');
显示的发送头数据
response.writeHead(200, {'Content-Type': 'application/json','X-Powered-By': 'bacon'});
response body
response.write('<html>');
response.write('<body>');
response.write('<h1>Hello, World!</h1>');
response.write('</body>');
response.write('</html>');
response.end();
也可以这么发送
response.end('<html><body><h1>Hello, World!</h1></body></html>');
另一种错误处理的便捷方式
response.on('error',function(err){//...})
整合在一起
ar http = require('http');
http.createServer(function(request, response) {var headers = request.headers;var method = request.method;var url = request.url;var body = [];
request.on('error', function(err) {
console.error(err);}).on('data', function(chunk) {
body.push(chunk);}).on('end', function() {
body = Buffer.concat(body).toString();// BEGINNING OF NEW STUFF
response.on('error', function(err) {
console.error(err);});
response.statusCode = 200;
response.setHeader('Content-Type', 'application/json');// Note: the 2 lines above could be replaced with this next one:// response.writeHead(200, {'Content-Type': 'application/json'})var responseBody = {
headers: headers,
method: method,
url: url,
body: body
};
response.write(JSON.stringify(responseBody));
response.end();// Note: the 2 lines above could be replaced with this next one:// response.end(JSON.stringify(responseBody))// END OF NEW STUFF});}).listen(8080);
简单的回应服务
var http = require('http');
http.createServer(function(request, response) {var body = [];
request.on('data', function(chunk) {
body.push(chunk);}).on('end', function() {
body = Buffer.concat(body).toString();
response.end(body);});}).listen(8080);
现在假设一个情况:
- get请求
- /echo 连接
- 其他情况都返回404
var http = require('http');
http.createServer(function(request, response) {if (request.method === 'GET' && request.url === '/echo') {var body = [];
request.on('data', function(chunk) {
body.push(chunk);}).on('end', function() {
body = Buffer.concat(body).toString();
response.end(body);})} else {
response.statusCode = 404;
response.end();}}).listen(8080);
不要忘记，request是readStream response是writeStream,我们可以使用pipe简化上面的代码
var http = require('http');
http.createServer(function(request, response) {if (request.method === 'GET' && request.url === '/echo') {
request.pipe(response);} else {
response.statusCode = 404;
response.end();}}).listen(8080);
增加处理错误请求的方法
var http = require('http');
http.createServer(function(request, response) {
request.on('error', function(err) {
console.error(err);
response.statusCode = 400;
response.end();});
response.on('error', function(err) {
console.error(err);});if (request.method === 'GET' && request.url === '/echo') {
request.pipe(response);} else {
response.statusCode = 404;
response.end();}}).listen(8080);
