創(chuàng)建于2016 應(yīng)該是當(dāng)時看到別人的文章之后的筆記,如果作者看到請聯(lián)系我
http事務(wù)解剖
創(chuàng)建服務(wù)
var http = require('http');
var server = http.createServer(function(request, response) {// magic happens here!});
還可以有另一種寫法
var server = http.createServer();
server.on('request', function(request, response) {// the same kind of magic happens here!});
在一般的案例中诗祸，我們通過端口號監(jiān)聽服務(wù)
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和端口的全鏈接
var headers = request.headers;var userAgent = headers['user-agent'];
headers 獲取瀏覽器傳遞過來的所有header內(nèi)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});
處理錯誤請求
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.
現(xiàn)在我們還缺少對瀏覽器的反饋
http status code
response.statusCode = 404; // Tell the client that the resource wasn't found.
404錯誤 找不到頁面浇冰，其他code也這么使用
設(shè)置回應(yīng)的標(biāo)題頭
response.setHeader('Content-Type', 'application/json');
response.setHeader('X-Powered-By', 'bacon');
顯示的發(fā)送頭數(shù)據(jù)
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();
也可以這么發(fā)送
response.end('<html><body><h1>Hello, World!</h1></body></html>');
另一種錯誤處理的便捷方式
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);
簡單的回應(yīng)服務(wù)
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);
現(xiàn)在假設(shè)一個情況:
- get請求
- /echo 連接
- 其他情況都返回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);
不要忘記贬媒，request是readStream response是writeStream,我們可以使用pipe簡化上面的代碼
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);
增加處理錯誤請求的方法
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);
