As a front-end development, it is necessary to understand that browsers send HTTP requests.
7 steps of HTTP request
1. Establish TCP link
2. The browser sends a request (get / sample)/ hello.jsp HTTP/1.1）
3. Request header sent by browser
4. Server sends response (HTTP / 1.1200 OK)
5. The server sends the response header
6. The server sends data
7. The server closes the TCP connection
In the browser, what does the request information of network and the header mean
General section:
Request URL: the request URL of the resource
Request method: http method
Status code: response status code
200 (status code) ok (Reason Phrase)
301 – resources (web pages, etc.) are permanently transferred to other URLs
404 – the requested resource (web page, etc.) does not exist
500 – internal server error
Response Headers:
Content- Encoding:gzip ——Compression encoding type
Content- Type:text/html ——The type of server sending and the encoding method adopted
Date:Tue , 14 Feb 2017 03:38:28 GMT — time when the client requests the server
Last- Modified:Fri , 10 Feb 2017 09:46:23 GMT — the time when the server last modified the resource. GMT is Greenwich mean time
Server:nginx/1.2.4 ——The web server name of the server
Transfer- Encoding:chunked ——Block transfer data to client
Request Headers:
Accept:text/html ——The type of resource the client can receive
Accept- Encoding:gzip , deflate — the type of compressed data the client can receive
Accept- Language:en-US , en; q = 0.8 — the language type received by the client
Cache- Control:no-cache ——The server forbids the client to cache page data
C onnection:keep-alive ——Maintain the connection between client and server
Cookie: – the client temporarily stores the information of the server
Host:www.jnshu.com ——The target host and port number of the connection
Pragma:no-cache ——The server forbids the client to cache page data
Referer:http / / www.jnshu.com/daily/15052 ——Where did it come from
User agent: the name of the client version number
Photo taken from: https://blog.csdn.net/xiaochengyihe/article/details/80910913