Network has become everyone's life embellishment unconsciously. In the online world, people can shop, query information, query data. Stay at home, thousands of miles glance tone.
Today I will give you popularize, we open the search engine (Baidu), typing in the text box and click the Search, this process has gone through in the end what ~ ~ ~ do not know the content for all readers, after reading I believe we must understand. (Emmm, readers do not understand computers read this article ticket items should still be a little dizzy right ......)
If you want to learn more programming and Internet articles, you can see the very bottom of the article Oh! ! ! I will tell you in detail the way. Then begin to explain ~ ~ ~
1, the user enters the website domain name in the browser address bar
2, the browser automatically to get the domain address of the DNS request to the DNS server ip corresponding to the input user query
3, after the browser to get the ip address, the ip address + port number (HTTP default 80) and server to establish a connection (via three-way handshake)
4, three-way handshake after the connection is successfully established
5, the browser url address of the user input through the HTTP protocol request packet packaged and sent to the server via Socket (ip server address and port number)
6, when the server receives the HTTP client browser request message sent from the time, according to the HTTP protocol request packet parsed
7, then get the server request information (e.g., request path url) request packet, and accordingly the service logic operation
8, when the service logic processing is completed, the data server to be sent to the client in accordance with HTTP protocol response message packaging
9, then the server through the Socket (ip client address + port number) the response packet data is sent to the client browser
10, the time when the browser receives the response server sends its own data packets, according to the HTTP protocol browser content packets parsed
11, the browser to get the response data packet begins parsing rendering html, css, JavaScript execution
12, if the parsing process (top to bottom), the label found in the outer chain (link, css, img)
13, the browser will automatically initiate a new request (or by Socket) points to the path of address labels.
___ ___ completed to explain it over here, it is not it suddenly felt understood why. If you like you can continue to read down a few.
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