First, enter the URL after the press Enter, this time the DNS server to resolve the current URL by URL ip;
To really look at IPthe future, this time the browser will webinitiate a server tcpconnection request ( three-way handshake ):
First : the establishment of a link, the client sends a synpacket to the server, and enters SYN_SENT(transmission control protocol) state, waiting for the server to confirm;
Second : the server receives a synpacket, must confirm the customer syn, while themselves transmit a ackpacket, i.e. syn + ackthe package, this time into the server SYN_RECV(after passive open end of the service, the client receives synand transmits the ackstate) state;
Third : the client receives a server syn + ackpacket, send a confirmation packet to the server ack, this package has been sent, the client and server into the ESTABLISHED( tcpsuccessful connection) state, complete the three-way handshake;
After the end of the three-way handshake, the client and server to establish a good connection, this time the tcpagreement is disconnected;
Began a visit to the default under the current server index.html, and call the access resource file, display the corresponding content