cn+dt

1.0 Non persistent connection

The transmission of each web page element object needs to establish a separate tcp Connect . in other words , The time required to request a World Wide Web document is the transmission time of the document plus two rtt Round trip time , One for the tcp Connect , Another time for requesting and receiving documents .

http Several methods commonly used in request message ：

get： Request read by url The message marked

post; Add information to the server

head： Read url The first

connect： For proxy servers

html Hypertext markup language

http and https difference

1. Different security ：HTTP Plaintext transmission , Data is unencrypted , Poor safety ,HTTPS（SSL+HTTP） The data transmission process is encrypted , Good security .
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