Net HTTP overview

HTTP (HyperText Transfer Protocol) : Hypertext Transfer Protocol

• Hypertext: richer than text
• Transmission: two-way communication
• agreement: an agreement between two parties

status code

• 200: OK , everything is successful
• 302: Temporary redirection, visit another URL
• 404: The URL does not exist on the server
• 502: gateway, proxy error
• 503: The current service is busy and cannot process

field

• Host: request domain name
• Content-Length: Data length
• Connection: Keep-Alive: Long connection
• Content-Type: Data Format
• Accept: supported data formats
• Content-Encoding: compression method
• Accept-Encoding: supported compression methods

Get/Post

• GET : Get the specified resource from the server
• POST : Process the specified resource according to the request body

Safe/idempotent:

• Safe: requests do not destroy service resources

• Idempotent: execute multiple times, the result is the same

• GET : Safe and idempotent, browsers, proxies, all will cache

• POST : unsafe, not idempotent, will modify service resources, multiple submissions will create multiple resources