API
☺HTTP - Hyper Text Transfer Protocol.
Rules are transferring web pages to your browser.
☺Example for URL :
http://www.codecadamy.com
☺The web pages come from other computers on the Internet called servers.
☺REST - REpresentational State Transfer.
Set of principles.
☺API - Application Programming Interface.
☺API do,
1.Separate the client from the server.
2.Not hold state between requests.
3.Use HTTP.
☺xhr stands for XML HTTP Request.
☺Four HTTP verbs
1.GET - Information receives from the source.
2.POST - Sends new information to the specified source.
3.PUT - Updates existing information of the specified source.
4.DELETE - Removes existing information from the specified source.
☺Three parts of HTTP request.
1.Request lines - which tells the server what kind of request is being sent (GET, POST, etc.) and what resource it's looking for.
2.Header - which sends the server additional information (such as which client is making the request).
3.Body - which can be empty or contain data and information.
☺HTTP status codes
1xx: working on the request.
2xx: successfully
3xx: the server might have to reroute the request before it can get you the resource you asked for.
4xx: "file not found".(user problem)
5xx: can't successfully respond to your request.(server problem)
☺HTTP response code
1.Response line: which includes the three-digit HTTP status code.
2.Header: which includes further information about the server.
3.Body: which includes further information about the server
☺XML : Extensible Markup Language.
It is very similar to HTML.
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