Understanding HTTP

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What is HTTP and how does it work?

This is a very basic question that every web programmer should be able to understand and explain.
HTTP short for Hyper Text Transfer Protocol is the standard way for browsers and server to communicate.
Web browsers sends a request while web servers return a response.

Commonly used HTTP request:

  • GET - request data from a specified resource or url.
  • POST - submit data from specified resource or url.
GET vs Post

GET
POST
History
Parameters remain in the Browser
Parameters not shown in the browser
Bookmark
Can Be Bookmarked
Cannot be bookmarked.
Cached
Can be Cached
Can’t Be Cached
Back/Reload Browser Button
Clicking the Back button has no effect.
Clicking the back button causes re-submitting the form.
Encoding Type
application/x-www-form-urlencoded
multipart/form-data or application/x-www-form-urlencoded Use multipart encoding for binary data.
Visibility
Query strings are visible in the url.
Its hidden.
Security
Less secure since query strings are send in plain text in the url and is saved in the browser history.
Variables are not displayed in the url.
Other HTTP Methods

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