HTTP methods are used to retrieve data from an URL :
GET : The GET is the method that sends data to the server unencrypted.
HEAD : HEAD is similar to GET, but that it has no response body.
POST : The POST server does not cache the HTML form data that it sends
PUT : It is the method in which the uploaded content replaces current data representations of the target resources.
DELETE : This method removes the current representations of the target resource that is suggested by a URL.
