The following HTTP methods are the most used ones :
GET : A specified resource's representation is requested by the GET method. These requests can only retrieve data.
POST : Posting of the data enclosed in the request as a new entity is done using the POST method. The entity is identified by the URI.
PUT : Modification in the existing entity is done with the data enclosed in the request identified by the URI.
DELETE : The request for deleting the specified source is made by the DELETE method.
