core components of api

11-An action showing HTTP methods like
2GET, PUT, POST, DELETE.
32-Uniform Resource Identifier (URI),
4 which is the identifier for the resource on the server.
53-HTTP Version, which indicates HTTP
6version, for example-HTTP v1.1.
74-Request Header, which carries metadata
8(as key-value pairs) for the HTTP Request message.
9Metadata could be a client (or browser) type,
10  format supported by the client, format 
11of a message body format,
12  cache settings, and so on.
135-Request Body, which indicates the
14message content or resource representation.
15