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A fundamental part of understanding restful APIs is understanding the components that make up the client-server flow of HTTP. HTTP can be described as pull protocol. Communication is always initiated by the client sending an HTTP request to the server. In turn, the server responds with a response message. These messages are just bodies of text that the machines can later interpret into actions, images, and even multimedia content. Letamp;#39;s briefly discuss some of the major components of HTTP requests and responses, starting with requests. Every HTTP message consists of a message header, and an optional message body. These two entities are separated by a space, like in the diagram here. In an HTTP request, the first line of the header is called the request line. The request line contains the HTTP verb, the URI, or Uniform Resource Identifier, and the HTTP version number. Take a look at these examples of request lines. We see the verb here, the resource we want to access via the URI
