HTTP request response.

A Request line, containing three piece of information:
  the HTTP method (also called a “verb”) for sending or retrieving information
  the URI “path” of the resource where we’re sending or retrieving information  
  the version of the HTTP protocol our “client” software is using
Headers, which is a key/value pair, which contain supplimental information about our request

An optional body; we only send data to the server in the body when we are creating or modifying something

response.

a Status line, containing three pieces of information:
The version of the HTTP protocol that this response is using
a 3-digit numeric “status code”
a user-friendly string description of what the “status code” means
Headers, also sent as key/value pairs similar to the HTTP request

An optional body; almost all responses will contain additional data in the body. In mod 2, our “body” payload will almost always be HTML.