HTTP is defined through a series of Request for Comments (RFC) documents. We won't review all of the particulars, but we will touch on the three main points.
The HTTP protocol includes requests and replies. A request includes a method, a Uniform Resource Identifier (URI), some headers, and optional attachments. A number of available methods are defined in the standards. Most browsers focus on making GET and POST requests. The standard browsers include the GET, POST, PUT, and DELETE requests, which are the ones that we'll leverage, because they correspond to CRUD operations. We'll ignore most of the headers and focus on the path portion of the URI.
An HTTP reply includes a status code number and reason text, as well as any headers and attached data. There are a variety of status code numbers. The response codes are generally...