When the request comes in, the router takes a look at the incoming connection (referred to in the future as the conn) and determines where this request needs to get routed to. It could be something that needs to be handled in a way appropriate to the browser, a way appropriate for an API to handle, or it could also just plain and simply be a 404 error that needs to get served out (depending on what the router says exists for that particular web application).
From there, the connection is passed along through the router and into a pipeline of plugs. Plugs are constructs that can be reduced down to functions that take in the connection structure and optionally some options, and then apply some form of transformation (if appropriate) and return out a modified connection structure. The beauty of this idea is in its simplicity; each plug...
