Article middleware is used to load an Article object from the URL parameters passed through as the request.

Order middleware is used to load an Order object from the URL parameters passed through as the request.

Pagination middleware is used to extract the next page id from the url query.

SetLogger returns a middleware that logs the start and end of each request, along with some useful data about what was requested, what the response status was, and how long it took to return.

ArticleCtxKey refers to the context key that stores the article.

OrderCtxKey refers to the context key that stores the order.

PageIDKey refers to the context key that stores the next page id.