Hands-On RESTful Web Services with Go - Second Edition

Query-based matching

Query parameters are variables that get passed along with the URL in an HTTP request. This is what we commonly see in a REST GET request. The gorilla/mux route can match and collect query parameters. See this following URL, for example:

http://localhost:8000/articles?id=123&category=books

It has id and category as query parameters. All query parameters begin after the ? character.

Let us modify our copy of our previous example into a new one with the name queryParameters/main.go. Modify the route object to point to a new handler called QueryHandler, like this:

// Add this in your main programr := mux.NewRouter()r.HandleFunc("/articles", QueryHandler)

In QueryHandler, we can use request.URL.Query() to obtain query parameters ...