Get 301 status code when sending GET request with parameter

I have a very simple Go server code setup with mux and when I use curl with GET request params (localhost:8080/suggestions/?locale=en), I get 301 status code (Move permanently). But when there's no get parameters, it's working just fine.

func main() {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/suggestions", handleSuggestions).Methods("GET")
log.Fatal(http.ListenAndServe("localhost:8080", router))
}

Can somebody shed me a light on this.Thanks

go doc mux.StrictSlash states:

func (r *Router) StrictSlash(value bool) *Router
    StrictSlash defines the trailing slash behavior for new routes. The initial
    value is false.
    When true, if the route path is "/path/", accessing "/path" will redirect to
    the former and vice versa. In other words, your application will always see
    the path as specified in the route.
    When false, if the route path is "/path", accessing "/path/" will not match
    this route and vice versa.
    Special case: when a route sets a path prefix using the PathPrefix() method,
    strict slash is ignored for that route because the redirect behavior can't
    be determined from a prefix alone. However, any subrouters created from that
    route inherit the original StrictSlash setting.

So to avoid the redirects you can either mux.NewRouter().StrictSlash(false) which is equivalent to mux.NewRouter() or use a URL with a trailing slash i.e. router.HandleFunc("/suggestions/", handleSuggestions).Methods("GET")

That's simply because you registered the path /suggestions (note: there is no trailing slash), and you call the URL localhost:8080/suggestions/?locale=en (there is a trailing slash after /suggestions).

You router detects that there's a registered path which would match the requested path without the trailing slash (based on your Router.StrictSlash() policy), so it sends a redirect which when followed would lead you to a valid, registered path.

Simply use a URL without trailing slash after suggestions:

localhost:8080/suggestions?locale=en