func URLFormat(next http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()

		var format string
		path := r.URL.Path

		if strings.Index(path, ".") > 0 {
			base := strings.LastIndex(path, "/")
			idx := strings.Index(path[base:], ".")

			if idx > 0 {
				idx += base
				format = path[idx+1:]

				rctx := chi.RouteContext(r.Context())
				rctx.RoutePath = path[:idx]
			}
		}

		r = r.WithContext(context.WithValue(ctx, URLFormatCtxKey, format))

		next.ServeHTTP(w, r)
	}
	return http.HandlerFunc(fn)
}
func URLFormat(next http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()

		var format string
		path := r.URL.Path

		if strings.Index(path, ".") > 0 {
			base := strings.LastIndex(path, "/")
			idx := strings.Index(path[base:], ".")

			if idx > 0 {
				idx += base
				format = path[idx+1:]

				rctx := chi.RouteContext(r.Context())
				rctx.RoutePath = path[:idx]
			}
		}

		r = r.WithContext(context.WithValue(ctx, URLFormatCtxKey, format))

		next.ServeHTTP(w, r)
	}
	return http.HandlerFunc(fn)
}
func URLFormat ( next http . Handler ) http . Handler { fn := func ( w http . ResponseWriter , r * http . Request ) { ctx := r . Context ( ) var format string path := r . URL . Path if strings . Index ( path , " " ) > 0 { base := strings . LastIndex ( path , " " ) idx := strings . Index ( path [ base : ] , " " ) if idx > 0 { idx += base format = path [ idx + 1 : ] rctx := chi . RouteContext ( r . Context ( ) ) rctx . RoutePath = path [ : idx ] } } r = r . WithContext ( context . WithValue ( ctx , URLFormatCtxKey , format ) ) next . ServeHTTP ( w , r ) } return http . HandlerFunc ( fn ) }
// URLFormat is a middleware that parses the url extension from a request path and stores it
// on the context as a string under the key `middleware.URLFormatCtxKey`. The middleware will
// trim the suffix from the routing path and continue routing.
//
// Routers should not include a url parameter for the suffix when using this middleware.
//
// Sample usage.. for url paths: `/articles/1`, `/articles/1.json` and `/articles/1.xml`
//
//  func routes() http.Handler {
//    r := chi.NewRouter()
//    r.Use(middleware.URLFormat)
//
//    r.Get("/articles/{id}", ListArticles)
//
//    return r
//  }
//
//  func ListArticles(w http.ResponseWriter, r *http.Request) {
// 	  urlFormat, _ := r.Context().Value(middleware.URLFormatCtxKey).(string)
//
// 	  switch urlFormat {
// 	  case "json":
// 	  	render.JSON(w, r, articles)
// 	  case "xml:"
// 	  	render.XML(w, r, articles)
// 	  default:
// 	  	render.JSON(w, r, articles)
// 	  }
// }
//
URLFormat is a middleware that parses the url extension from a request path and stores it on the context as a string under the key middleware . URLFormatCtxKey . The middleware will trim the suffix from the routing path and continue routing . Routers should not include a url parameter for the suffix when using this middleware . Sample usage .. for url paths : / articles / 1 / articles / 1 . json and / articles / 1 . xml func routes () http . Handler { r : = chi . NewRouter () r . Use ( middleware . URLFormat ) r . Get ( / articles / { id } ListArticles ) return r } func ListArticles ( w http . ResponseWriter r * http . Request ) { urlFormat _ : = r . Context () . Value ( middleware . URLFormatCtxKey ) . ( string ) switch urlFormat { case json : render . JSON ( w r articles ) case xml : render . XML ( w r articles ) default : render . JSON ( w r articles ) } }