golang Unmarshall Struct In Function that do not know the type and rely on interface

here is what I need to do and can't find the resource I need in order to do it:

I need to write a generic function that will setup a handler for a MOCK server. This handler will receive a JSON object and have to unMarshall it and compare it to a reference structure and set its status accordingly depending on the correspondence between both object.
Here is the trick: we do not know inside the function what is the type of the reference.

<===== Where am I at this point ====>
I wrote this function, which doesn't work.

func createHandlerToTestDelete(route string, ref interface{}, received interface{}){
	Servmux.HandleFunc(route,
		func(w http.ResponseWriter, r *http.Request) {
			// recreate a structure from body content
			body, _ := ioutil.ReadAll(r.Body)
			json.Unmarshal(body, &received)
			
			// comparison between ref and received
			if reflect.DeepEqual(received, ref) {
				w.WriteHeader(http.StatusOK)
			} else {
				w.WriteHeader(http.StatusInternalServerError)
			}
		},
	)
}

here is how I am using it:

ref := MyStruct{...NotEmpty...}
received := MyStruct{}
createHandlerToTestDelete("aRoute", ref, received)

The result is that the server when doing Unmarshal will not care of the original type of the received variable.

Does someone has an idea?

Use reflect.New to create a pointer to a value with the same type as the reference type.

func createHandlerToTestDelete(route string, ref interface{}) {
  t := reflect.TypeOf(ref)
  ServeMux.HandleFunc(route,
	func(w http.ResponseWriter, r *http.Request) {
		v := reflect.New(t)
		if err := json.NewDecoder(r.Body).Decode(v.Interface()); err != nil {
			// handle error
		}
        // v is pointer to value. Get element for correct comparison.
		if reflect.DeepEqual(v.Elem().Interface(), ref) {
			w.WriteHeader(http.StatusOK)
		} else {
			w.WriteHeader(http.StatusInternalServerError)
		}
	},
  )
}