fix

app/routers/finish.go

@@ -10,20 +10,18 @@ type FinishRequestBody struct {
 	Id string `json:"id"`
 }
 
-func Finish(w http.ResponseWriter, r *http.Request) {
+func Finish(r *http.Request) (interface{}, int) {
 	d := json.NewDecoder(r.Body)
 	body := FinishRequestBody{}
 	err := d.Decode(&body)
 	if err != nil {
-		w.WriteHeader(http.StatusBadRequest)
-		return
+		return nil, http.StatusBadRequest
 	}
 
 	err = tasks.Finish(body.Id)
 	if err != nil {
-		w.WriteHeader(http.StatusInternalServerError)
-		return
+		return nil, http.StatusInternalServerError
 	}
 
-	w.WriteHeader(http.StatusAccepted)
+	return nil, http.StatusAccepted
 }