在此之前我使用 node js 并且很容易理解如何處理方法節點 js 上的示例：    switch (request.method) {    case 'OPTIONS': return OptionsResponse(response);    case 'GET': return GetSwitch(request, response);    case 'POST': return PostSwitch(request, response);    case 'PUT': return PutSwitch(request, response);    case 'DELETE': return DeleteSwitch(request, response);    default: return ErrorMessage( "Sorry, this method not supported", 501, request);}但我不知道該怎么做package utilsimport (    "log"    "net/http"    "github.com/user/go_rest_api/src/view" // page view    "github.com/user/go_rest_api/src/api" // only api server);如何在 go 中實現相同的處理程序？func HandlerRequestFunc() {http.HandleFunc("/", view.Homepage);/*get method from api server */http.HandleFunc("/api", api.InfoFromApi);/* from db api handler */http.HandleFunc("/api/login", api.Login);http.HandleFunc("/api/registration", api.Registration);/* get your list db */http.HandleFunc("/api/db/list", api.DataBaseList);/* server start function */log.Fatal(http.ListenAndServe(":3000", nil));}如何不在函數內部處理方法