type ListUsersInput struct {
	Token    string `in:"query=access_token;header=x-access-token"`
	Page     int    `in:"query=page;default=1"`
	PerPage  int    `in:"query=per_page;default=20"`
	IsMember bool   `in:"query=is_member"`
}

func ListUsers(rw http.ResponseWriter, r *http.Request) {
	input := r.Context().Value(httpin.Input).(*ListUsersInput)

	if input.IsMember {
		// Do sth.
	}
	// Do sth.
}

type ListUsersInput struct {
	Token    string `in:"query=access_token;header=x-access-token"`
	Page     int    `in:"query=page;default=1"`
	PerPage  int    `in:"query=per_page;default=20"`
	IsMember bool   `in:"query=is_member"`
}

func SDKListUsers() {
	payload := &ListUsersInput{
		Token:    os.Getenv("MY_APP_ACCESS_TOKEN"),
		Page:     2,
		IsMember: true,
	}

	// Easy to remember, http.NewRequest -> httpin.NewRequest
	req, err := httpin.NewRequest("GET", "/users", payload)
	// ...
}

func ListUsers(rw http.ResponseWriter, r *http.Request) {
	page, err := strconv.ParseInt(r.FormValue("page"), 10, 64)
	if err != nil {
		// Invalid parameter: page.
		return
	}
	perPage, err := strconv.ParseInt(r.FormValue("per_page"), 10, 64)
	if err != nil {
		// Invalid parameter: per_page.
		return
	}
	isMember, err := strconv.ParseBool(r.FormValue("is_member"))
	if err != nil {
		// Invalid parameter: is_member.
		return
	}

	// Do sth.
}