Invalidoperationexception: an invalid request URI was provided. The request URI must either be an absolute URI or baseaddress must be set

BlazorStudents.Pages.StudentComp.OnInitializedAsync() in StudentComp.razor
-
    Student stds = new Student();
    string ids = "0";
    bool showAddrow = false;
    protected override async Task OnInitializedAsync()
    {
        student = await Http.GetJsonAsync<Student[]>("/api/Students");
    }
    void AddNewStudent()
    {
        stds = new Student();
    }

protected override async Task OnInitializedAsync()
   {
       student = await Http.GetJsonAsync<Student[]>("/api/Students");
   }