c# Initialize httpClient to Application Restart Level -- 2

while (true)
{
using (var _httpClient = new HttpClient())
{
}
}

I'm currently using it in the same form as above.

However, this initializes the httpclient on demand, but it is not a complete initialization on every request.

For example, it is different from shutting down and restarting an application.
So I want to reset the application restart level

* i dont need restart app *