title: c#: How to retrieve how much time is left before a timeout for an HTTP request in WebAPI operation method?
body: <p>In a WebAPI controller method I want to calculate the time left before request timeout. But I cannot find the property to retrieve the timeout, so I could calculate.</p>
  <p>I'm using .NET 6, and my controller extends to <code>ControlerBase</code>.</p>
  <p>How to tackle that?</p>