Set the currently active context after calling Extract

[canon-cmre-craig-matear]

Hi,
I have some code based on this. In my case im using a websocket to transport the context information.

ws.MessageReceived.Subscribe(async msg => {
  var parent = Propagators.DefaultTextMapPropagator.Extract(default, msg, extractContextFromWs);
  
  // Some time later in websocket handler callstack
  _httpClient.PostAsync(someURL, someMessage);
}

I want the PostAsync http trace headers to be set from parent. I cant see how this works in the .Net SDK. The examples seem to show setting the parent trace for manual activity's.

Ideally I would like to be able to set parent as the currently active context so that all http calls automatically have the trace headers set, Is there a way to do this?

Thanks