title: Adding a SocketsHttpHandler to an HttpClient created via AddHttpClient in Startup.cs?
body: <p>I'd like to add a SocketsHttpHandler to an HttpClient that I am creating via AddHttpClient in Startup.cs. The point of that is to be able to inject instrumentation etc. in the HttpClient via a factory.</p>
  
  <p>This does not give me the option to use the constructor of HttpClient, which is where you'd usually add a SocketsHttpHandler.</p>
  
  <p>Also, I don't see any obvious property etc. I can use to add it later.</p>