This package provides an HttpClientHandler that automatically upgrades HTTP requests to HTTPS when the server supports HSTS. It comes with a list of preloaded HSTS hosts.
var policies = new HstsDomainPolicyCollection(includePreloadDomains: true);
using var client = new HttpClient(new HstsClientHandler(new SocketsHttpHandler(), policies), disposeHandler: true);
// Automatically upgrade to HTTPS as google.com is in the HSTS preload list
using var response = await client.GetAsync("http://google.com");