Merge pull request #1030 from nathan-swannet/dev

fix(auth): fix an issue where an asp.net application could potentially freeze when targetting a SharePoint On-premise environment

Author: gautamdsheth

src/lib/PnP.Framework/AuthenticationManager.cs

@@ -1478,7 +1478,7 @@ internal void ConfigureOnPremisesContext(string siteUrl, ClientContext clientCon
                 //       PowerShell do support SharePoint on-premises.
                 webRequestEventArgs.WebRequestExecutor.WebRequest.Credentials = (sender as ClientContext).Credentials;
                 // CSOM for .NET Standard does not handle request digest management, a POST to client.svc requires a digest, so ensuring that
-                webRequestEventArgs.WebRequestExecutor.RequestHeaders["X-RequestDigest"] = (sender as ClientContext).GetOnPremisesRequestDigestAsync().GetAwaiter().GetResult();
+                webRequestEventArgs.WebRequestExecutor.RequestHeaders["X-RequestDigest"] = Task.Run(async () => await (sender as ClientContext).GetOnPremisesRequestDigestAsync()).GetAwaiter().GetResult();
                 // Add Request Header to force Windows Authentication which avoids an issue if multiple authentication providers are enabled on a webapplication
                 webRequestEventArgs.WebRequestExecutor.RequestHeaders["X-FORMS_BASED_AUTH_ACCEPTED"] = "f";
             };