title: Url.Content not working when using under .net core 3.1 &
body: <p>I am trying to follow below article for SAML implementation &amp; i am very new to the .net core and SAML
  <a href="https://developer.okta.com/blog/2020/10/23/how-to-authenticate-with-saml-in-aspnet-core-and-csharp" rel="nofollow noreferrer">https://developer.okta.com/blog/2020/10/23/how-to-authenticate-with-saml-in-aspnet-core-and-csharp</a></p>
  <p>When added code into AuthController.cs , i am getting error for Login method. In below code Url.Content giving error 'The name url does not exist in current context'. Also package 'using Okta_SAML_Example.Identity;' is giving error regarding assembly as its not there.</p>
  <p>var binding = new Saml2RedirectBinding();
  binding.SetRelayStateQuery(new Dictionary&lt;string, string&gt; { { relayStateReturnUrl, returnUrl ?? Url.Content(&quot;~/&quot;) } });</p>
  <p>Want to set the context : my idp will be internal organization idp [it will be configured by different team in org and for now they want me to provide attributes which i want in response] so where exactly in code it will be referred as i dont see IDP reference url in the code &amp; xml sample too. please help me as need guidance at earlist.</p>