title: Using legacy projects containing 'System.Web.HttpContext' in ASP.NET Core3.1
body: <p>We have some legacy projects, written with .Net Framework which should be used by an API project which is written by ASP.NET Core3.1.
  The problem is that these legacy projects are using 'System.Web.HttpContext' that you know does not exist in .net core anymore. 
  Now we are receiving this error:
  '<strong>Could not load type 'System.Web.HttpContext' from assembly 'System.Web</strong>, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.'<br>
  Have you faced this problem before? Can anyone help please?</p>