4.8.1 Client Request

 POST https://sts1.contoso.com/adfs/proxy/webapplicationproxy/trust?api-version=1 HTTP/1.1
 Content-Type: application/json;charset=UTF-8
 Host: sts1.contoso.com
 Content-Length: 35
 Expect: 100-continue
  
 {"Identifier":"https:\/\/appProxy"}