anchor.diff:  
   #### <a id="X-Forwarded-Proto"></a> X-Forwarded-Proto
   
  -The `X-Forwarded-Proto` header gives the scheme of the HTTP request from the client. 
  +The `X-Forwarded-Proto` header gives the scheme of the HTTP request from the client.
   
   If an incoming request includes the `X-Forwarded-Proto` header, the Gorouter:
   
  
positive.code: 
  The Gorouter presents the certificate if requested by the back end during the TLS handshake.
  <% else %>
  To enable this feature, see [Configure Validation of App Instance Identity with TLS](#app-valid-tls-config). 
  <% end %>
  
  
  
negative.code: owner: Routing
  ---
  
  This topic describes how the Gorouter, the main component in the <%= vars.product_name %> routing tier, routes HTTP traffic within <%= vars.product_full %>.
  
  For more information, see the [Routing](./architecture/index.html#routing) section of the _<%= vars.product_short %> Components_ topic.
  
  