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This header was introduced to ensure that no traffic was being directed straight to the .cloudapps.digital domain. This was especially useful for the non-production environments where access to the proper domains is allowed for specific IP addresses while the cloudapps.digital ones are open. Moving to paas custom domains [1] will allow us to stop using the paas proxies and, as a result, unbind the cloudapps.digital domain from our apps. This means that the X-Custom-Forwarder will become obsolete since all our requests will be coming directly to our domain (albeit through cloudfront) so any IP restriction can be implemented with a route service [2]. 1: https://docs.cloud.service.gov.uk/deploying_services.html#set-up-a-custom-domain-using-the-cdn-route-service 2: https://docs.cloud.service.gov.uk/deploying_services.html#route-services