private static String withoutPort(String hostHeader) {
        return hostHeader.replaceFirst("(:[\\d]+)?$", "");
    }
This handler implements the /akamai health check.

The global routing service polls /akamai to determine if a deployment should receive requests via its global
endpoint.

@author oyving
@author Martin Polden
@author Torbjorn Smorgrav
@author Wacek Kusnierczyk
routing-generator/src/main/java/com/yahoo/vespa/hosted/routing/restapi/AkamaiHandler.java