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the domumentation notes: When an HTTP parameter has different values for service, virtual server, and globally, the value of the most-specific entity (the service) is given the highest precedence. According to this, CS should be sufficient, but can be overridden by the individual LB or services. https://docs.citrix.com/en-us/citrix-adc/current-release/system/http-configurations.html

Ok interesting ! Thanks for your reply Martin.