Cloud Foundry more then 10 ports for an app by curl - cloud-foundry

Question

I have running app in Cloud Foundry. I would like to proceed the procedure of adding more then 10 ports to the app described here: https://docs.cloudfoundry.org/devguide/custom-ports.html#procedure
When I am trying to add more then 10 ports, I am getting an error:
cf curl /v2/apps/c5476e63-d1d2-4eb7-a757-18cff957bc5a -X PUT -d '{"ports": [2030,2031,2032,2033,2034,2035,2036,2037,2038,2039,2040,2041,2042]}'
{
"description": "The app is invalid: Process must have at most 10 exposed ports.",
"error_code": "CF-AppInvalid",
"code": 100001
}
I tried to adjust some quota definitions like total_routes (-1) or total_reserved_route_ports (-1) but without any result. Why do I get this error and how can I assign more then 10 ports by cf curl?

Answer 1

As of writing this, it would appear to be an arbitrary and hardcoded limit that cannot be changed.
See https://github.com/cloudfoundry/cloud_controller_ng/blob/master/app/models/runtime/constraints/ports_policy.rb#L9:
def validate
return if #process.ports.nil? || #process.ports.empty?
return #errors.add('Process', 'must have at most 10 exposed ports.') if ports_limit_exceeded?
return #errors.add('Ports', 'must be integers.') unless all_ports_are_integers?
...
and https://github.com/cloudfoundry/cloud_controller_ng/blob/master/app/models/runtime/constraints/ports_policy.rb#L44, which defines the limit.
def ports_limit_exceeded?
#process.ports.length > 10
end