Personally I would do
filter[id]=111,222,333
Though depending on the reason for your need to fetch multiple resources by ID, you may consider if the resources should be in some relationship, so that you can just fetch it like a normal relationship.
Personally I would do
filter[id]=111,222,333
Though depending on the reason for your need to fetch multiple resources by ID, you may consider if the resources should be in some relationship, so that you can just fetch it like a normal relationship.