Food pantries in Pima County Arizona and Tucson provide free or low cost groceries, food, and meals to families and individuals who need help.
One of the important aspects of REST (or at least HTTP) is the concept that some operations (verbs) are idempotent. As Gregor Roth said several years ago: The PUT method is idempotent. An idempotent method means that the result of a successful performed request is independent of the number of times it is executed. Idempotency is also something discussed in the SOA Design Patterns.
Idempotent is one of the great rubbish phrases of IT, what it means is 'idempotent in memory'. If you have a comment service with an update capability then clearly from the perspective of the invoker the service has to maintain and manage state. What you mean is can it be horizontally scaled in memory.