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Proxies act as contracts for accessing services.
Proxy may have an expiration date, or count decremented with each usage.
Expired proxy (contract) terminates access to the underlying service.
Measuring proxy keeps usage statistics of the service and its traffic.
Remote proxy, while using the same interface, hides complex protocol details of accessing remote service from the client.
Chained proxies represent a combination of contracts, known as contract conjunction.
Proxies can be issued by the resource manager overseeing the pool of proxies with expiration parameters.
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