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The service provides persistent URLs for science applications to maintain access to them as their hosting environments change over time. Based on a finding that URLs change for almost half of all scientific web services within 5 years, the service defines an access URL that forwards to a current access address. Forwarding information can be updated if access information changes, so the service's URL continues redirecting to the updated location. API methods support submission of an encoded URL and return a shortened URL at the service's domain. Submissions can also specify a desired URL tag, and the API will return either the shortened URL using that tag or an error message if it is already in use.