| http://www.w3.org/ns/prov#value | - For example, you might have a controller that is acting as a simple proxy to a third party service such as Twitter or Facebook, and you need any of the HTTP errors encountered when calling those sites to be handled natively by your app. Another use case would be in a Service-oriented architecture (SOA), where you want any errors in your back end services propagated to your front end web applicatio
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