Content negotiation is a mechanism defined in the HTTP specification that makes it possible to serve different versions of a document (or more generally, a resource representation) at the same URI, so that user agents can specify which version fit their capabilities the best.

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If you want to build a true REST API, you should seriously consider using Content Negotiation for versioning. In this way, you prevent link bloat, and effectively decouple versioning from the identity of each resource.