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HAL is an acronym for Hypertext Application Language and is designed to provide "...a set of conventions for expressing hyperlinks in either JSON or XML." HAL is a an IANA registered media type that enables RESTful APIs to return JSON (or XML) content with hypertext (aka hypermedia) that can be consumed by machine agents and easily interpreted by human agents. Because it is a registered media type, developers can specify application/hal+json as the value for the Content-Type response header.
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