Hessian is a protocol for services over HTTP. Unlike most other web service protocols, Hessian exchanges binary data instead of XML or JSON documents.
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Pro More efficient messages
Since information is exchanged through binary data instead of XML or JSON documents, it's much more efficient than it's counterparts and requires less bandwith.
Con Messages it sends are not readable by humans
Two nice pros of text-based exchange protocols are that the developers can read and data sent easily and they are easier to write implementations for. This is obviously lost when sending binary data directly.