In TIBCO eFTL™ Software Release 6.5.0 Release Notes => New Features, it states:

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Request/Reply REST API Support

Between eFTL clients, and between eFTL and FTL clients, you can now post a request message and receive a response in the form of a reply message.
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It is revised as the following:

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Request/Reply API Support

Between eFTL clients, between eFTL and FTL clients, and between eFTL and EMS clients,  you can now send a request message and
receive a response in the form of a reply message.

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