The REST Echo test case tests the HTTP transport layer as well as other basic functionality associated with REST APIs such as the JSON parser and the REST router. The ESQL compute node appearing in the implementation of the only REST operation of the API performs a message copy from the request to the response. Furthermore, in order to force a full message parse without having to change the default parse timing setting on the HTTP Input node embedded in the REST API implementation, it modifies the last element of the request message.

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