The echo option has the following limitations:

• Echoing a service is supported only with Mediator interfaces having the following types of WSDL files:

  • Request/reply

  • Request/reply/fault

  • Request/callback

  Note:

  The echo option is not available for Mediator interfaces having request/reply/fault/callback WSDL files or for one-way WSDL files.

• The echo option is available for synchronous operations such as request/reply and request/reply/fault.

  Note:

  The echo option is only available for synchronous operations when the routing rule is sequential because parallel routing rules are not supported for Mediators with synchronous operations.

• For synchronous operations with a conditional filter, the echo option does not return a response to the caller when the filter condition is set to false. Instead, it returns a null response.

• The echo option is available for asynchronous operations only if the Mediator interface has a callback operation. In this case, the echo is run on a separate thread.

  Note:

  The asynchronous echo option is available only when the routing rule is parallel. If you use the echo option, then sequential routing rules are not supported for Mediators with asynchronous operations.