What response code does 'on Error Continue' return if initiated by an HTTP listener?

When an HTTP listener is configured with the 'on Error Continue' error handling strategy in MuleSoft, it effectively allows the flow to continue processing even when an error occurs. In this context, the HTTP listener will return a response code indicative of a successful operation, which is represented by a 2XX response code.

The 2XX series of status codes is used to indicate that the request was successfully received, understood, and accepted. Even if there was an error in processing the request, if 'on Error Continue' is used, the flow can be designed to send back a valid success response to the client, thus corresponding to the 2XX category.

This design pattern can be particularly useful when you want to ensure that your application remains robust by handling errors gracefully while providing feedback to clients without terminating the entire flow.