6XX errors to clearly split errors due to its own execution from those returned by defined mocks.
Theses errors will only occurs on mock's endpoint started on the port
8080 by default.
It doesn't concern the Smocker's API which will always return standard HTTP errors.
The list of existing Smocker errors is:
600 - Smocker internal error
|Error returned if a problem is encountered during the processing of requests or history
601 - Error during template engine execution
|Error returned if a problem is encountered during template engine execution
602 - Error during request redirection
|Error returned if a problem is encountered during proxy mock redirection
666 - No mock found
|Error returned if no matching mock is found among those defined in Smocker for a request