Wikimedia Bugzilla is closed!

Flow exceptions report a a specific "message from exception, used for debugging error" as well as a generic error code that is localized and shown to the user.  It seems exceptions in API calls don't return the former, making them harder to debug.

To reproduce: 

Stop the parsoid service and issue an action=flow-parsoid-utils request such as:

http://localhost/w/api.php?action=flow-parsoid-utils&format=json&from=wikitext&to=html&content=Hello&title=Main_Page

The API response is
  {"error":{
    "code":"flow-error-process-wikitext",
    "info":"An error has occurred while processing HTML/wikitext conversion."
  }}
but this error code is returned for a number of problems:

  throw new WikitextException( 'Unknown source format: ' . $from, 'process-wikitext' );
  throw new WikitextException( 'Failed contacting Parsoid', 'process-wikitext' );
  throw new WikitextException( "Unknown format requested: " . $to, 'process-wikitext' );
  throw new WikitextException( 'Parser only supports wikitext to HTML conversion', 'process-wikitext' );


It would be nice if the API response included the exception $message (instead of/as well as the English translation of the error code). It doesn't need to be localized and shouldn't be presented to the user.