https://bugzilla.wikimedia.org/show_bug.cgi?id=67000

            Bug ID: 67000
           Summary: Flow: failed API call doesn't provide exception
                    message
           Product: MediaWiki extensions
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: Unprioritized
         Component: Flow
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected]
       Web browser: ---
   Mobile Platform: ---

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.

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