When parameters for the action are incorrectly entered, the format argument is ignored and the result is format=xmlfm. This can potentially break many clients.

Example: http://en.wikipedia.org/w/api.php?format=xml&action=

should produce xml, not xmlfm format.

Version: unspecified
Severity: minor
URL: http://en.wikipedia.org/w/api.php?format=xml&action=