An inherent and non-fixable GWTTestCase warning?

[Alexander Orlov]

logging for HtmlUnit thread

   [WARN] Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'http://200.200.5.141:8011/dp.verp.actas.ActAs.JUnit/dp.verp.actas.ActAs.JUnit.nocache.js', but got 'application/x-javascript'.

How can I get rid of this warning? Apparently I've to change the content type that is expected by HtmlUnit to 'application/x-javascript' or the GWTTestCase emitted content type to 'application/javascript'...

Just read a comment from somebody on this issue: "Those are warnings, you can safely ignore them" — Warnings that can be ignored? In that case what's the purpose of "warnings"?