Currently we throw IllegalArgumentException but that's not helpful. It looks like the behaviour in browsers varies but there's some momentum towards standardising on the first value and any subsequent ignored: https://github.com/whatwg/mimesniff/issues/41
Currently we throw IllegalArgumentException but that's not helpful. It looks like the behaviour in browsers varies but there's some momentum towards standardising on the first value and any subsequent ignored: https://github.com/whatwg/mimesniff/issues/41
See also #39.