I have multiple routes for the same URL with different accept types:

        Spark.get("/channel/:version/", new GetChannelFeed());
        Spark.get("/channel/:version/", "text/html", new GetChannelFeedHtml(), templateEngine);

I get the HTML version of the channel in all browsers except IE. There I get the RSS feed. The reason is that IE sends an Accept header without q factor < 1 for "/".

The full accept header for IE is "text/html, application/xhtml+xml, /". So both the text/html Route and the / Route match with the same quality.

But the standard is pretty clear that in this case the most specific media range should be preferred:

If more than one media range applies to a given type, the most specific reference has precedence.
https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

So I should get the HTML Version and not the RSS feed.