https://en.wikipedia.org/wiki/John_F._Kennedy?action=raw
http://en.wikipedia.beta.wmflabs.org/wiki/Page.title?action=raw
Seems to be a WMF server configuration issue rather than a MediaWiki issue, since links like http://www.shoutwiki.com/wiki/Alt._BGN_Series?action=raw work.