The use of X-<Name> prefixed header names is now depreciated RFC 6648. You can read more about that here:
<a href="http://tools.ietf.org/html/rfc6648" rel="nofollow">http://tools.ietf.org/html/rfc6648</a>
<a href="http://tools.ietf.org/html/draft-ietf-appsawg-xdash-05" rel="nofollow">http://tools.ietf.org/html/draft-ietf-appsawg-xdash-05</a><p>Discussion into this is on SO:
<a href="http://stackoverflow.com/questions/3561381/custom-http-headers-naming-conventions" rel="nofollow">http://stackoverflow.com/questions/3561381/custom-http-heade...</a>
Side note regarding the page as a whole: the link on the main page in the footer is broken ("older posts"). It points to [1] and displays a CSS file instead of the page because of the query string.<p>[1] <a href="http://apiux.com/page/2/?custom-css=1&csblog=1&cscache=6&csrev=24" rel="nofollow">http://apiux.com/page/2/?custom-css=1&csblog=1&cscac...</a>