Github pages, HTTP headers

I serve some of my files from my Github pages account. But when I check my "js" files' headers, I saw following:

Last-Modified:Sun, 10 Feb 2013 14:00:46 GMT 
Expires:Sun, 10 Feb 2013 14:13:23 GMT
Cache-Control:max-age=600

This file was commited 14 days ago. But I don't plan these files so frequent. So I need to make much bigger max-age value and change Last-Modified value to last commited date.

Is it possible to change headers of Github pages?

I asked this to Github admins, and they told me that "it is not possible" to change headers. They added this issue to wishlist.

The answer is no, however we can stimulate html header on html pages using <meta http-equiv> tag.

<meta http-equiv="last-modified" content="Sun, 10 Feb 2013 14:00:46 GMT " />
<meta http-equiv="cache-control" content="Private" />
<meta http-equiv="Expires" content="600" />

You can embed these snippets into the HTML page.