Added contentLength for ranges and inline content

I added Content-Length and Last-Modified headers - however I'm still confused as my problem persists. Yes we're fixing a bug here, but still I see an error here:

You can open this in your browser:
http://kechef.com/cfs/files/chefphotos/4w3ArgFDqmMDzi5aD/uvc%207.jpg?store=chefphotos_horizontal

However, if you try to debug this URL with facebook's debugger, it times out. Which is still the same issue I have when I wget it. https://developers.facebook.com/tools/debug/og/object/