feed dialog: picture not showing up

Question

My Facebook feed dialog link correctly renders a dialog page, but the image set with the picture parameter does not show up -- just the gray line that indicates no picture.

I've changed picture files and types a few times, but the image still doesn't show up.

Here is the code:

$share_url = "https://www.facebook.com/dialog/feed?app_id=$app_id";
$share_url .= "&link=http://www.doozeez.com";
$share_url .= "&picture=http://doozeez.com/images/halloweenloot.png";
$share_url .= "&caption=to spend in the biggest rewards program in the www (whole wide world)";
$share_url .= "&name=doozeez ... get zeez for what you dooz";
$share_url .= "&description=grab your invitation to join me at the front of the line for doozeez launch";
$share_url .= "&redirect_uri=http://www.doozeez.com/";
echo("<script> top.location.href='" . $share_url . "'</script>");

I've done it with and without a urlencode() for the picture url, and that doesn't make a difference. I've also run it through the Facebook debugger linter.

Is there something we need to change in our php.ini file? Our image files seem to be unavailable to the Facebook platform. Yet, they display on the public web just fine.

Here is the rendered url: https://www.facebook.com/dialog/feed?app_id=192590464145496&link=http://www.doozeez.com/&picture=http://doozeez.com/images/halloweenloot.png&caption=to%20spend%20in%20the%20biggest%20rewards%20program%20in%20the%20www%20(whole%20wide%20world)&name=doozeez%20...%20get%20zeez%20for%20what%20you%20dooz&description=grab%20your%20invitation%20to%20join%20me%20at%20the%20front%20of%20the%20line%20for%20doozeez%20launch&redirect_uri=http://www.doozeez.com/

Answer 1

In case anyone else encounters this issue, make note that Facebook requires your image to an have extension (even if you already use the proper headers). This is true even if your image works in the lint tool without an extension like .png or .jpg.