my website is taking meta image tags from other website links properly but not from my own site?

This is not working with the link of image from my own website

<title><?php echo $pro_name; ?> | PhoneColony</title> 
<meta property="og:image" content="http://phonecolony.com/images/bg.jpg"/>
<meta name="description" content="<?php echo $pro_desc ?>"/>
<meta name="viewport" content="width=device-width, initial-scale=1,user-scalable=no"/>


Source: stackoverflow-php