src/install/mod_pagespeed_example/extend_cache.html - incubator-pagespeed-mod - Git at Google

 <html>
   <body>
     <p>mod_pagespeed will rewrite this image's source to include a content-hash.
     Note that this requires a background asynchronous fetch of the image;
     therefore the page may not be rewritten the first time.  If it isn't, wait
     a few seconds and reload.</p>

     <img src="images/Puzzle.jpg"/>
   </body>
 </html>
	<html>
	<body>
	<p>mod_pagespeed will rewrite this image's source to include a content-hash.
	Note that this requires a background asynchronous fetch of the image;
	therefore the page may not be rewritten the first time. If it isn't, wait
	a few seconds and reload.</p>

	<img src="images/Puzzle.jpg"/>
	</body>
	</html>