SD,
Thanks for your research. I had tried the same trick of posting the URL and came up with the same error. I had never heard of .webp before. I'll do some more digging.
Given that links to a valid image, any HTTP compliant browser should have no problem with it.
crablab,
You are right. Any HTTP compliant browser
should display the image, but it doesn't! See SD's response. It is a Google specific issue.
Here's some background to the issue:
http://arstechnica.com/information-t...-webp-support/