<https://w3speedup.com/#/schema/person/image/>
<http://schema.org/contentUrl>
<https://secure.gravatar.com/avatar/cae2bb42abc5e5a7c96336596d4e1d8b?s=96&d=mm&r=g>
<https://w3speedup.com/how-caching-optimization-can-help-improve-your-website-speed/>