What are the prefetching hints?
The browser looks for either an HTML <link> tag or an HTTP Link: header with a relation type of either next or prefetch. An example using the <link> tag follows:
<link rel="prefetch" href="/images/big.jpeg">The same prefetching hint using an HTTP Link: header:
Link: </images/big.jpeg>; rel=prefetchThe Link: header can also be specified within the HTML document itself by using a HTML <meta> tag:
<meta http-equiv="Link" content="</images/big.jpeg>; rel=prefetch">
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