instant

Property Manager name: Akamai Instant (Prefetching)
Behavior version: The v2024-10-21 rule format supports the instant behavior v1.1.
Rule format status: GA, stable
Access: Read/Write
Allowed in includes: Yes

The Instant feature allows you to prefetch content to the edge cache by adding link relation attributes to markup. For example:

xml <a href="page2.html" rel="Akamai-prefetch">Page 2</a>

Default link relation values are prefetch and Akamai-prefetch. Applies only to HTML elements that may specify an external file: <a>, <base>, <img>, <script>, <input>, <link>, <table>, <td>, or <th>. (For the latter three, some legacy browsers support a nonstandard background image attribute.)

This behavior provides an alternative to the prefetch and prefetchable behaviors, which allow you to configure more general prefetching behavior outside of markup.

Option	Type	Description	Requires
`prefetchCacheable`	boolean	When enabled, applies prefetching only to objects already set to be cacheable, for example using the `caching` behavior. Only applies to content with the `tieredDistribution` behavior enabled.		{"displayType":"boolean","tag":"input","type":"checkbox"}
`prefetchNoStore`	boolean	Allows otherwise non-cacheable `no-store` content to prefetch if the URL path ends with `/` to indicate a request for a default file, or if the extension matches the value of the `prefetchNoStoreExtensions` option. Only applies to content with the `sureRoute` behavior enabled.		{"displayType":"boolean","tag":"input","type":"checkbox"}
`prefetchNoStoreExtensions`	string array	Specifies a set of file extensions for which the `prefetchNoStore` option is allowed.	`prefetchNoStore` is `true`	{"displayType":"string array","tag":"input","todo":true} {"if":{"attribute":"prefetchNoStore","op":"eq","value":true}}
`prefetchHtml`	boolean	Allows edge servers to prefetch additional HTML pages while pages that link to them are being delivered. This only applies to links from `<a>` or `<link>` tags with the appropriate link relation attribute.	`prefetchCacheable` is `true` OR `prefetchNoStore` is `true`	{"displayType":"boolean","tag":"input","type":"checkbox"} {"if":{"op":"or","params":[{"attribute":"prefetchCacheable","op":"eq","value":true},{"attribute":"prefetchNoStore","op":"eq","value":true}]}}
`customLinkRelations`	string array	Specify link relation values that activate the prefetching behavior. For example, specifying `fetch` allows you to use shorter `rel="fetch"` markup.	`prefetchHtml` is `true`	{"displayType":"string array","tag":"input","todo":true} {"if":{"attribute":"prefetchHtml","op":"eq","value":true}}