With the HTTP/2 behavior enabled, this behavior requests a specified set of domains that relate to your property hostname, and keeps the connection open for faster loading of content from those domains.

Features and options

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A newer version is included in an Ion property

If you're using ​Akamai​'s Ion to deliver your site or app, we recommend that you use the newer version of this feature that's included with its Adaptive Acceleration service. Adaptive Acceleration is added by default to a new Ion property.