HTTP/2 Server Push

This plugin automatically implements HTTP/2 Server Push for a site's critical assets, primarily targeting developers and site administrators focused on performance optimization. It works by sending Link headers for enqueued scripts and stylesheets, instructing compatible servers to push these resources to the client before they are requested, reducing latency and improving perceived load times.

• Automatic Resource Collection: Gathers all scripts and styles registered by the wp_enqueue_scripts hook, eliminating the need for manual configuration of core assets.
• Flexible Delivery Method: By default, uses HTTP headers for efficiency but can fall back to emitting HTML <link> elements if headers have already been sent, ensuring compatibility.
• Customizable Resource List: The h2push.push_resources filter allows developers to add other critical assets like fonts, images, or third-party resources to the push list.
• Host Control: Includes the h2push.is_allowed_push_host filter to define which external domains are permitted for resource pushing, maintaining security and control.
• Behavior Tuning: The h2push.as_header filter lets developers force the use of <link> elements instead of headers, useful for testing or when a server does not support HTTP/2.