Enabling HTTP/2 or HTTP/3 for WordPress

HTTP/2 or HTTP/3 are made to presend internal CSS and JS to the browser to optimize page loading.

The two protocols offer clients virtually identical feature sets.

  • Both protocols offer server push support
  • Both protocols have header compression, and QPACK and HPACK are similar in design.
  • Both protocols offer multiplexing over a single connection using streams

HTTP/3 is designed for QUIC, which is a transport protocol that handles streams by itself.

HTTP/2 is designed for TCP, and therefore handles streams in the HTTP layer.

Benefits of HTTP/2 or HTTP/3

Both options are multiplexed – that is they can send multiple requests for data in parallel over a single TCP connection. This allows the user to download multiple web files via Async from a server.

Header compression is utilised to reduce overheads.

Responses can be pushed proactively into the users browser cache instead of waiting for a request for each response.

Can I enable HTTP/2 or HTTP/3?

Enabling HTTP/2 or HTTP/3 is up to your server/host, rather than the technical stack.

Some hosts may not support this, but if they do, then it is likely automatically turned on for you if you are under a Managed Hosting plan.

If you have your own server setup, then you can search for what to install to enable HTTP/2 or HTTP/3, such as this guide for Nginx on Ubuntu 18.04.

Need Help Moving to a Host With HTTP/2 or HTTP/3?

This is part of our optimization service if you choose to host with us, or one of our recommended Managed Hosts. We can help you optimize your site above and beyond this, just let us know what you are trying to achieve, and we will let you know how we can help.