Server Push supported on LiteSpeed Web Server

Server Push is a method of information delivery where a server pushes a resource directly to the client without first receiving a request to do so. By doing this the server can attempt to anticipate client requests and pre-push them into the client’s cache in an effort to avoid the usual request-response round trip delay.

1. LiteSpeed Enterprise 5.2+
2. Site use HTTPS
3. Browser support HTTP/2

We are going to introduce how to verify Server Push with WordPress+LScache Site and CloudClare. If you want to try server push manually, please refer Server Push.

1. Server Cache Setup
2. WordPress Installation
3. LSCache for WordPress

• Check browser version
  
• We can verify browser support HTTP/2 simply by visiting Akamai online tool

1. Navigate to WordPress Control Panel>LSCache>Settings>Optimize tab
2. Set CSS HTTP/2 Push and JS HTTP/2 Push as On

• If you only enable CSS HTTP/2 Push. Header will looks like this:
  
  
• If you enable both CSS HTTP/2 Push and JS HTTP/2 Push. Header will looks like this:
  
  

Why we use CloudFlare? Cloudflare supports HTTP/2 Server Push with the Link header field on all plan levels. Cloudflare will look for the Link header field, as outlined in RFC 5988, in response headers from the origin server and extract URI-references with parameters rel=preload. These URI will be pushed to the client.

Follow this blog to Setup CDN from LSCache

• If you only enable CSS HTTP/2 Push. Header will looks like this:
  
  
• If you enable both CSS HTTP/2 Push and JS HTTP/2 Push. Header will looks like this: