Using HTTP/2 Server Push with PHP

On May 13, 2016, John Graham-Cumming announced that CloudFlare was supporting HTTP/2 Server Push for all its customers. By simply adding a Link header to an HTTP response specifying preload, CloudFlare would automatically push items to web browsers that support Server Push. The use of Server Push can significantly reduce page load times by pushing resources before the browser asks for them. Experimentation with different types of resources and determining the optimal number of items to push is encouraged.