Serving PHP on HTTP/2 with H2O and HHVM (Symfony, WordPress, Drupal...)
HTTP/2 as a protocol was locked down in February 2015 and published in the May of same year. It's the first major revamp of the most important (IMHO) protocol since 1999. It's no silver bullet, but the upgrade offers improvements that will make a big difference when applied in scale. Help save the planet (yes, really) and start deploying today!