Hi Is http2 faster than http 1.1 and does it play well with zend opcache and memcache?
HTTP/2 is at protocol level so doesn't interfere with php opcache/memcache/redis etc. You will want to read up on benefits of HTTP/2 and a few threads here WebPerf - Google dropping SPDY in favor of HTTP 2 SSL - HTTP/2 - h2o vs OpenLiteSpeed vs Nginx SPDY/3.1 SSL - Nginx SPDY/3.1 vs h2o HTTP/2 vs non-https benchmarks & tests Nginx HTTP/2 protocol to succeed Google SPDY Nginx HTTP/2 vs Nginx SPDY/3.1 vs Nginx HTTP/1.1 ngx_pagespeed http/2 tag SSL - HTTP/2 tech demo Ilya Grigorik's slide presentation on HTTP/2 at VelocityConf SSL - HTTP/2 101 Video at Chrome Dev Summit 2015 HTTP/2 Links & Info HTTP/2 - Wikipedia, the free encyclopedia HTTP/2 Frequently Asked Questions Chromium Blog: Hello HTTP/2, Goodbye SPDY HTTP/2: A Fast, Secure Bedrock for the Future of SEO - Moz The Shift from SPDY to HTTP/2 Performance Calendar ยป HTTP 2.0 is coming, be ready Architecting Websites For The HTTP/2 Era A Simple Performance Comparison of HTTPS, SPDY and HTTP/2
Of course it is very very faster Actually, That image shows the everything. I think, only disadvantage is required the SSL for now.
While technically possible, no browser or server actually supports un-encrypted http/2 and it is highly unlikely to be added baring new laws forcing it.