Although Google has announce to drop SPDY support by early February 2016 in favor of HTTP/2, SPDY remains the best HTTP protocol extension to maximize compression and reduce webpage load latency.
The current and final SPDY implementation supported by Mozilla Firefox and Google Chrome is SPDY/3.1.
In order to check if your webserver supports SPDY 3.1, just simply:
- Go to your website, eg: https://blog.mypapit.net/
- Using Chrome, type – “chrome://net-internals/#spdy” at the addressbar
- You should see your website name and spdy/3.1 protocol listed, refer to Screenshot below
Additionally, you could go to spdycheck.org to check if your web server supports SPDY.