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--- litespeed_wiki:config:enable-http2 [2015/07/24 15:20]
Michael Alegre created
+++ litespeed_wiki:config:enable-http2 [2017/11/29 15:22]
Jackson Zhang [How to check if HTTP/2 is enabled?]
@@ Line 1: / Line 1: @@
 ====== How to enable HTTP/2 ======
-The LiteSpeed web server support HTTP/2 since enterprise version 5.0. HTTP/2 is enabled by default for SSL listener configured from httpd.conf. And it can be customized via "SpdyEnabled" directive.
+LiteSpeed Web Server supports HTTP/2 out of the box since the introduction of Enterprise Version 5.0. HTTP/2 is enabled by default for the SSL listeners configured in httpd.conf and Web GUI. HTTP/2 can be customized via "SpdyEnabled" directive.
+SPDY is also enabled by default since the introduction of Enterprise Version 5.0. However, if using a front-end SSL proxy server, enabling SPDY or HTTP/2 on LiteSpeed Web Server will have no effect, as front-end SSL proxies are not capable of forwarding SPDY and HTTP/2 requests.
+Please note, HTTP/2 requires OpenSSL 1.0.2 as minimum. OpenSSL versions less than 1.0.2 will force HTTP/2 connections to HTTP/1. However, LiteSpeed Enterprise Web Server is staticly linked with latest OpenSSL 1.0.2 release and it does not depends on the OpenSSL version coming with the system.
+HTTP/2 should work out of box for all HTTPS sites with LiteSpeed.
+Although HTTP/2 specification does not require TLS, TLS is required by browser implementations.
+====== How to check if HTTP/2 is enabled? ======
+Though you can use the third party web tools to check, the most common and easy way to check is through browser's developer tools.
+h2 and http/2 mean HTTP/2 has been enabled for your server.
+{{ :litespeed_wiki:config:http2-protocal.png?800 |}}
+If you use third-party web tools, it could show as the following:
+{{ :litespeed_wiki:config:http2-checker-tool.png?600 |}}
-SPDY is also enabled by default. However, enabling SPDY or HTTP/2 on backend LiteSpeed web server has no effect to end users if there is a front-end SSL proxy server and front-end SSL proxy is not capable of forwarding SPDY and HTTP/2 requests.
-Although HTTP/2 specification does not require TLS, TLS is required by HTTP/2 browser implementations.