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--- litespeed_wiki:config:enable-http2 [2017/01/30 19:44]
Jackson Zhang
+++ litespeed_wiki:config:enable-http2 [2021/01/06 20:31]
Lisa Clarke [How to enable HTTP/2] Added SpdyEnabled details
@@ Line 1: / Line 1: @@
-====== How to enable HTTP/2 ======
+====== 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 has supported HTTP/2 out of the box since Enterprise Version 5.0. HTTP/2 and SPDY are enabled by default for SSL listeners.
-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.
+Some things to keep in mind:
+  * 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.
+  * 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 does not depend on the OpenSSL version installed in 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.
+You can enable HTTP/2 with the ''SpdyEnabled'' directive in the ''httpd.conf'' configuration file, or via the WebAdmin Console.
+===== Via Configuration File =====
+In ''httpd.conf'', use the ''SpdyEnabled http2'' directive to enable HTTP/2, like so:
+  <IfModule LiteSpeed>
+  SpdyEnabled http2
+  </IfModule>
+Other valid parameters are ''spdy2'', ''spdy3'', ''http3'' and ''off''.
+**NOTE:** All protocols are enabled by default. When you use this directive to explicitly enable one or more protocols, anything not selected will be //disabled//. For example, ''SpdyEnabled http2'' will only enable HTTP/2. SPDY and HTTP/3 will be disabled.
+===== Via WebAdmin Console =====
+{{ :litespeed_wiki:config:spdyenabled.png?600 |}}
+In the WebAdmin Console, you can find the **Enable SPDY/HTTP2/HTTP3** option in the **SSL** tab for both **Listeners** and **Virtual Hosts**. Select the ''HTTP/2'' option to enable HTTP/2.
+====== 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 |}}
-Also HTTP/2 requires openssl 1.0.2 as minimum.  Openssl versions < 1.0.2 would force HTTP/2 connections to HTTP 1.
-Although HTTP/2 specification does not require TLS, TLS is required by HTTP/2 browser implementations.