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litespeed_wiki:config:enable-http2 [2017/01/30 21:52] Johathan Kagan |
litespeed_wiki:config:enable-http2 [2021/01/06 20:44] (current) Lisa Clarke [Via Configuration File] Clarified SpdyEnabled usage |
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- | ====== How to enable HTTP/2 ====== | + | ====== How to Enable HTTP/2 ====== |
- | 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. | + | 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 since Enterprise Version 5.0. However, enabling SPDY or HTTP/2 on backend LiteSpeed Web Servers 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''. | ||
+ | |||
+ | All protocols are enabled by default. As such, if you wish to use SPDY, HTTP/2, and HTTP/3, there is no need for a ''SpdyEnabled'' directive at all. | ||
+ | |||
+ | When you use this directive to explicitly enable one or more protocols, anything not selected will be //disabled//. For example, ''SpdyEnabled http2'' will enable HTTP/2, while 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 |}} | ||
- | 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. | ||
- | Although HTTP/2 specification does not require TLS, TLS is required by browser implementations. |