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Setting up HTTP/2 support in OpenLiteSpeed mirrors the process for setting up SPDY support:
When compiled from source, OpenLiteSpeed does not have HTTP/2 support compiled by default. HTTP/2 support must be [[Help:Install:OpenLiteSpeed_with_HTTP2_Installation_Notes#Install OpenLiteSpeed with
HTTP/2 enabled|specifically enabled]] when compiling.
Compiling HTTP/2 requires OpenSSL 1.0.1 or higher. Many, but not all, operating systems come with a high enough version of OpenSSL. (Specifically, CentOS 5 is shipped with OpenSSL 0.9.8.) This wiki will take you through the steps for checking your OpenSSL version, installing a newer version (if necessary), and compiling OpenLiteSpeed with HTTP/2.