Apache httpd : Configure mod_http22022/03/16

	Configure [mod_http2] to use HTTP/2.
[1]	Configure SSL/TLS settings, refer to here. (many Web browsers support HTTP/2 only on HTTPS connection)
[2]	On RHEL 9 / CentOS Stream 9, [mod_http2] is installed with [httpd] package for dependency but if not installed, Install it.

[root@www ~]#

dnf -y install mod_http2

[3]	Configure [mod_http2]. It's possible to set it for each virtual hostings.

# [mod_http2] module is enabled by default

[root@www ~]#

cat /etc/httpd/conf.modules.d/10-h2.conf

LoadModule http2_module modules/mod_http2.so

# configure [mod_http2] to any virtual host sites you'd like to set

[root@www ~]#

vi /etc/httpd/conf.d/dlp.srv.world.conf

# add [Protocols ***] line

<VirtualHost *:443>
    Protocols h2 http/1.1
    DocumentRoot "/var/www/dlp"
    ServerName dlp.srv.world:443
    ErrorLog logs/dlp_ssl_error_log
    TransferLog logs/dlp_ssl_access_log
    LogLevel warn
    SSLEngine on
    SSLHonorCipherOrder on
    SSLCipherSuite PROFILE=SYSTEM
    SSLProxyCipherSuite PROFILE=SYSTEM
    SSLCertificateFile /etc/letsencrypt/live/dlp.srv.world/cert.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/dlp.srv.world/privkey.pem
    SSLCertificateChainFile /etc/letsencrypt/live/dlp.srv.world/chain.pem
</VirtualHost>

[root@www ~]#

systemctl restart httpd

# verify accesses
# OK if [HTTP/2] is shown

[root@www ~]#

curl -I https://dlp.srv.world/

HTTP/2 200
date: Tue, 15 Mar 2022 07:57:55 GMT
server: Apache
last-modified: Tue, 15 Mar 2022 07:57:42 GMT
etag: "86-5da3d26c84ad7"
accept-ranges: bytes
content-length: 134
content-type: text/html; charset=UTF-8

It's possible to see HTTP/2 in response header from Web browser access. The example below is on Google Chrome.
If HTTP/2 is enabled, [Protocol] in response header turns to [h2] like follows.

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