Apache Module: HTTP2


Last modified: August 28, 2019

Overview

The mod_http2 Apache module provides HTTP/2 support for the Apache HTTP server.

Important:

Most browsers only support HTTP/2 via encrypted (https) connections.

Usage

This module can increase the loading speed and security of your web pages. To obtain these benefits, you must adjust your server’s configuration.

Note:

HTTP/2 is resource intensive and can increase your server’s memory usage.

You can edit the mod_http2 Apache module’s .conf file at the following location:

/etc/apache2/conf.d/http2.conf

For more configuration information, read Apache’s mod_http2 documentation.

Requirements

This module requires EasyApache 4 and Apache 2.4.

Compatibility

The mod_http2 Apache module is not compatible with 32-bit CentOS 6 systems or with the DSO PHP handler. This module also isn’t compatible with these other Apache modules:

  • mod_mpm_itk
  • mod_mpm_prefork

On new installations of cPanel & WHM, the system installs the mod_mpm_prefork module by default. To check the MPMs that your system uses, run the following command:

rpm -qa | grep mpm

The output may resemble the following example:

ea-apache24-mod_mpm_prefork-2.4.34-3.el7.cloudlinux.x86_64

How to install or uninstall the module

In the interface

Install or uninstall the mod_http2 Apache module with WHM’s EasyApache 4 interface (WHM >> Home >> Software >> EasyApache 4).

On the command line

You must manually uninstall the mod_mpm_prefork or mod_mpm_itk modules and install either the worker or event MPM for the mod_http2 Apache module to work correctly. To do this, perform the following steps as the root user:

  1. Open a yum shell session. To do this, run the yum shell command.

    Note:

    For more information about yum shell, read the man7.org Yum documentation.

  2. Run either of the following series of commands:

    > remove ea-apache24-mod_mpm_prefork
    > install ea-apache24-mod_mpm_event ea-apache24-mod_http2
    > ru
    

    > remove ea-apache24-mod_mpm_itk ea-apache24-mod_mpm_prefork
    > install ea-apache24-mod_mpm_event ea-apache24-mod_http2
    > run
    

  3. Enter y to remove and install the specified packages. When the system completes this task, a Finished Transaction message will appear.

  4. Exit the yumshell session. To do this, run the exit command.

To uninstall the mod_http2 Apache module in EasyApache 4, run the following command:

yum remove ea-apache24-mod_http2

Additional Documentation