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How to fix the below error and enable HTTP/2 in Amazon EC2 Instance

#Enable_HTTP/2 #Amazon #EC2 #Apache

Error Message:

"The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive."

Important:

  1. Take a backup of your conf files and folders before trying any the below commands.
  2. **** Your website should already be configured to run on https, else HTTP/2 will not work *****

Run the below command:

httpd -V | grep MPM

Output will be:

Server MPM:     prefork

We are going to change this and start using event

Step 1: 

httpd -v

Ensure your httpd version is greater than or equal to 2.4.37

Server version: Apache/2.4.37 (Amazon)

Step 2: Modify the 00_mpm.conf

cd /etc/httpd/conf.modules.d
vi 00-mpm.conf

Uncomment the following line:

LoadModule mpm_event_module modules/mod_mpm_event.so

and comment the below lines if they are enabled:

LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
LoadModule mpm_worker_module modules/mod_mpm_worker.so

Save the file by pressing 'Esc' button :wq!

Run the below command:

httpd -V | grep MPM

Output will be:

Server MPM:     event

Step 3:

cd /etc/httpd/conf

vim httpd.conf

Add the below lines to bottom of the page:

Protocols h2 http/1.1

Protocols h2 h2c http/1.1

Step 4:

sudo service httpd restart

sudo service mysqld restart

Step 5:

Ensure your website is still up and running without any issues

Check if HTTP/2 is successfully enabled using the below website:

https://http2.pro/

Disclaimer: We are not held responsible if something goes wrong

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