How to Set Up Nginx with HTTP/2 Support on Ubuntu 18.04

Nginx is a robust, fast, reliable and dynamic open-source web server popular for serving high traffic sites. In addition, it is well renowned for its ease of configuration, high scalability, and support for a myriad of protocols.
Among the protocols supported by Nginx is the new HTTP/2 protocol whose main advantage over its predecessor HTTP 1.1 is the high transfer speed required for content-rich websites.

In this guide, we will delve in the installation and setup of a secure Nginx server with HTTP/2 Support:

Prerequisites

To start let’s go through the flight check and see whether we have the following

• A server instance of Ubuntu 18.04 LTS
• Nginx version 1.9.5 or higher (To verify the version of Nginx, run nginx -v), read Install Nginx on Ubuntu 18.04.
• OpenSSL version 1.0.2 or higher (Check the version using openssl version)
• A regular, non-root user with sudo privileges
• A Fully Qualified Domain Name (FQDN) In this case, we are going to use crazytechgeek.info purchased from GoDaddy.

  The domain name’s A record should point to the IP address of the server. crazytechgeek.info has been pointed to 216.200.116.207.

  

• An SSL certificate (Either a self-signed certificate or a one from Let’s encrypt SSL. Similarly, you can purchase one form a different provider.

Step 1 – Enabling HTTP /2.0 Support

To start off, it is assumed that you have configured Nginx server block at

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/etc/nginx/sites-available/your_domain

In our case, the server block is /etc/nginx/sites-available/crazytechgeek.info.

Using your favorite text editor, open the server block file and locate the listen directive as shown

The first directive indicates IPv6 connections while the second one is for IPv4 connections

Now, we are going to modify each directive to include a http2 flag as shown

This is going to instruct Nginx to use HTTP/2 on supported browsers

Save the configuration file and exit your editor.

Next, open /etc/nginx/sites-available/default file and make the same changes

Save and exit the text editor.

Just to make sure that there are no syntax errors in any of the Nginx files, run the command below

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$ sudo nginx -t

Output

Step 2 – Purging Old and insecure Ciphers

For HTTP/2 to work as expected, we must avoid using old and insecure ciphers which have been on the HTTP/2 blacklist. Cipher suites are cryptographic algorithms which dictate how traffic is to be encrypted.

If certbot was used to obtain the certificates, then the ciphers in the path /etc/letsencrypt/options-ssl-nginx.conf are not secure enough for HTTP/2. However, modification of this file will only cause errors and prevent certbot from applying updates. This means we must specify our list of ciphers and instruct Nginx to ignore the file

Open the configuration file for your Nginx’s domain server block

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$ vim /etc/nginx/sites-available/crazytechgeek.info

Comment this line

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# include /etc/letsencrypt/options-ssl-nginx.conf;

Below that line, append the line below to define the allowed ciphers

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ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;

Save the file and exit the text editor

If a self-assigned certificate was used, or a third party certificate, then open the file

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/etc/nginx/snippets/ssl-params.conf 

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$ sudo vim /etc/nginx/snippets/ssl-params.conf

Locate the line as shown below

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...
ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384;
...

Modify the file accordingly as shown below

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...
ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;

The finally save and exit the configuration file

Once again check for any Nginx configuration errors

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$ sudo nginx -t

If all went well, you should see the output below as shown earlier

Restart Nginx

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$ sudo systemctl reload nginx

In the next step, we are going to test whether our server can server HTTP/2 pages

Step 3 – Testing If HTTP/2 is enabled

Now let’s test whether HTTP is running and enabled on our Nginx web server
In your terminal, execute the command below

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curl -I -L https://your_domain

In our case, it shall be

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curl -I -L https://crazytechgeek.info

Output

Alternatively, you can verify HTTP/2 by opening Google developer tools by hitting

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Ctrl + Shift + I 

Next, click on Network Tab.

In the Protocol column, be sure to find the label h2

Step 4 – Deploying HTTP Strict Transport Security

Lastly, even though we know very clearly that our server can redirect HTTP requests to HTTPS, we want to enable HSTS HTTP Strict Transport Security to eliminate such redirects. Should a browser chance upon an HSTS header, it will not try connecting to the server again for a certain duration of time. IT will only exchange data via secure and encrypted HTTPS protocol.

To achieve this, Open the Nginx config file

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$ vim /etc/nginx/nginx.conf

Append the line below

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add_header Strict-Transport-Security "max-age=15768000" always;

max-age is set in seconds

If your site has subdomains, and you desire to apply HSTS to all of them, append the includeSubDomains flag at the end of the line

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add_header Strict-Transport-Security "max-age=15768000; includeSubDomains" always;

Save and exit from the config file.

As always, check whether there are any errors

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$ sudo nginx -t

Finally, restart Nginx

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$ sudo systemctl restart nginx

Conclusion

At this point, your Nginx server is now serving HTTP/2 pages.
You can also visit https://tools.keycdn.com/http2-test to test your site’s HTTP/2 status as shown

Alternatively, you can also visit this site

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https://http2.pro/

For more detailed results use

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https://www.ssllabs.com/ssltest/