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Enabling HTTP/2 protocol support in Nginx, on the CRYSTAL v1.0 project

add: Jul 4 2025

upd: Jul 4 2025

HTTP/2 is a modern version of the HTTP protocol designed to address the limitations of HTTP/1.1 and improve the performance of web applications.


Key technical improvements:

  • Multiplexing: multiple requests and responses are transmitted simultaneously over a single TCP connection, without blocking.
  • Header Compression (HPACK): reduces data redundancy and speeds up data exchange.
  • Server Push: allows the server to pre-send resources such as styles, scripts, and images before the browser itself requests them. This reduces latency and speeds up page loading.
  • Binary format: simplifies parsing HTTP messages on the server and client side, which reduces overhead and speeds up data transfer.
  • Prioritization: critical resources (such as CSS or JavaScript) are transferred to the client with priority, speeding up page rendering.

In addition to improving performance, HTTP/2 improves site security by mandating the use of TLS in most browsers, modern cryptographic algorithms, and protecting against a number of attacks relevant to HTTP/1.1.


To enable support for the HTTP/2 protocol, run the commands below in sequence:

nano /etc/nginx/sites-available/crystal

In the window that opens, find all lines of the following type:

listen 443 ssl;

and replace them with:

listen 443 ssl http2;

After replacing, press sequentially - 'ctrl + x', 'y', 'Enter'.


Next, enter the command:

systemctl restart nginx && curl -I --http2 https://YourDomain

The first line of the output should contain - 'HTTP/2 200', this means that the protocol connection - HTTP/2, successful.


You can make the site much more secure by adding some rules to the Nginx server, according to this instructions.

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