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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