HTTP\/3 is one of the easiest upgrades you can make for faster web delivery. In this guide, we’ll show you how to enable HTTP\/3 step by step in LiteSpeed Web Server. You’ll also learn what HTTP\/3 is, why it’s important for optimization, and how to check if it’s working. <\/p>\n\n\n\n
LiteSpeed<\/a> is a high-performance web server<\/a> built for speed and efficiency. It stays lightweight yet remains compatible with Apache configurations. Because of that, many admins use it for WordPress<\/a>, eCommerce projects, and other high-traffic sites. In addition, LiteSpeed includes advanced caching and built-in SSL support, which makes it a strong fit for modern web apps. <\/p>\n\n\n\n HTTP\/3 is the newest version of the web\u2019s main protocol. Instead of running on TCP like older versions, it runs on QUIC, which uses UDP. TCP is reliable, but it adds overhead because it checks and confirms packets in a strict sequence. UDP works differently since it is faster and better suited for real-time delivery. That design makes QUIC a smart match for modern websites that need speed and responsiveness. <\/p>\n\n\n\n HTTP\/3 is most useful when your site serves mobile users or international visitors. It also helps when your application depends on real-time interaction, since it handles modern connection behavior more smoothly. Because page speed impacts user experience, HTTP\/3 can also support SEO goals through faster loading and more stable performance. <\/p>\n\n\n\n Before you change any LiteSpeed settings, make sure your setup meets three requirements. <\/p>\n\n\n\n Once these pieces are in place, the actual setup inside LiteSpeed only takes a few minutes. <\/p>\n\n\n\n Start by logging into the LiteSpeed WebAdmin panel in your browser. You can reach it with: <\/p>\n\n\n\n After you log in, go to Configuration \u2192 Server \u2192 SSL<\/strong>. In this section, set Enable QUIC<\/strong> to Yes<\/strong>, and then set Enable HTTP\/3<\/strong> to Yes<\/strong> as well. Once you save the changes, click Graceful Restart<\/strong> so LiteSpeed reloads the configuration without unnecessary disruption. <\/p>\n\n\n\n Even if HTTPS already works, HTTP\/3 will fail if UDP 443 is blocked. Since QUIC uses UDP, you need to allow that traffic through your firewall. If you use firewalld, you can run: <\/p>\n\n\n\n After that, your server can accept HTTP\/3 connections properly. <\/p>\n\n\n\n Once LiteSpeed and your firewall are updated, you should confirm that HTTP\/3 is active. You can test with an online tool like http3check.net<\/a>, which shows whether your site negotiates HTTP\/3. If you prefer the terminal, you can also run: <\/p>\n\n\n\n If the response confirms HTTP\/3, your setup is complete. <\/p>\n\n\n\n If you only want HTTP\/3 enabled for a single site, LiteSpeed also supports per-domain configuration. In that case, go to Configuration \u2192 Virtual Hosts \u2192 YourDomain \u2192 SSL<\/strong>, and enable the same HTTP\/3 settings there. This approach is helpful when you host multiple projects and want tighter control. <\/p>\n\n\n\n If you prefer a visual walkthrough, check out the connected YouTube video for this guide. <\/p>\n\n\n\nWhat Is HTTP\/3 and the QUIC Protocol\u00a0<\/h2>\n\n\n\n
When Should You Use HTTP\/3\u00a0<\/h2>\n\n\n\n
What You Need Before You Start\u00a0<\/h2>\n\n\n\n
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How to Enable HTTP\/3 in LiteSpeed\u00a0<\/h2>\n\n\n\n
https://your-ip:7080 <\/code><\/pre>\n\n\n\nUpdate Your Firewall for UDP 443\u00a0<\/h2>\n\n\n\n
sudo firewall-cmd --permanent --add-port=443\/udp \nsudo firewall-cmd --reload <\/code><\/pre>\n\n\n\nTest If HTTP\/3 Is Working\u00a0<\/h2>\n\n\n\n
curl -I --http3 https:\/\/yourdomain.com<\/a> <\/code><\/pre>\n\n\n\nOptional Per-Domain Settings\u00a0<\/h2>\n\n\n\n
Watch Our YouTube Video on HTTP\/3 in LiteSpeed Web Server\u00a0<\/h2>\n\n\n\n