QUIC Protocol
UDP-based QUIC eliminates TCP's head-of-line blocking problem. Each stream operates independently — a lost packet does not affect other flows.
HTTP/3 + QUIC Protocol
The Web Protocol of Tomorrow —
The Web Protocol of Tomorrow —
Fly with HTTP/3
Full speed even under packet loss with QUIC-based HTTP/3. Optimised for mobile users; perfect for Core Web Vitals.
HTTP/3 Active
QUIC Protocol
All Browsers
Mobile Optimised
0-RTT
6 Core Features of HTTP/3 and QUIC
Every layer directly impacts the speed and reliability of your website.
0-RTT Connection
Returning visitors connect instantly with zero round-trip time. Page load times drop dramatically on every repeat visit.
Multiplexed Streams
Parallel, independent data streams over a single connection. CSS, JS, and image files download simultaneously — stream independence prevents bottlenecks.
Mobile Optimisation
Connections are not dropped when switching from Wi-Fi to 4G. The QUIC session ID survives network changes transparently — a flawless mobile experience.
Built-in TLS 1.3
QUIC carries encryption within the protocol itself. No separate TLS handshake is needed, reducing connection time and ensuring end-to-end security.
HTTP/2 Fallback
Older browsers that do not support HTTP/3 automatically fall back to HTTP/2. Users notice nothing; backward compatibility is guaranteed.
HTTP Protocol Comparison
Why does HTTP/3 lead across every criterion?
| Feature | HTTP/3 (QUIC) | HTTP/2 (TLS) | HTTP/1.1 |
|---|---|---|---|
| Transport Layer | UDP (QUIC) | TCP | TCP |
| Head-of-Line Blocking | None | Stream Level | Present |
| 0-RTT Connection | Supported | 2–3 RTT | 3+ RTT |
| Packet Loss Tolerance | High | Medium | Low |
| Mobile Performance | Excellent | Good | Average |
| LiteSpeed Support | Full | Full | Available |
| Encryption | Built-in (TLS 1.3) | TLS separate | None |
Who Is HTTP/3 Hosting Ideal For?
If speed, reliability, and mobile performance are your priorities, HTTP/3 is built for you.
Sites with a Mobile Audience
Flawless experience on variable networks like 4G/5G thanks to QUIC's packet-loss tolerance. Connections are not dropped during network switches — users stay on the page.
- Seamless Wi-Fi → 4G transitions
- High packet-loss tolerance
- QUIC session continuity
E-Commerce Stores
Milliseconds on the checkout page directly affect conversion rates. Returning visitors connect instantly via 0-RTT — cart abandonment rates drop.
- Instant connection with 0-RTT
- Higher conversion rates
- Improved Core Web Vitals
Media & Video Sites
Large images and video files load concurrently via parallel streams. Stream independence means a single large file never blocks the others.
- Parallel stream delivery
- Speed boost for large files
- Stream independence
Sites with a Global Audience
Minimises geographical latency and network-quality disparities. Delivers a consistent, low-latency experience for visitors from different countries.
- Reduced geographical latency
- Consistent global performance
- Network-quality gap minimised
Get Started with HTTP/3 Hosting in 3 Steps
No configuration required — there is nothing you need to do to activate it.
Choose an HTTP/3 Hosting Plan
Select the plan that suits your needs from the Netislem hosting catalogue. All plans include HTTP/3 and QUIC support — no extra charge or add-ons required.
Browse PlansMigrate or Set Up Your Site
Transfer your existing site using our free migration service, or set up a brand-new site. Domain, DNS, and SSL configuration are handled by our support team — no technical knowledge required.
HTTP/3 Is Live — Automatically, No Action Needed
The moment your SSL certificate is activated, HTTP/3 and QUIC are enabled automatically. Modern browsers detect HTTP/3; older browsers fall back to HTTP/2 automatically. No configuration is required on your part.
Frequently Asked Questions
If your question is not answered here, contact us.
What is the difference between HTTP/3 and HTTP/2?
HTTP/3 runs on the UDP-based QUIC protocol. Unlike TCP, when packet loss occurs the entire stream is not blocked — only the affected flow is retransmitted. This provides a far more stable and faster connection experience compared to HTTP/2, especially on mobile and variable networks.
Does HTTP/3 benefit SEO?
Yes. HTTP/3 improves the Google Core Web Vitals metrics LCP (Largest Contentful Paint) and FID (First Input Delay). Because Google uses these metrics in its page-experience ranking, faster loading translates directly into a search ranking advantage.
Do all browsers support HTTP/3?
Current versions of Chrome, Firefox, Edge, and Safari fully support HTTP/3. Older browsers that do not support HTTP/3 automatically fall back to HTTP/2; users never notice the transition and all visitors continue to be served.
Does HTTP/3 offer a specific advantage for mobile users?
Yes. On variable mobile networks such as 4G/5G, HTTP/3's packet-loss tolerance delivers significantly better performance. The connection is not dropped when switching from Wi-Fi to mobile data; the QUIC session ID is preserved across network changes so users remain on the page.
Experience the Future of the Web with HTTP/3 — Today
All our hosting plans come with HTTP/3 and the QUIC protocol. Activated automatically after SSL setup — no configuration, no extra cost.