Why Use LiteSpeed's QUIC Server? https://litespeedtech.com/images/logos/litespeed/ls-quic-logo.png 2018-11-13 22:08:23 With LiteSpeed QUIC you get production-quality, availability to millions of websites, Anti-DDoS expertise, and more.

Why use LiteSpeed’s QUIC

LiteSpeed's QUIC web server implementation is special.

You get production-quality, availability to millions of websites, Anti-DDoS expertise, and more.

LiteSpeed QUIC Logo

Delivering Cutting-Edge Technology

Staying at the forefront of web technologies is what we do. We were the first to support SPDY/3.1. We were the first to support HTTP/2, at one point powering 96.5% of all HTTP/2-enabled websites.

Our customers demand cutting-edge technologies such as QUIC. We are happy to deliver.

If you are already using LiteSpeed Web Server, all you need is the 5.2+ release, as QUIC is enabled by default. (There are also finer-grained controls to configure QUIC per listener, per vhost, and so on.) If you are thinking about switching to LiteSpeed, good! Did you know that it is a drop-in Apache replacement?


Production Quality

LiteSpeed QUIC is production-quality and available to millions of websites.

At the time of this writing, we only know of four working server-side QUIC implementations:

Here at LiteSpeed, we pride ourselves on the proven performance of our products, in particular that of the web server and web ADC. Our QUIC implementation is built using the same principles and runs using the same speedy framework.


LiteSpeed's anti-DDoS expertise is vital when using UDP, which is prone to DDoS attack.

UDP's simplified handshake implementation makes it more vulnerable to DDoS attack, when compared to TCP. LiteSpeed's anti-DDoS expertise offers an important level of protection.

Because LSWS's event-driven architecture handles all connections with a single process (or a few processes), LiteSpeed is easily able to gather data about the number of connections or amount of bandwidth an IP is using. This allows the server to impose limits in an efficient manner.

Other process-based servers have trouble implementing features like this because they need to collect information from their many processes. By the time they know which IP to block, it's too late.

Anti-DDos at UDP

Multi-Process and Event Driven

LiteSpeed's Multi-process, event-driven architecture scales well.

The QUIC protocol is CPU bound, as it needs to encrypt the traffic. Throughput can be maximized through the use of multiple CPU/cores.

Many processes use the same UDP port to receive and send QUIC packets. Because connection state is stored in a single process, a packet may need to be rerouted after it is read. This poses a challenge to the effective handling of packets that are received on the same port by different processes. LiteSpeed's multi-process, event-driven architecture rises to this challenge nicely. In order to route a packet to its designated process, LiteSpeed uses lightweight IPC mechanisms: shared memory and signals. Deep copies of packet data and expensive socket API calls are completely avoided.

LiteSpeed's QUIC implementation scales up with the number of CPU cores.


LiteSpeed QUIC supports server push.

QUIC server push allows you to send information to the user's browser without waiting for it to be requested. In some cases, this can make pages load twice as fast! LiteSpeed's QUIC implementation supports server push, but Caddy's does not.

Server Push

LiteSpeed QUIC is faster!

LiteSpeed Web Server has a proven track record of reducing server load and improving response time. Add to that QUIC's innate ability to mitigate common latency problems, and you've got an impressive pairing!

LiteSpeed's QUIC implementation is on average 3.5 times faster than Caddy's.


LiteSpeed QUIC can be used as a proxy

You can use LiteSpeed Web ADC as a QUIC-to-HTTP proxy in front of your website. In addition to the performance boost provided by QUIC, your site will get the benefit of ADC caching.

LiteSpeed as Proxy

What's New With QUIC


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