On 9/17/25 11:10 PM, Rémy Maucherat wrote:
On Wed, Sep 17, 2025 at 10:59 AM William Crowell
<[email protected]> wrote:
Hi, I asked the same question back in April, and here was the combined response
I got from Mark Thomas, Chris Schultz, and Rémy Maucherat:
https://lists.apache.org/thread/l4f9f47hzytr28wvgw1fvl2k2gnplx4j
“The QUIC plans have been on and off. Currently more off than on. If we were
to implement today, it would probably be with panama and a native QUIC stack.
HTTP/3 runs over QUIC. It is a bit of a simplification but QUIC (and therefore
HTTP/3) essentially trades increased CPU usage at the client/server for better
tolerance of poor networks.
Tomcat is not normally directly internet facing. It is typically sat behind
some form of load-balancer and/or TLS termination and/or reverse proxy. In
those scenarios poor network conditions aren't an issue so using QUIC is costs
CPU power which is something folks - particularly those with large
installations - try to minimize. It makes more sense to use HTTP/1.1 in those
scenarios.
Hence there isn't much requirement for an HTTP/3 implementation in Tomcat at
the moment.”
Overall, it's doable, there are some examples in the OpenSSL code that
would most likely work if adapted using FFM. The problem is that it
makes an unreasonably large portion of the Tomcat runtime non JVM
native code, which is probably not acceptable anymore.
I tried about a year ago to use the HTTP/3 openssl API to write a test
server
(https://github.com/openssl/openssl/blob/master/demos/http3/ossl-nghttp3-demo-server.c)
the API wasn't ready to use easily in FFM.
Now that the API is more stable I might have another look, but I agree
with Remy: I am sure we don't want that huge C code in tomcat even
through FFM.
Rémy
Regards,
William Crowell
From: Jee仔 <[email protected]>
Date: Wednesday, September 17, 2025 at 4:45 AM
To: users <[email protected]>
Subject: HTTP/3 (QUIC) support
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Dear Apache Tomcat Team,
I hope this message finds you well. I'm currently exploring HTTP/3 integration
possibilities and noticed that Tomcat doesn't yet natively support this
protocol. Could you kindly share if there are any plans to implement HTTP/3
(QUIC) support in future releases? If so, would you mind providing an estimated
timeline?
Thank you for your time and consideration.
Best regards
Jee仔
[email protected]
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Cheers
Jean-Frederic
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