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.” Regards, William Crowell From: Jee仔 <1176595...@qq.com.INVALID> Date: Wednesday, September 17, 2025 at 4:45 AM To: users <users@tomcat.apache.org> Subject: HTTP/3 (QUIC) support [You don't often get email from 1176595...@qq.com.invalid. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] 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 1176595...@qq.com CAUTION: This email originated from outside of the organization. Do not click on links or open attachments unless you recognize the sender and know the content is safe. This e-mail may contain information that is privileged or confidential. If you are not the intended recipient, please delete the e-mail and any attachments and notify us immediately.
