Re: Working towards HTTP3 - current MPM's only support TCP connections

Dear httpd developers,

HTTP/3 support in httpd has been a long-awaited feature, and it is great 
to see this work moving forward.

I reviewed Machine Moon's mod_http3 implementation and have been 
maintaining a fork with additional work aimed at making it practical for 
existing httpd 2.4.x installations and bringing its behavior closer to 
mod_http2, mod_ssl, and the httpd core.

Among other things, I added stock httpd 2.4.52+ compatibility, 
mod_ssl-compatible SSL_* environment variables, request header limit 
handling, H3 stream timeouts and abuse limits, QPACK dynamic table 
support, configurable worker limits, TLS session ticket and early-data 
controls, and several QUIC I/O and lifecycle fixes.

We have been building and testing it with httpd 2.4.68 and are very 
happy with the results so far.

I would also like to ask whether there is interest in bringing this 
functionality to the official 2.4.x branch. There is a large installed 
base on 2.4.x, and having HTTP/3 available there would make the feature 
much more accessible without requiring users to wait for or immediately 
migrate to the next major httpd release.

If httpd PR #699 pull request against the 2.4.x branch would be useful, 
I would be happy to prepare and submit one.

My fork with the additional changes is here:
https://github.com/xl32/mod_http3 <https://github.com/xl32/mod_http3>

Thank you for your work on httpd!


Best regards,
Oleksandr Gerasymov
CIO
CodeIT
CodeIT Logo
*W*: codeit.pro <https://codeit.pro>

On 8/7/2026 5:05 PM, Steffen wrote:
> Good day,
>
> Developing an HTTP3 module for Apache HTTPD is something that is 
> desperately needed, noting alternative web servers already offer HTTP3 
> support, e.g. NGINX and Caddy.
>
> Whilst there's evidence of people actively working towards this, e.g. 
> https://github.com/machine-moon/mod_http3, it's evidently not possible 
> with the current 2.4.x code branch. To that end PR#699 
> https://github.com/apache/httpd/pull/699 has been raised, as a 
> workaround to allow (some) MPM's to note connections that are not TCP 
> based.
>
> The following post provides a detailed insight to these issues - 
> https://codeit.guru/apache-http3-pr-699-mpm-quic-backport-2-4-68
>
> We believe it would be really helpful if PR#699 could be approved for 
> subsequent 2.4.x releases, and equally whether similar functionality 
> could be added to mpm_winnt, so support for HTTP3 could be developed 
> for Windows platforms too.
>
> ---
>
> Regards
>
> Steffen Pete