View source for Http/3

=Introduction=
This is a page for the new HTTP/3.
=Overview=
Not an expert but have read [https://www.smashingmagazine.com/2021/08/http3-core-concepts-part1/]. I guess what I took from it was that it will be more pluggable and not tied to propriety implmentation of TCP. This may enable faster progress on improving the protocol going forward.
[[File:HTTP3.png|600px]]
=Nginx=
==Building==
This is not detailed but here is what I had to do. At the time I was on ubuntu 21.04 and using 1.21.4. Mostly I followed the instructions on [https://codefaq.org/server/how-to-install-http-3-quic-on-nginx-server-for-ubuntu/ here]. I cam unstuck when building the packages ie. dpkg-buildpackage -b. This has an error due to GLIB changes.
<syntaxhighlight lang="bash">
pagespeed_ol_apr_signal_description_get':
signals.c:(.text.apr_signal_description_get+0xe): undefined reference to sys_siglist' collect2: error ：ld return 1 make[1]: *** [objs/Makefile:457：objs/nginx] error 1
</syntaxhighlight>
This error is with a package called psol which is a binary distribution so we need to build psol manually. The instructions can be found [https://www.modpagespeed.com/doc/build_mod_pagespeed_from_source here]. This took a long time to get a beer. Once finished you find there still is no psol. You need to run install/build_psol.sh from the source root directory. This will also fail too as we have not fixed the source. We need to 
<syntaxhighlight lang="bash">
sed -i -r 's/sys_siglist\[signum\]/strsignal(signum)/g' third_party/apr/src/threadproc/unix/signals.c
</syntaxhighlight>
once build we need to change the directory name to line up with the original nginx build
<syntaxhighlight lang="bash">
cd ..
mv incubator-pagespeed-mod include
</syntaxhighlight>
Now we need to go back to nginx and put fix the soft links. Fir boringssl
<syntaxhighlight lang="bash">
cd <nginx_src>/debian/modules
ln -s ~/boringssl .
</syntaxhighlight>
Now psol
<syntaxhighlight lang="bash">
cd <nginx_src>/debian/modules/ngx_pagespeed/psol
mv include include_old
ln -s ln -s ~/bin/incubator-pagespeed-mod include
</syntaxhighlight>
Now we should be able to build with dpkg-buildpackage -b. Once build install
==Configuring==
This is an example of my config. In the instruction I followed some of the configuration had been removed.
<syntaxhighlight lang="nginx">
server {
        server_name www.bibble.co.nz bibble.co.nz;
# Added for http/3
    listen 443 http3 quic reuseport;
    listen 443 ssl http2;

    quic_retry on;
    ssl_early_data on;

#    http3_max_field_size 5000;
    http3_max_table_capacity 50;
    http3_max_blocked_streams 30;
    http3_max_concurrent_pushes 30;
    http3_push 10;
    http3_push_preload on;

    add_header Alt-Svc 'h3=":443"; ma=86400';


        root /mnt/lovelyjubbly;
        index index.php index.html index.htm index.nginx-debian.html;
        access_log /var/log/nginx/www.lovelyjubbly.co.nz.log;
        error_log  /var/log/nginx/www.lovelyjubbly.co.nz.log error;


        ssl_certificate     /etc/letsencrypt/live/www.lovelyjubbly.co.nz/fullchain.pem;
        ssl_certificate_key  /etc/letsencrypt/live/www.lovelyjubbly.co.nz/privkey.pem;

        ssl_protocols       TLSv1.3;
...
</syntaxhighlight>
=Testing=
I used https://www.http3check.net to test my site. I found it quite hard to get this to work. Key issues were the version from the instruction I ended up putting the add_header above. Apologies if lovelyjubbly is a real site.