Issue with getting to HTTP/3 or QUIC on first connect

Eric Germann ekgermann at semperen.com
Thu Mar 9 06:56:50 UTC 2023


I’m having an issue where I (think I) have enabled HTTP3 correctly on my nginx server.  When I connect to the server the first time, it indicates HTTP/2 in the logs.  If I hit refresh it indicates HTTP/3 from then on.  So something is wrong with the configuration of the server to offer headers to negotiate it.  I’ve even added HTTPS DNS records to indicate the preferred connection schemes.  Bonus points if you can help me get QUIC working too.

The result of http3check.net <http://http3check.net/> is "HTTP/3 Check could not get the server's advertised QUIC versions due to the error given below.
Bad status code from server.
Thanks in advance for any pointers

Eric

Source code was pulled 2023-02-27


Build information is:

nginx version: nginx/1.23.4
built by gcc 7.3.1 20180712 (Red Hat 7.3.1-15) (GCC)
built with OpenSSL 3.0.8+quic 7 Feb 2023
TLS SNI support enabled
configure arguments: --with-threads --with-cc-opt='-static -static-libgcc' --with-ld-opt=-static --with-debug --with-compat --with-file-aio --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-stream_realip_module --with-http_realip_module --with-http_secure_link_module --with-http_random_index_module --with-http_geoip_module --with-http_ssl_module --with-http_v2_module --with-http_v3_module --with-stream_quic_module --with-http_sub_module --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module --with-cc-opt=-I/usr/local/include --with-ld-opt=-L/usr/local/lib --with-openssl=../quictls --with-openssl-opt=enable-tls1_3 --add-module=/source/ngx_brotli


Pertinent config for the server block is

    upstream httpd_backend {
        server 172.28.10.91:443;

        keepalive 120;
    }

    log_format quic '$remote_addr - $remote_user [$time_local] '
                        '"$request" $status $body_bytes_sent '
                        '"$http_referer" "$http_user_agent" "$http3"';

    access_log logs/access.log quic;

    # NON-SSL
    server {
        listen                  80;
        listen                  [::]:80;
        server_name             www.example.com;

        location / {
          rewrite               ^ https://www.example.com$request_uri?/ permanent;
        }
    }

    # SSL
    server {
        listen                  443             ssl http2;
        listen                  [::]:443        ssl http2;
        listen                  443             http3 reuseport;
        listen                  [::]:443        http3 reuseport;

        quic_retry              on;

        server_name             noc2.semperen.com;

        # Set up your cert paths
        ssl_certificate_key             /etc/letsencrypt/live/www.example.com/privkey.pem;
        ssl_certificate                 /etc/letsencrypt/live/www.example.com/fullchain.pem;
        ssl_trusted_certificate         /etc/letsencrypt/live/www.example.com/chain.pem;
        ssl_dhparam                     SSLKeys/dhparam.pem;
        ssl_protocols                   TLSv1.3;
        ssl_prefer_server_ciphers       On;
        ssl_ciphers                     TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-256-GCM-SHA384:AES256+EECDH:AES256+EDH:!aNULL:!CBC;
        ssl_ecdh_curve                  secp384r1;
        ssl_early_data                  on;

        # enable ocsp stapling
        ssl_stapling on;
        ssl_stapling_verify on;

        resolver 8.8.4.4 8.8.8.8 valid=86400s;
        resolver_timeout 10s;

        # upgrade to HTTP3 and HTTP2
        add_header alt-svc              'h3=":443"; ma=86400, h2=":443"; ma=86400';
        add_header alt-svc              'h2=":443"; ma=86400; persist=1';
        add_header alt-svc              'h2=":443"; ma=86400;';

        add_header X-Frame-Options      "SAMEORIGIN";


        # tell users to go to SSL version next time
        add_header Strict-Transport-Security "max-age=31104000; includeSubdomains" always;

        # handle brotli compression
        brotli                          on;
        brotli_static                   on;

	# Note this is one line, even if it wraps and renders as two
        brotli_types                    text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

        brotli_buffers                  16 8k;
        brotli_comp_level               9;

        client_max_body_size            32M;

        error_page 502 /custom_502.html;
        location = /custom_502.html {
            root /usr/local/nginx/html;
            internal;
        }

        location / {
            proxy_pass                  https://httpd_backend;
            proxy_http_version          1.1;
            proxy_buffering             on;
            proxy_set_header            X-Forwarded-For $remote_addr;
            proxy_set_header            X-Real-IP       $remote_addr;
            proxy_set_header            Host            $host;
            proxy_pass_header           Authorization;
#           proxy_set_header            X-Scheme        $scheme;
#           proxy_set_header            Upgrade         $http_upgrade;
#           proxy_set_header            Connection      "upgrade";
        }

        location /roundcube {
            proxy_pass                  https://172.28.10.100;
            proxy_http_version          1.1;
            proxy_buffering             on;
            proxy_set_header            X-Forwarded-For $remote_addr;
            proxy_set_header            X-Real-IP       $remote_addr;
            proxy_set_header            Host            $host;
            proxy_pass_header           Authorization;
#           proxy_set_header            X-Scheme        $scheme;
#           proxy_set_header            Upgrade         $http_upgrade;
#           proxy_set_header            Connection      "upgrade";
        }
    }




--
Eric Germann
ekgermann {at} semperen {dot} com || ekgermann {at} gmail {dot} com
LinkedIn: https://www.linkedin.com/in/ericgermann
Medium: https://ekgermann.medium.com <https://ekgermann.medium.com/>
Twitter: @ekgermann
Telegram || Signal || Skype || WhatsApp || Phone +1 {dash} 419 {dash} 513 {dash} 0712

GPG Fingerprint: 89ED 36B3 515A 211B 6390  60A9 E30D 9B9B 3EBF F1A1







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