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http_v3 module

http_v3 module#

Enables HTTP/3 support for client connections, as well as for connections with proxied servers configured using the following http_proxy directives:

This module is not built by default; it should be enabled with the ‑‑with‑http_v3_module configure option. The packages in our repos have this module built-in.

It’s highly recommended to build the module with an SSL library that fully supports QUIC:

Using BoringSSL:

./configure
   --with-debug
   --with-http_v3_module
   --with-cc-opt="-I../boringssl/include"
   --with-ld-opt="-L../boringssl/build/ssl
                  -L../boringssl/build/crypto"

Otherwise, the OpenSSL library will use a compatibility layer that doesn’t support (early data) and some other features, such as session reuse. The resulting build will only interoperate with clients and servers that use the same OpenSSL compatibility layer.

Example Configuration#

http {
    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;

    server {
        # for better compatibility it's recommended
        # to use the same port for http/3 and https
        listen 8443 quic reuseport;
        listen 8443 ssl;

        ssl_certificate     certs/example.com.crt;
        ssl_certificate_key certs/example.com.key;

        location / {
            # used to advertise the availability of HTTP/3
            add_header Alt-Svc 'h3=":8443"; ma=86400';
        }
    }
}

Important

Note that accepting HTTP/3 connections over TLS requires the TLSv1.3 protocol support, which is available since OpenSSL version 1.1.1.

Directives#

http3#

Syntax:

http3 on | off;

Default:

http3 on;

Context:

http, server

Enables HTTP/3 protocol negotiation.

http3_hq#

Syntax:

http3_hq on | off;

Default:

http3_hq off;

Context:

http, server

Enables HTTP/0.9 protocol negotiation used in QUIC interoperability tests.

http3_max_concurrent_streams#

Syntax:

http3_max_concurrent_streams number;

Default:

http3_max_concurrent_streams 128;

Context:

http, server

Sets the maximum number of concurrent HTTP/3 request streams in a connection.

http3_stream_buffer_size#

Syntax:

http3_stream_buffer_size size;

Default:

http3_stream_buffer_size 64k;

Context:

http, server

Sets the size of the buffer used for reading and writing of the QUIC streams.

quic_active_connection_id_limit#

Syntax:

quic_active_connection_id_limit number;

Default:

quic_active_connection_id_limit 2;

Context:

http, server

Sets the QUIC active_connection_id_limit transport parameter value. This is the maximum number of client connection IDs which can be stored on the server.

quic_bpf#

Syntax:

quic_bpf on | off;

Default:

quic_bpf off;

Context:

main

Enables routing of QUIC packets using eBPF. When enabled, this allows supporting QUIC connection migration.

Important

The directive is only supported on Linux 5.7+.

quic_gso#

Syntax:

quic_gso on | off;

Default:

quic_gso off;

Context:

http, server

Enables sending in optimized batch mode using segmentation offloading.

Important

Optimized sending is supported only on Linux featuring UDP_SEGMENT.

quic_host_key#

Syntax:

quic_host_key file;

Default:

—

Context:

http, server

Sets a file with the secret key used to encrypt stateless reset and address validation tokens. By default, a random key is generated on each reload. Tokens generated with old keys are not accepted.

quic_retry#

Syntax:

quic_retry on | off;

Default:

quic_retry off;

Context:

http, server

Enables the QUIC Address Validation feature. This includes sending a new token in a Retry packet or a NEW_TOKEN frame and validating a token received in the Initial packet.

Built-in Variables#

The http_v3 module supports the following Built-in variables:

$http3#

negotiated protocol identifier:

h3

for HTTP/3 connections

hq

for hq connections

""

an empty string otherwise

$quic_connection#

QUIC connection serial number

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