NAME¶

https3 - configures DNS-over-HTTPS/3 (DoH3) server options.

DESCRIPTION¶

The https3 plugin allows you to configure parameters for the DNS-over-HTTPS/3 (DoH3) server to fine-tune the security posture and performance of the server. HTTPS/3 uses QUIC as the underlying transport.

This plugin can only be used once per HTTPS3 listener block.

SYNTAX¶

https3 {


    max_streams POSITIVE_INTEGER
}

•

max_streams limits the number of concurrent QUIC streams per connection. This helps prevent unbounded streams on a single connection, exhausting server resources. The default value is 256 if not specified. Set to 0 to use underlying QUIC transport default.

EXAMPLES¶

Set custom limits for maximum streams:

https3://.:443 {


    tls cert.pem key.pem


    https3 {


        max_streams 50


    }


    whoami
}

Set values to 0 for QUIC transport default, matching CoreDNS behaviour before v1.14.0:

https3://.:443 {


    tls cert.pem key.pem


    https3 {


        max_streams 0


    }


    whoami
}