ClickHouse/tests/integration/test_http_handlers_config/test_dynamic_handler/config.xml

<?xml version="1.0"?>

<yandex>
    <http_handlers>
        <rule>
            <headers><XXX>xxx</XXX></headers>
            <methods>GET</methods>
            <url>/test_dynamic_handler_get</url>
            <handler>
                <type>dynamic_query_handler</type>
                <query_param_name>get_dynamic_handler_query</query_param_name>
            </handler>
        </rule>
    </http_handlers>
</yandex>