ClickHouse/tests/config/config.d/named_collection.xml

<clickhouse>
    <named_collections>
        <remote1>
            <host>127.0.0.2</host>
            <port>9000</port>
            <table>remote_test</table>
        </remote1>
        <remote2>
            <host>127.0.0.{1,2}</host>
            <table>remote_test</table>
        </remote2>
        <clickhouse_dictionary>
            <host>localhost</host>
            <user>default</user>
            <table>s</table>
        </clickhouse_dictionary>
        <url_with_headers>
            <headers>
                <header>
                    <name>X-ClickHouse-Format</name>
                    <value>JSONEachRow</value>
                </header>
            </headers>
        </url_with_headers>
    </named_collections>
</clickhouse>