der (oneof)</a></code></td><td><p>Access token is passed as authorization header.</p></td></tr><tr id=Tls-custom_header class=oneof><td><code>customHeader</code></td><td><code>string (oneof)</code></td><td><p>Customized header key to hold access token, e.g. x-api-key. Token will be
passed as what it is.</p></td></tr><tr id=Tls-server_name><td><code>serverName</code></td><td><code>string</code></td><td><p>Used to configure mixer TLS client to verify the hostname on the returned
certificates. It is also inclu