Which connector protocol between haproxy and tomcat9

Help!
1

How does haproxy connect to tomcat9? Which protocol should I configure in the tomcat secure connector?

<Connector protocol="org.apache.coyote.http11.Http11NioProtocol" port="8443" .../>
<Connector protocol="org.apache.coyote.http11.Http11AprProtocol"
           port="8443" .../>