Haproxy health check on https backend strange results

Hello !

I have the following haproxy backend configuration. I’m surprised that in haproxy status page the check is reported as “L6ok”. Why Layer 6 and not Layer 7 ?

backend back:lb    
    option httpchk GET / HTTP/1.1\r\nHost:\ www.domain.tld

    default-server ca-file my.ca inter 10s maxconn 50 maxqueue 10 ssl check

    server lb-01.{{ domain }} weight 100
    server lb-02.{{ domain }} weight 100

thank you