HAProxy returns 404 sometimes even though the backend server is running

I am getting infrequent 404 errors even though the backend servers are running. I even tried to set only one backend server, and the result is the same.

backend keycloak_servers
timeout connect 10s
timeout server 120s
mode http
balance roundrobin
#cookie SERVER insert indirect nocache
#http-request set-header X-Forwarded-Proto https if { ssl_fc }
http-request set-header X-Forwarded-Host %[req.hdr(Host)]

http-check expect status 200  
	http-check send meth GET uri /Keycloak
    server micro1 myip1:8443 ssl verify none check inter 5s fall 3 rise 2
    server micro2 myip2:8443 ssl verify none check inter 5s fall 3 rise 2

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