Upsource and HAProxy

Hi,

I am trying to configure traffic from upsource through haproxy but I have a problem. When I try to connect on address:

https://upsource 

I got an error:

but when I added to url:

https://upsource/hub

everything is ok, I see hub dashboard.

I'm totally new in upsource and I don't know where is a problem ?

haproxy configuration:

- service_name: upsource
    domain: upsource.FQDN
    health_check: /
    backend:
      - server_name: upsource-2
        server_ip: IP
        server_port: 8080