Reverse proxy setup with haproxy

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Hi All,

I am using haproxy to route the traffic. I added a custom domain on website with name webflow.example.com and route its content to my main domain example.com using haproxy.

Now example.com can server content on / from webflow.example.com. Now i want when i hit example.com/admin it should server data from other backend mentioned in haproxy.

But it is giving me 503 service unavailable for example.com/admin

Here is my haproxy config file

   acl is_admin path_beg /admin
    use_backend admin_backend if is_admin
    default_backend publicwebflow

backend publicwebflow
    http-request set-header Host webflow.example.com
    server webflow webflow.example.com:443 ssl verify none sni str(webflow.example.com) ssl-min-ver TLSv1.2

backend admin_backend
    http-request set-header Host example.com
    server admin 10.1.0.12:8625 ssl verify none ssl-min-ver TLSv1.2