Web socket in http mode

Help!
1

I’m trying to set up proxy in http mode using haproxy. The problem with tcp is that I need to read headers. So what I’m doing wrong? I was tried so many times with different configurations, but it just no working. (Nginx in that case works ok)

p.s. is reverse-proxied servers which available by subdomain

So I would be glad to get any advices with that problem

global
    log stdout format raw daemon debug

defaults
    log global
    option dontlognull
    timeout connect 5s
    timeout client  30s
    timeout server  30s

frontend ws_front
    bind *:8000
    mode http

    http-request set-var(req.cleaned_host) hdr(host)

    http-request set-var(req.cleaned_host) var(req.cleaned_host),regsub(^.*://,)

    http-request set-var(req.cleaned_host) var(req.cleaned_host),regsub(:.*$,)

    http-request set-var(txn.backend_host) var(req.cleaned_host),map(/etc/haproxy/servers_map.txt)

    acl is_proxy1 var(txn.backend_host) -m dom proxy1
    acl is_proxy2 var(txn.backend_host) -m dom old

    acl is_websocket hdr(Upgrade) -I WebSocket
    acl is_websocket hdr_beg(Host) -I ws

    use_backend nginx_ws_proxy if is_proxy1
    use_backend nginx_ws_old if is_proxy2

backend nginx_ws_proxy
    mode http
    http-request set-header Host <subdomain><domain>
    option forwardfor # This sets X-Forwarded-For
    timeout queue 5000
    timeout server 5000
    timeout connect 5000

    server nginx_srv <ip1>:8000 ssl verify none

backend nginx_ws_old
    mode http
    
    server nginx_srv <ip2>:8002 ssl verify none