Proxy not mapping to container port.

[Jainam-17-18]

I am trying to deploy web app on (xx.xx.xx.xx) Server which has Virtual Machine.
Have add inbound rule in server firewall on port 5678 which mapped to VM's 80 port.
The kamal-proxy is running on 80 -> 80 port & 443 -> 443 port.
The application container is running on port 8080 (I guess this is container port).

applicaiton:

package main

import (
	"fmt"
	"net/http"
)

func main() {
	http.HandleFunc("/", HelloServer)
	http.ListenAndServe(":8080", nil)
}

func HelloServer(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Html for hello world")
}

Dockerfile:

#The build stage
FROM golang:1.23 as builder
WORKDIR /app
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo HelloWorld.go

#The run stage
FROM scratch
WORKDIR /app
COPY --from=builder /app/HelloWorld .
EXPOSE 8080
CMD ["./HelloWorld"]

Deploy.yml

service: my-app

image: jainam1718/learn_kamal

servers:
  web:
    - xx.xx.xx.xx

proxy:
  ssl: true
  host: subdomain.myserver.com
  app_port: 8080

registry:
  username: jainam1718

  password:
    - KAMAL_REGISTRY_PASSWORD

builder:
  arch: amd64

ssh:
  user: my-user
  port: xxxx