SQLSTATE[08006] [7] received invalid response to SSL negotiation: J code example

Example: psql: error: could not connect to server: received invalid response to ssl negotiation: h

# Nginx conf
events {}

stream {
  upstream postgres {
    server pdb:5432;
  }
  server {
    listen 5432;
    proxy_pass postgres;
  }
}
###############
# haproxy conf
global
  log 127.0.0.1   local1
  maxconn 4096

defaults
  mode http
  maxconn 2048

frontend postgresDB
  bind *:5000
  mode tcp
  timeout connect 5s
  timeout client 5s
  timeout server 5s
  default_backend postgresDB

backend postgresDB
  mode tcp
  server pdb pdb:5432  check inter 5s rise 2 fall 3
  
##############



############

# Containers Deployment
sudo docker run -d --name testdb 'POSTGRES_PASSWORD=123456' postgres

sudo docker run -d --name pdb  -e 'POSTGRES_USER=admin' -e 'POSTGRES_DB=testdb' -e 'POSTGRES_PASSWORD=admin123456' postgres

sudo docker run -d --name nginx-TCPreverseProxy  -p 5432:5432  --link pdb:pdb -v /home/admin/nginx.conf:/etc/nginx/nginx.conf nginx

sudo docker run -d -p 5000:5000 --name haproxy --link pdb:pdb -v /home/admin/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg haproxy

#Testing of connection
sudo docker exec -it -u 0 testdb bash

#Inside test postgres container
#checking connection through nginx-proxy
root@34211600c3f7:/#  psql -h 192.168.0.2 -p 5432 -d testdb -U admin -W

#checking connection through haproxy-proxy
root@34211600c3f7:/#  psql -h 192.168.0.2 -p 5000 -d testdb -U admin -W