kafka nginx 400 157 "-" "-"

I wana create docker-compose file nginx proxy for kafka
but nginx had problem 400

enter image description here
how to modify my code

192.168.0.8 is broker server
1922.168.0.16 is producer server and nginx server

1. docker-compose.yml

version: '2'
services:
  nginx:
    image: nginx:1.21.5-alpine
    ports:
      - 4000:4000
      - 443:443
    volumes:
      - ./proxy/nginx.conf:/etc/nginx/nginx.conf
    container_name: nginx-server

2. nginx.conf

user nginx;
events {
 worker_connections 1000;
}

http {

 upstream all {
  
    ip_hash;
  server 192.168.0.8:9092;
  server 192.168.0.8:9093;
  server 192.168.0.8:9094;
}
 server {
  
  server_name  192.168.0.8;

  listen 4000;
  
  location / {
     proxy_pass http://all/;
      proxy_set_header Host $host;
  }
 }
 
}

upstream all is 3 broker server

3. kafkajs config

const { Kafka } = require('kafkajs');
const { Partitioners } = require('kafkajs');

const kafkaClient = new Kafka({
  clientId: 'icas-client',
  brokers: ['192.168.0.8:4000'],
});

const producer = kafkaClient.producer({ createPartitioner: Partitioners.LegacyPartitioner });

const consumer = kafkaClient.consumer({ groupId: 'icas' });
module.exports.kafkaClient = kafkaClient;
module.exports.producer = producer;
module.exports.consumer = consumer;

Kafka uses TCP, not HTTP, so this will not work

Kafka clients already load balance, natively, so there's no reason to introduce a reverse proxy