upstream phoenix_backend {
    hash $http_sec_websocket_key consistent;
    
    server phoenix1:4000 max_fails=1 fail_timeout=10s;
    server phoenix2:4000 max_fails=1 fail_timeout=10s;
    server phoenix3:4000 max_fails=1 fail_timeout=10s;
}

server {
    listen 80;
    server_name localhost;

    location /socket {
        proxy_pass http://phoenix_backend;
        proxy_http_version 1.1;
        
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        
        proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
        proxy_next_upstream_tries 1;
        proxy_connect_timeout 1s;
    
    }

    location /api { 
        proxy_pass http://phoenix_backend;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        
        proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
        proxy_next_upstream_tries 3;
        proxy_connect_timeout 5s;
        proxy_read_timeout 30s;
    }

    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
}