laravel-echo-server don't work with proxy

I am using laravel 5.5 for api backend part of application. I am trying to set up working with web-sockets.Can you please tell me why I can not start laravel-echo-server through a proxy? Apache settings

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    RewriteEngine On
    RewriteCond %{HTTP:Upgrade} =websocket [NC]
    RewriteRule /(.*)           ws://localhost:6001/$1 [P,L]

    ProxyRequests Off
    ProxyPass        /socket.io http://localhost:6001/socket.io
    ProxyPassReverse /socket.io http://localhost:6001/socket.io

    #RewriteEngine on
    #RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
    #RewriteCond %{HTTP:CONNECTION} ^Upgrade$ [NC]
    #RewriteRule .* ws://localhost:6001%{REQUEST_URI} [P]

But if you use, not a domain, then everything works well Settings laravel-echo-server.json

{
    "authHost": "https://trarchive.it-thematic.ru",
    "authEndpoint": "/api/broadcasting/auth",
    "clients": [
            {
                    "appId": "7pTuIfhqAZMR9ZIwAAAN",
                    "key": "77c87b26b45bd770d1ede3cfe3373fd3"
            }
    ],
    "database": "redis",
    "databaseConfig": {
            "redis": {
                    "port": "6379",
                    "host": "127.0.0.1",
                    "keyPrefix": ""
            },
            "sqlite": {
                    "databasePath": "/database/laravel-echo-server.sqlite"
            }
    },
    "devMode": true,
    "host": null,
    "port": "6001",
    "protocol": "http",
    "socketio": {},
    "secureOptions": 67108864,
    "sslCertChainPath": "",
    "sslPassphrase": "",
    "subscribers": {
            "http": true,
            "redis": true
    },
    "apiOriginAllow": {
            "allowCors": false,
            "allowOrigin": "*",
            "allowMethods": "*",
            "allowHeaders": "*"
    }
}

I get error 400, Bad Request

via Chebli Mohamed