Ocelot Load Balance using Web Socket Issue

Hi Ocelot Team,

Please give advice for my current issue when using Load Balance configuration on Ocelot Gateway. My websocket implementation is for Microsof SignalR on my web client

## Expected Behavior / New Feature When one of server is down, not causing error and able redirect request to connect websocket to another server

Actual Behavior / Motivation for New Feature

1 Backend Server down causing Bad Gateway request and unable to a connect websocket to another backend server

Steps to Reproduce the Problem

1. Server A installed with 1 Backend service (using .net core 3.1) and Gateway (Ocelot) service
2. Server B installed with 1 Backend service
3. When All service running, client able to connect websocket using gateway
4. When Backend service is turned off on Server A and backend in server B is running, client unable to connect websocket via gateway
5. When Backend service is turned off on Server B and backend in server A is running, client unable to connect websocket via gateway
6. Http request is running fine.

Specifications

• Version: Ocelot 16.0.1
• Platform: .net Core 3.1
• Subsystem:
• Please see my config on my ocelot.json

 {
    "Routes": [
        {
            "DownstreamPathTemplate": "/OPUIAPI/api/{everything}",
            "DownstreamScheme": "http",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8001
                },
                {
                    "Host": "bthtsa1030.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/opui/api/{everything}",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        },
        {
            "DownstreamPathTemplate": "/eqstatoui/api/{everything}",
            "DownstreamScheme": "http",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/eqstat/api/{everything}",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        },
        {
            "DownstreamPathTemplate": "/eqstatoui/signalr",
            "DownstreamScheme": "ws",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/eqstat/signalr",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post",
                "Delete",
                "Options"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        },
        {
            "DownstreamPathTemplate": "/eqstatoui/signalr/{catchAll}",
            "DownstreamScheme": "ws",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/eqstat/signalr/{catchAll}",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post",
                "Delete",
                "Options"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        },
        {
            "DownstreamPathTemplate": "/OPUIAPI/signalr",
            "DownstreamScheme": "ws",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8001
                },
                {
                    "Host": "bthtsa1030.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/opui/signalr",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post",
                "Delete",
                "Options"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        },
        {
            "DownstreamPathTemplate": "/OPUIAPI/signalr/{catchAll}",
            "DownstreamScheme": "ws",
            "DownstreamHostAndPorts": [
                {
                    "Host": "bthsa1163.infineon.com",
                    "Port": 8001
                },
                {
                    "Host": "bthtsa1030.infineon.com",
                    "Port": 8000
                }
            ],
            "UpstreamPathTemplate": "/gateway/opui/signalr/{catchAll}",
            "UpstreamHttpMethod": [
                "Get",
                "Put",
                "Post",
                "Delete",
                "Options"
            ],
            "AuthenticationOptions": null,
            "FileCacheOptions": {
                "TtlSeconds": 0
            },
            "LoadBalancerOptions": {
                "Type": "LeastConnection"
            }
        }
    ],
    "GlobalConfiguration": {
        "BaseUrl": "https://localhost:5011"
    }
}