Proxy SignalR -- document how

Using Yarp proxy SignalR, I frequently encounter connection failures, about 10 requests out of 3 failed, but ocelot did not encounter this situation

Below is my routing configuration

{
    "Routes": {
        "SignalRRoute": {
            "ClusterId": "SignalRCluster",
            "CorsPolicy": "CorsPolicy",
            "AuthorizationPolicy": "JwtPolicy",
            "Match": {
                "Path": "/BaizeHub/{*any}"
            },
            "Transforms": [
                {
                    "PathRemovePrefix": "/BaizeHub"
                },
                {
                    "RequestHeadersCopy": "true"
                },
                {
                    "RequestHeaderOriginalHost": "true"
                },
                {
                    "RequestHeader": "Upgrade",
                    "Set": "WebSocket"
                },
                {
                    "RequestHeader": "Connection",
                    "Set": "Upgrade"
                },
                {
                    "X-Forwarded": "Set",
                    "For": "Append",
                    "Proto": "Append",
                    "Prefix": "Append",
                    "HeaderPrefix": "X-Forwarded-"
                }
            ]
        }
    },
    "Clusters": {
        "SignalRCluster": {
            "LoadBalancingPolicy": "PowerOfTwoChoices",
            "Destinations": {
                "Message/Destination1": {
                    "Address": "https://172.30.50.13:5400"
                },
                "Message/Destination2": {
                    "Address": "https://172.30.50.12:5400"
                }
            },
            "HttpClient": {
                "DangerousAcceptAnyServerCertificate": true
            },
            "HttpRequest": {
                "Version": "1.1",
                "Timeout": "00:10:00"
            },
            "HealthCheck": {
                "Active": {
                    "Enabled": "true",
                    "Interval": "00:00:10",
                    "Timeout": "00:00:10",
                    "Policy": "ConsecutiveFailures",
                    "Path": "/Health"
                },
                "Passive": {
                    "Enabled": true,
                    "Policy": "TransportFailureRate",
                    "ReactivationPeriod": "00:00:10"
                }
            }
        }
    }
}

• Yarp.ReverseProxy 1.0.0-preview.12.21328.2
• Linux