Error using isFallback Server

Google Cloud Apigee
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1

Hi @dchiesa1 , Hi @kurtkanaskie

I am trying to configure a fall back server. When I receive a 500 response from Target-1 for 2 times, request should be forwarded to Target-2. Once health monitor is successfully requests should again be sent to Target-1.

Here is how I have configured Target endpoint:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<TargetEndpoint name="default">
	<Description/>
	<FaultRules/>
	<PreFlow name="PreFlow">
		<Request/>
		<Response/>
	</PreFlow>
	<PostFlow name="PostFlow">
		<Request/>
		<Response/>
	</PostFlow>
	<Flows/>
	<HTTPTargetConnection>
		<LoadBalancer>
			<Server name="Target1"/>
			<Server name="Target2">
				<IsFallback>true</IsFallback>
			</Server>
			<MaxFailures>2</MaxFailures>
			<ServerUnhealthyResponse>
				<ResponseCode>500</ResponseCode>
			</ServerUnhealthyResponse>
		</LoadBalancer>
		<Path>/</Path>
		<HealthMonitor>
		<IsEnabled>true</IsEnabled>
		<IntervalInSec>5</IntervalInSec>
		<HTTPMonitor>
		<Request>
		<Port>80</Port>
		<Verb>GET</Verb>
		<Path>/</Path>
		</Request>
		<SuccessResponse>
		<ResponseCode>200</ResponseCode>
		</SuccessResponse>
		</HTTPMonitor>
		</HealthMonitor>
	</HTTPTargetConnection>
</TargetEndpoint>

Response:
Status Code: 502

{
    "fault": {
        "faultstring": "Unexpected EOF at target",
        "detail": {
            "errorcode": "messaging.adaptors.http.flow.UnexpectedEOFAtTarget"
        }
    }
}

Can you please help?

2

Have you tried testing your target servers separately to ensure both are working?

At what point do you get the EOFAtTarget message? is this on the first request? After 2 failed requests?

3

Hi @dknezic ,

Target servers are working as expected separately.

I tried undeployed and re-deployed the proxy. For the first request to this proxy we are receiving 502.

4

In your example configuration, you had for the healthmonitor, port 80, GET /.. Is this port and path valid? What do you get for example with a curl request when using that port and path on your server?