How to read the hostname of a Target Server in JS

[asaischintala]

I have configured a Target Server in my env.

However, I have  a  need to read the hostname configured for the target server in a JS.

I tried the below in Target Preflow, but is coming as empty

var tarHost=context.getVariable('target.host');

I've also configured the HTTPConnection node on target flow.

<HTTPTargetConnection>
        <LoadBalancer>
            <Server name="Backend1"/>
        </LoadBalancer>
        <Path>/api</Path>
</HTTPTargetConnection>

The routing seems to work as expected though.

Can you please let me know how to read the hostname of a specific Target Server in JS.
TIA.

@dchiesa1please advise.

[davidwallen]

The variable is not yet populated when you are in the Proxy Preflow. "target.host" would only be populated in a TargetEndpoint flow. 

[API-Evangelist]

Try moving to target response flow to make it work. Refer below --

The domain name of the target service returning the response to the API proxy.

https://docs.apigee.com/api-platform/reference/variables-reference#target

[asaischintala]

@API-Evangelist 
Looks like target.host is available only in Target Response Flow

[API-Evangelist · Accepted solution]

Why not use kvm approach and based of current flow name you are well aware  of the target ahead

Examples for a sample condition flow as shown below , in KVM you define the host

key as sample

value as https://learningapigee.com

<Condition>(proxy.pathsuffix MatchesPath "/sample") and (request.verb = "POST")</Condition>

In the flow you get the kvm as below

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<KeyValueMapOperations async="false" continueOnError="false" enabled="true" name="KV-Test" mapIdentifier="KVM_Test">
<DisplayName>KV-Test</DisplayName>
<ExpiryTimeInSecs>120</ExpiryTimeInSecs>
<Get assignTo="targetUrl">
<Key>
<Parameter ref="current.flow.name"/>
</Key>
</Get>
<Scope>environment</Scope>
</KeyValueMapOperations>

Now you are aware of the target information ahead & can work on the logic

Finally you can assign the target as below instead of your current approach

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<AssignMessage async="false" continueOnError="false" enabled="true" name="AM-TargetUrl">
<DisplayName>AM-TargetUrl</DisplayName>
<Properties/>
<AssignVariable>
<Name>target.url</Name>
<Template>{targetUrl}?{request.querystring}</Template>
</AssignVariable>
<IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
<AssignTo createNew="false" transport="http" type="request"/>
</AssignMessage>