How to set the connection timeout value as a variable instead of a number?

[magnon-bliex]

On Apigee on-premise, I have a mission to set connection timeout value as a variable.

If I set the values of 'connect.timeout.millis' or 'io.timeout.millis' property as a number, they works fine.

But If I set the value of them as a variable instead of number, API Proxy does not work anymore.

I've searched for some logs and found that there's an error logs in message processor like below.

2021-07-19 18:22:03,709  qtp1995952705-158 ERROR REST - ExceptionMapper.toResponse() : Error occurred : Configuration failure: Caused by: java.lang.NumberFormatException: For input string: "{TimeLimit}"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Long.parseLong(Long.java:589)
        at java.lang.Long.parseLong(Long.java:631)
        at com.apigee.messaging.adaptors.http.configuration.HTTPServiceDetails.newClient(HTTPServiceDetails.java:102)
        more...

        com.apigee.entities.AbstractConfigurator.wrap(AbstractConfigurator.java:334)
        com.apigee.entities.AbstractConfigurator.add(AbstractConfigurator.java:516)
        com.apigee.messaging.runtime.TargetEndpoint.addProperties(TargetEndpoint.java:118)
        com.apigee.messaging.runtime.TargetEndpoint.handleAdd(TargetEndpoint.java:70)

        Caused by For input string: "{TimeLimit}"
        java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        java.lang.Long.parseLong(Long.java:589)
        java.lang.Long.parseLong(Long.java:631)
        com.apigee.messaging.adaptors.http.configuration.HTTPServiceDetails.newClient(HTTPServiceDetails.java:102)

And, below is my target endpoint xml:

<?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>
        <Properties>
            <Property name="connect.timeout.millis">5000</Property>
            <Property name="io.timeout.millis">5000</Property>
<!--
            <Property name="connect.timeout.millis">{TimeLimit}</Property>
            <Property name="io.timeout.millis">{TimeLimit}</Property>
-->
        </Properties>
        <URL>https://httpbin.org/</URL>
    </HTTPTargetConnection>
</TargetEndpoint>

Is there any way to set the connection timeout value as a variable instead of a number?

[Denis_KALITVI]

Note: Property values can only be literals. You cannot set values using variables.

https://docs.apigee.com/api-platform/reference/endpoint-properties-reference

[sillan_dt]

You cannot set that to any variable.

[magnon-bliex]

Thanks for the answer.

I see that variables cannot be used on property.

Can I modify "connect.timeout.millis" and "io.timeout.millis" using javascript callout?

[Denis_KALITVI]

 I think the properties part will not see vars outside of the block, so even if you will declare them, it will not affect it. You can try. 

You also can think about javascript HTTP client with your custom logic