why my extract variable policy not failing even with IgnoreUnresolvedVariables "false"?

Google Cloud Apigee
1

Below is my policy example, please let me why no fault has been raised if referenced xpath is invalid.

<ExtractVariables name="Extract-Variable-Submit-Request">
  <IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
  <URIPath>
    <PatternignoreCase="true">/sendEmail/{BusinessProcessId}</Pattern>
  </URIPath>
  <XMLPayload stopPayloadProcessing="false">
    <Namespaces/>
    <Variablename="Item" type="nodeset">
    <XPath>/Data/Item</XPath>
    </Variable>
  </XMLPayload>
  <Source clearPayload="true">request</Source>
</ExtractVariables>
2

When no XPath is satisfied within the ExtractVariables policy , the policy does not cause a fault.

The way to handle this case is with a condition in the flow, after the policy, testing the extracted variable.

 ...
<Step>
  <Name>Extract-Variable-Submit-Request</Name>
</Step>
<Step>
  <Condition>Item = null</Condition>
  <Name>RaiseFault-InvalidXml</Name>
</Step>
 ...
3

Thank you Dino…

Extract policy causing the fault with json payload which i am using in another proxy ( expected

behaviour ) policy xml as below. The same behaviour i expected in XML payload as well.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ExtractVariables async="false" continueOnError="false" enabled="true" name="Extract-Inputs">
    <DisplayName>Extract Input Data</DisplayName>
    <Properties/>
    <IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
    <JSONPayload>
        <Variable name="AddressLine1">
            <JSONPath>$.AddressLine1</JSONPath>
        </Variable>
        <Variable name="AddressLine2">
            <JSONPath>$.AddressLine2</JSONPath>
        </Variable>
        <Variable name="City">
            <JSONPath>$.City</JSONPath>
        </Variable>
        <Variable name="State">
            <JSONPath>$.State</JSONPath>
        </Variable>
        <Variable name="Zip5">
            <JSONPath>$.Zip5</JSONPath>
        </Variable>
    </JSONPayload>
    <Source clearPayload="false">request</Source>
</ExtractVariables>

Fault Response

{
    "errorResponse": {
        "code": "500",
        "message": "Invalid JSON path $.City in policy Extract-Inputs.",
        "info": "/gkcv-bosdp-ecpdid/v1/openapi.json",
        "x-bos-api-tx-id": "12:19_3:45-fldldfetvw004-8338-1122350-1_recorded"
    }
}