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wso2wso2-api-managerwso2-enterprise-integrator

Payload becomes empty whenever it reaches the backend Wso2

This is the code generated in Integration Studio. I'm hitting an API through my production endpoint. I'm converting the payload from XML to JSON, and I can see the payload successfully converted in the logs. However, whenever it reaches the backend, it becomes null.

<?xml version="1.0" encoding="UTF-8"?>
<api context="/props" name="props_api" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="POST">
        <inSequence>
            <payloadFactory media-type="json" template-type="freemarker">
                <format>{
    "name": "${payload.root.user.name}",
    "description": "${payload.root.user.description}"
}</format>      
                <args>
                    <arg evaluator="xml" expression="//root/user/name"/>
                    <arg evaluator="xml" expression="//root/user/description"/>
                </args>
            </payloadFactory>
            <header name="Content-Type" scope="transport" value="application/json"/>
            
            <log level="full"/>
            <send>
                <endpoint>
                    <address uri="http://127.0.0.1:8000/drinks/">
                        <suspendOnFailure>
                            <initialDuration>-1</initialDuration>
                            <progressionFactor>-1</progressionFactor>
                            <maximumDuration>0</maximumDuration>
                        </suspendOnFailure>
                        <markForSuspension>
                            <retriesBeforeSuspension>0</retriesBeforeSuspension>
                        </markForSuspension>
                    </address>
                </endpoint>
            </send>
        </inSequence>
        <outSequence>
            <send/>
        </outSequence>
        <faultSequence/>
    </resource>
</api>

Here's the payload:

<root>
    <user>
        <name>s</name>
        <description>dd</description>
    </user>
</root>

The payload is successfully converted from XML to JSON, as seen in the logs:

{
    "name": "s",
    "description": "dd"
}

However, whenever it reaches the backend, it becomes null. Here's the error log:

[2023-02-26 18:13:21,282]  INFO {LogMediator} - {api:props_api} To: /props, MessageID: urn:uuid:e5b8eb0f-85d0-4150-a284-1292b6c902be, correlation_id: e5b8eb0f-85d0-4150-a284-1292b6c902be, Direction: request, Payload: {
    "name": "s",
    "description":"dd"
}
[2023-02-26 18:13:21,282]  INFO {LogMediator} - {api:props_api} To: /props, MessageID: urn:uuid:e5b8eb0f-85d0-4150-a284-1292b6c902be, correlation_id: e5b8eb0f-85d0-4150-a284-1292b6c902be, Direction: request, Payload: {
    "name": "s",
    "description": "dd"
}
[2023-02-26 18:13:21,306] ERROR {TargetHandler} - HTTP protocol violation : Not a valid protocol version: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" For : 127.0.0.1:8000 org.apache.http.ProtocolException: Not
Solution

  • Try using an HTTP Endpoint rather than an address endpoint.

    <endpoint>
  <http method="post" uri-template="http://127.0.0.1:8000/drinks">
      <suspendOnFailure>
          <initialDuration>-1</initialDuration>
          <progressionFactor>1.0</progressionFactor>
      </suspendOnFailure>
      <markForSuspension>
          <retriesBeforeSuspension>0</retriesBeforeSuspension>
      </markForSuspension>
  </http>
</endpoint>

    If that doesn't work, enable the Wirelogs as Sanoj mentioned and share the logs.