Mulesoft - How to find Http error payload in exception object? - mule

Question

How to find Http error payload in exception object ?
System 1 -> Call's Mule server . Mule server -> Docusign / some one else.
Docusign / some one returns 400 error with json payload (includes errorCode etc)
I need to return the exact details back to System 1.
how will i do this?
1) I did try to add all codes in success codes 200..599, then even error is having 200 ok . This will cause more problem, because I have to add lot of choice routing as some flows are having more data conversion.
2) Ideal soln -> Raise exception as usual. This has to be caught in choice exception. Now I have to send the same status_code and the json response back to the caller.
Issue -? how can i find the payload returned by HTTP in exception object. Where is stored in exception object.

Answer 1

Here is the sample- one way of handling this kind of scenario , use validation Component to throw exception and capture in your mainflow either by exceptionHandling or by APIKIT ExceptionHandling
<flow name="routeexceptionFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/test" doc:name="HTTP"/>
<logger level="INFO" doc:name="Logger"/>
<http:request config-ref="HTTP_Request_Configuration" path="/in" method="POST" doc:name="HTTP">
<http:success-status-code-validator values="200..599"/>
</http:request>
<validation:is-false config-ref="Validation_Configuration" message="#[payload]" exceptionClass="nz.co.exception.BadRequestException" expression="#[message.inboundProperties['http.status'] ==400]" doc:name="Validate Bad Request"/>
<validation:is-false config-ref="Validation_Configuration" message="#[payload]" expression="#[message.inboundProperties['http.status'] !=200]" doc:name="Capture all other Exceptions"/>
<choice-exception-strategy doc:name="Choice Exception Strategy">
<catch-exception-strategy when="#[exception.causeMatches('nz.co.exception.BadRequestException')]" doc:name="Catch Exception Strategy">
<set-payload value="#[exception.message]" doc:name="Set Payload"/>
<logger level="INFO" doc:name="Logger"/>
</catch-exception-strategy>
<catch-exception-strategy doc:name="Catch Exception Strategy">
<logger message="****log all other exception****" level="INFO" doc:name="Logger"/>
</catch-exception-strategy>
</choice-exception-strategy>
</flow>
Add this class in your java folder
package nz.co.exception;
public class BadRequestException extends Exception {
private static final long serialVersionUID = 8546839078847602529L;
public BadRequestException() {
super();
}
public BadRequestException(String message) {
super(message);
}
public BadRequestException(Throwable t) {
super(t);
}
public BadRequestException(String message, Throwable t) {
super(message, t);
}
}
In your project if you are using APIKIT Router , then instead of using exceptionHandling as above, add directly nz.co.exception.BadRequestException in 400 ReturnCode apikitExceptionHandling.