Hi Mohan,
You indicate "set variable(defined content-type: "application/json" - 2nd time)". How are you doing that? The variable to be set that is returned to the client is message.headers.content-type. If you're doing that, you should see a response header containing application/json. If you're setting some variable only named content-type, that has no bearing to what is returned to the client.
Best Regards,
Steve Linn
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Steve Linn
Senior Consulting I/T Specialist
IBM
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