Hi Mohanraj-san,
It seems your response doesn't have Content-Type properly, so please try to set 'Content-Type: application/json' to [Http Headers] and set true to [Include HTTP Headers In Response].
This is my sample setting.


Response file is
Server: Apache-Coyote/1.1
Cache-Control: no-cache
Pragma: no-cache
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Set-Cookie: JSESSIONID=C9F814374CF1E76209A4C311F6479436; Path=/datamanagement/; HttpOnly
Set-Cookie: Session-ID=C9F814374CF1E76209A4C311F6479436; Path=/
Set-Cookie: Accept-Language=en; Path=/
Set-Cookie: Accept-Language-ISO=en; Path=/
Content-Type: application/json
Transfer-Encoding: chunked
Date: Tue, 12 Sep 2017 01:09:50 GMT
{"id":"4","result":true,"description":"100% Succeeded","stage":"Post-Deployment","stageState":"Succeeded","releaseStatus":"Succeeded"}
I hope my sample helps you.
Cheers
Yas