Request Payload getting empty while executing POST servlet on AEM Cloud Service Publish Instance

We are facing issue on AEM as Cloud Service Publish instance where request payload is empty when triggered path based POST servlet. Request is reaching servlet as enabled in dispatcher but in servlet logs we are seeing headers as 

Content-Type as null, Content-Length as 0 and No request payload found which is causing servlet to fail.

On Author the servlet is working fine.

Any suggestions in this regard will be helpful