Getting Null/Empty request body

When request coming from server1 to haproxy ,i am able to print the request body in haproxy log and traffic is also coming from haproxy to application(backend server application) but with null/empty request body.

But with same request body (payload,which is captured in haproxy log in previous case) when i am doing curl post command from server2 where haproxy is hosted,then request body is printing in the application side.
please help me!
Thanks in advance.