Why we are getting Body in Get or Head Request

That's not very clear... Where are you seeing this blocked? What's generating the request and what is generating the response? There's very few mind-readers or magicians online so you'll have to do a bit of legwork to explain what's happening in your scenario.

But... To try & be helpful. What you are seeing is a server complaining that a request (GET) is being sent with body data included. The HTTP protocol doesn't explicitly forbid that. But it makes no sense to include a body and should be ignored. However it looks like whoever wrote the server you're talking to had other ideas and thought they'd be extra strict.

There's a discussion on stack overflow about this sort of scenario BODY with GET. As with most things where there's ambiguity in the spec there's a bit of an argument over who's right and wrong, but the main thing you should take from this is that there's a disagreement on how the protocol should work at each end and one of them has to give way for things to work properly.

Now, why are you getting a body in the GET? You'd have to ask whoever wrote your client. have you tcpdump'ed the request to verify that there really is a body? And you don't have something in the middle adding it? Like all debugging, it's about what you can prove.