Query parameters escaping

Hello!

I have nginx working as a reverse proxy and forwarding requests that from time to time contains unsafe characters like '{' or '}' in
query parameters. And browser doesn't escape them. If I will use those characters in path/url - they will be escaped. But, if
they used in query part - they sent as is. And nginx forwards them as is.

But issue that netty server, serving those requests, doesn't allow to have such symbols in request url. And I've got error message.

Could you tell, how to escape those symbols before passing request forward?

Thank you!