Retrofit with special chars at url

In my current project, I have some issues about the " and "=" symbols at URL.

http://mysampledomain.com/login?q='userlogin'="sample"

I have tried everything. "@Path" doesn't work and when I try "@Query" the characters "=" and ' " ' are changed to ASCII and It doesn't work.

http://mysampledomain.com/login?q%3D%userlogin%27=%22sample%22

How could I make this kind of requests?

Thank you!