About query strings in urls

[Surajeet Das]

I am actually developing an android app which will fetch data using an api .  I am trying to pass multiple parameters in the url using query strings, but I am not able concatenate those parameters in the url. 

eg: U/userapi/?email=abc&pass=bcd

I trying to achieve the above example.

How do I take email and password parameter together in the url ?

Help me out on that.