Request all things about a specified channel

I`m following a video tutorial using

package:http/http.dart

package and it requires an URL witch I want to parse.
Im new at this so the question might be obvious.
I tried reading the documentation before.
I`m trying:

https://api.twitch.tv/kraken/streams/?user_login=easywithaces&client_id=MY_ID
Want to get this data from user “easywithaces”.
Parse the title(status) and look for keywords in it.
I just can`t get the request url right.