fix error due to breaking change in http 0.13 #26
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As you can see from below screenshot:

And further discussion on solution can be found here:
dart-lang/http#538
The breaking change of the http makes all the request originally in string, now must be Uri, if the user's Flutter is 2.0+
In this commit I was using Uri.parse to refactor all the place using http package method, changing the string to Uri.