Flutter Error: The argument type ‘String’ can’t be assigned to the parameter type ‘Uri’

The Error

If you are using a string URI when dealing with the http package in Flutter, you may be seeing this error:

The argument type 'String' can't be assigned to the parameter type 'Uri' at .... (argument_type_not_assignable)

This error is due to an update in the package.

The Solution

Parse the String to be an explicit URI by using the Uri.parse() method:

http.get(yourString) becomes http.get(Uri.parse(yourString))

http.post(yourString) becomes http.post(Uri.parse(yourString))

Here is it in an example:

String dataURL = "https://api.com/users";
http.Response response = await http.get(Uri.parse(dataURL));

To improve compile-time type safety, the http package (version 0.13.0) introduced changes that made all functions that previously accepted Uris or Strings now accept only Uris instead.

You will need to explicitly use Uri.parse to convert Strings to Uris. In the previous version, the http packaged called that for you behind the scenes.