API call

Send a request to the weather API with http.get.

Request with http.get

To fetch weather data from an API you use the get function from the http package. It returns a Future<Response>; you await it and reach the JSON string via response.body.

import 'package:http/http.dart' as http;

Future<String> havaGetir() async {
  final uri = Uri.parse('https://api.example.com/hava/istanbul');
  final response = await http.get(uri);
  return response.body;
}

URL with Uri.parse

http.get expects a Uri; you turn a plain string into a Uri with Uri.parse. Properly formatting the URL makes requests succeed.

final uri = Uri.parse('https://api.example.com/hava/ankara');
final response = await http.get(uri);
print(response.statusCode);  // 200

Exercise The havaDurumuGetir function

Write an async function named havaDurumuGetir. Convert the URL to a Uri with Uri.parse, send a request with http.get, and return response.body. In main, parse the URL with Uri.parse and print it.

Show example solution

import 'package:http/http.dart' as http;

Future<String> havaDurumuGetir() async {
  final uri = Uri.parse('https://api.example.com/hava/istanbul');
  final response = await http.get(uri);
  return response.body;
}

void main() {
  final uri = Uri.parse('https://api.example.com/hava/istanbul');
  print(uri);
}

Test yourself

What does the http.get call return?
- Future<Response>
- Widget
- void
- String
Show answer

Future<Response> — http.get returns a Future<Response>; after await you get the Response object. void has no return value, String is not direct (accessed via response.body), and Widget is for UI.

The http.get call

import 'package:http/http.dart' as http;

Future<String> getir() async {
  final uri = Uri.parse('https://api.example.com/hava/izmir');
  final response = await ____;
  return response.body;
}

Show answer

import 'package:http/http.dart' as http;

Future<String> getir() async {
  final uri = Uri.parse('https://api.example.com/hava/izmir');
  final response = await http.get(uri);
  return response.body;
}

http package parts

http.get

Sends a request to the API
Uri.parse

Converts a string to a Uri
response.body

Response body
await

Waits for a Future

Next lesson: JSON handling

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