http package in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the http package in Flutter?

The http package allows Flutter apps to send and receive data over the internet using HTTP requests like GET and POST.

beginner

How do you add the http package to a Flutter project?

Add http: ^0.13.6 (or latest version) under dependencies in pubspec.yaml and run flutter pub get.

beginner

What Flutter code snippet sends a simple GET request using the http package?

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

void fetchData() async {
  var response = await http.get(Uri.parse('https://example.com'));
  if (response.statusCode == 200) {
    print(response.body);
  }
}

beginner

What does the Uri.parse() method do in the context of the http package?

It converts a string URL into a Uri object, which is required by the http methods to specify the web address.

intermediate

How can you send data with a POST request using the http package?

Use http.post() with the body parameter containing data as a map or encoded string, for example: await http.post(Uri.parse('https://example.com'), body: {'key': 'value'});

Which method from the http package is used to fetch data from a web server?

A http.post()

B http.get()

C http.put()

D http.delete()

http.get() is used to request data from a server, typically to read or fetch information.

What type of object must you pass to http.get() as the URL parameter?

A Uri

B String

C int

D List

The http package requires a Uri object, which you create using Uri.parse() from a string URL.

How do you check if an HTTP request was successful in Flutter using the http package?

A Check if <code>response.statusCode == 404</code>

B Check if <code>response.body != null</code>

C Check if <code>response.headers</code> is empty

D Check if <code>response.statusCode == 200</code>

A status code of 200 means the request succeeded and the server returned the expected data.

Which import statement is correct to use the http package with an alias?

A import 'package:flutter/http.dart';

B import 'http.dart';

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

D import 'http';

This is the standard way to import the http package and use the alias http for its methods.

What is the main difference between http.get() and http.post()?

A <code>get()</code> retrieves data; <code>post()</code> sends data to the server

B <code>get()</code> sends data; <code>post()</code> retrieves data

C Both do the same thing

D <code>post()</code> deletes data; <code>get()</code> updates data

get() is for fetching data, while post() is for sending data to the server, like submitting a form.

Explain how to perform a GET request using the Flutter http package and handle the response.

Think about the steps from importing the package to printing the data.

Describe how to send data to a server using a POST request with the Flutter http package.

Focus on how you include data in the request.