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Ahmad Darwesh
Ahmad Darwesh

Posted on • Updated on

Flutter - securing http requests

In today's digital era, web security is of utmost importance. One of the most common attacks on web applications is the Cross-Site Request Forgery (CSRF) attack. This attack occurs when an attacker tricks the user's browser into sending a request to a web application without their knowledge or consent. To prevent CSRF attacks, it is essential to secure HTTP requests.

Flutter is a popular mobile app development framework that allows developers to build high-performance, cross-platform apps. It provides a rich set of tools and features to secure HTTP requests, including CSRF protection.

To secure HTTP requests in Flutter, developers can use the csrf package, which provides middleware to prevent CSRF attacks. The package generates a unique token for each user session and adds it to the HTTP request header. The server then verifies the token before processing the request.

To use the csrf package in Flutter, follow these steps:

Add the csrf package to your project dependencies in the pubspec.yaml file:

  csrf: ^1.0.0
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Import the package in your code:

import 'package:csrf/csrf.dart';
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Add the middleware to your HTTP requests:

final csrfToken = await getCsrfToken(); // Get the CSRF token
final response = await
  headers: {'X-CSRF-Token': csrfToken}, // Add the token to the HTTP request header
   body: {...},
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On the server side, verify the token before processing the request:

function verifyCsrfToken(req, res, next) {
  const csrfToken = req.headers['x-csrf-token'];
  if (!csrfToken || csrfToken !== req.session.csrfToken) {
    return res.sendStatus(403);
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In the example above, the server verifies the token by comparing it to the token stored in the user's session. The server sends a 403 Forbidden response if the tokens do not match.

In conclusion, securing HTTP requests with CSRF protection is essential to prevent attacks on web applications. Flutter provides robust tools and features to secure HTTP requests, including the csrf package. By implementing these security measures, developers can ensure that their mobile apps are protected from CSRF attacks and provide a secure user experience.

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