Solving the statusCode Issue in Flutter-Django OTP Verification Flow

Learn how to resolve the `statusCode` check issue in your Flutter app when working with a Django backend for OTP verification. Follow our step-by-step guide for a smoother implementation!
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Solving the statusCode Issue in Flutter-Django OTP Verification Flow

When working with mobile applications that require user verification, implementing an OTP (One Time Password) feature is a common requirement. However, developers sometimes face challenges when it comes to checking the response status of API calls.

In this guide, we will explore a specific issue: the statusCode was returning 200 from the Django server, yet the Flutter application was still showing an error notification instead of navigating to the home screen. We will provide a detailed solution by properly managing asynchronous calls in Dart and Flutter.

The Problem

In the scenario presented, a developer has created an OTP verification feature in their Flutter app which communicates with a Django server. After the server responds with a statusCode of 200, the app still prompts a Snackbar with an error message. The confusion arises because the application logic is incorrectly checking the value of statusCode immediately after making an API call—which may not reflect the latest value due to asynchronous behavior.

Key Sections of the Code

The problematic code resides in the button's onPressed method, where the OTP is sent and a check is made against the status code right after. Here's the pertinent part for reference:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To effectively resolve this issue, you need to ensure that the application waits for the API response before proceeding with checks. This is where async and await keywords come in handy. By marking the onPressed method as async, we can wait for sendOTP to complete before assessing the status code.

Step-by-Step Code Update

Modify the onPressed function to be asynchronous.

Callback await the sendOTP function to ensure it completes before continuing with the logic of checking the statusCode.

Here’s how to properly structure that code:

[[See Video to Reveal this Text or Code Snippet]]

Code Explanation

async: This keyword allows the method to be asynchronous, letting the app know that it will be waiting for a future result.

await: Using await before the sendOTP function ensures that the app will wait until the API call completes, giving you the correct statusCode afterward.

Conclusion

Managing asynchronous operations is crucial in building responsive Flutter applications, especially when integrating with backend services like Django. By employing async and await, you can effectively address timing issues and ensure that your app behaves as expected.

Now that you understand how to fix the statusCode mishap in your Flutter app, it's time to put this knowledge into practice and improve the user experience of your application.

Make sure to test this new implementation and observe how your application responds correctly upon entering and verifying the OTP!