Скачать или смотреть Why Your Deployed Web Page on Firebase Doesn't Reflect All Changes: A Flutter Web Guide

Discover how to resolve issues with cached content after deploying updates to your Flutter web app on Firebase Hosting. Find effective strategies to ensure all users see the latest changes!
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Why Your Deployed Web Page on Firebase Doesn't Reflect All Changes

Deploying a web application is an exciting process but can lead to frustrating issues, especially when the changes you just made don’t seem to reflect across all devices. This guide will address a common problem many developers face: why certain changes in a Flutter web project deployed to Firebase Hosting are not visible, depending on the device.

Understanding the Problem

Imagine you've made a minor correction in your application, such as fixing a typo in a language translation JSON file. After going through the deployment process—updating the version number and running the necessary commands—you expect everyone to see the changes immediately. However, to your surprise, the old version of the typo still appears on some devices.

Symptoms of the Issue

Version number updates correctly but the typo persists.

Different browsers and platforms show varying versions of the content:

Android phone on Chrome: Shows an older version (2 deploys old)

iPhone on Safari: Shows a marginally older version (1 deploy old)

Mac on Chrome (using mobile view): Also shows the older version (1 deploy old)

The question arises: why does Firebase serve different versions of the webpage to different devices?

The Root Cause: Caching Issues

The underlying issue here typically involves caching. When you deploy your web app, some browsers or caching systems might still fetch older versions of your files instead of the new ones. This may lead to users experiencing inconsistencies based on their device or browser cache scenarios. Here’s how you can tackle this issue.

Solutions to Ensure Consistent Content Delivery

1. Clear Browser Cache

Browser Cache Reset: Each user can manually clear their browser cache. This could be a feasible temporary solution to ensure they load the latest content.

2. Utilize Cloudflare (or Similar Caching Solutions)

If you're using a service like Cloudflare, it can help manage your caching.

Purge Cache: Regularly purge your Cloudflare cache after every deployment to eliminate the chances of users seeing outdated content.

3. Disable Service Workers

Another method is to stop Flutter from using service workers. This will remove Progressive Web App (PWA) functionality, but may also prevent caching issues.

To disable service workers:

Access your Flutter web project files.

Locate the service worker file and comment out or remove the registration code temporarily.

4. Monitor Updates Across Devices

After making and deploying your updates, check how content appears across different browsers and devices.

Keep a log of which platforms experience issues. This information may be useful for debugging and future deployments.

5. Regularly Update Your Version Control

Always update your version number in index.html for tracking purposes. It’s beneficial for both you and your users to provide them with clear visibility on what is the current version of the application.

The Bottom Line

When deploying updates to your web app, especially if you’re using Flutter and Firebase Hosting, caching can often lead to the headache of viewing outdated content. By understanding the root cause of the issue and employing the strategies outlined above, you can ensure a smoother experience for your users across all platforms.

Stay proactive about managing caches and ensuring everyone receives the latest updates to enjoy your web application to the fullest!