Скачать или смотреть Resolving ERR_CONNECTION_REFUSED in Angular Apps Using Module Federation

Discover how to load two different Angular apps side by side using `Module Federation` and fix the `ERR_CONNECTION_REFUSED` error effectively.
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Resolving ERR_CONNECTION_REFUSED in Angular Apps Using Module Federation

In today's world of web applications, the concept of micro-frontends has gained traction as developers seek to create dynamic, scalable applications. One powerful tool at our disposal for achieving this in Angular applications is Module Federation, a feature in Webpack 5. This allows different apps to be integrated and loaded seamlessly. However, developers often encounter challenges, such as the infamous ERR_CONNECTION_REFUSED error when trying to load remote applications. Let’s dive into the problem and its solution.

The Problem

Imagine you have two Angular applications: a Product View and a Product Cart, along with a shell application that integrates both using Module Federation. Each app is hosted on different ports, and you've managed to configure your angular routing correctly.

However, the trouble arises when one of your remote applications terminates or is unreachable. For instance, if the Product Cart app hosted on port 7000 goes down, you might encounter the error:

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

This results in an inability to load the related routes in the shell application, impacting the user experience.

The Solution

To prevent this error from halting your application, we can implement a graceful error handling strategy. Here’s how:

Step 1: Enhancing Your Route Configuration

The key is to modify the route loading to include a fallback mechanism for failed remote application loads. Below is the adjusted code that introduces a placeholder error module:

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

Step 2: Implementing the Error Module

Create a Placeholder Module:
This module will serve as a replacement whenever there is an issue loading the desired remote module.

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

Design the Error Component:
Provide feedback to your users about the error and offer potential actions, such as retrying the connection or checking their internet connection.

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

Step 3: Applying Changes Across Your Shell App

Make sure to apply similar error handling for all your remote modules in the shell application, ensuring that if any other app fails to load, users will see a friendly error message rather than a crashing application.

Conclusion

By implementing a fallback to an error module when remote applications fail to load, you've taken a significant step toward enhancing the resilience of your application. This approach not only improves user experience but also adheres to best practices in web development, allowing for a modular and error-tolerant architecture.

In summary, using Module Federation in Angular allows for flexible and dynamic applications. With these changes, you can now confidently integrate multiple remote applications and ensure smooth user interactions even in the face of errors.

For more insights, remember to check updates on Angular and Webpack as the community is continuously evolving these technologies.