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Discover step-by-step how to fix the `Cannot GET /` error in your React microfrontend application using Webpack configuration adjustments.
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This video is based on the question https://stackoverflow.com/q/65996926/ asked by the user 'Daniel' ( https://stackoverflow.com/u/6719819/ ) and on the answer https://stackoverflow.com/a/66035689/ provided by the user 'Daniel' ( https://stackoverflow.com/u/6719819/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Cannot GET / Error in Your React Microfrontend Using Webpack

Many developers experience a frustrating issue when working with React microfrontends configured using Webpack—the notorious Cannot GET / error. This error typically indicates that the server is not running correctly, or that the Webpack configuration is not set up properly. Let's break down how to solve this problem.

Understanding the Issue

In this specific scenario, the user notices the Cannot GET / error after their React microfrontend was previously operational. They attempted to run the application on port 8080 but found there was no service listening there. Even attempts to change the port yielded the same result, indicating that the root of the problem lies deeper in their Webpack configuration.

Initial Webpack Configuration

Here’s the initial configuration that was being used:

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

Symptoms

Error Message: Cannot GET /

Networking Verification: netstat -aon returns no listener on the specified port.

Different Environments: The issue is only present on a specific Windows machine, while it works fine on a Mac.

Solution: Adding HtmlWebpackPlugin

After examining the Webpack configuration, it became clear that one critical plugin was missing: the HtmlWebpackPlugin. This plugin is essential as it facilitates creating HTML files to serve your app and ensures that the application loads correctly.

Updated Webpack Configuration

Here’s the revised configuration that includes the HtmlWebpackPlugin:

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

Key Changes Explained

HtmlWebpackPlugin:

Make sure to import the plugin at the beginning of your configuration file.

Use the HtmlWebpackPlugin constructor to create an instance, specifying a valid template file (as seen in template: './public/index.html').

Template Path Correction:

Ensure that the path to your index.html file is correct. It is important that this template file exists, or the plugin will fail to create the HTML document necessary to serve your app.

Final Steps

After updating your Webpack configuration:

Restart the development server: Make sure to restart your Webpack dev server so that the new configurations take effect.

Check for Errors: Monitor the console output for any other potential errors during the build process.

Conclusion

By integrating the HtmlWebpackPlugin into the Webpack configuration for your React microfrontend, you can effectively resolve the Cannot GET / error. Always ensure that your development environment is correctly configured, and keep an eye out for necessary plugins that can facilitate your project's deployment and loading process. Happy coding!