Скачать или смотреть Resolving the Firebase Functions Issue with a Custom Domain

Learn how to fix issues with accessing Firebase Functions through a custom domain when using Firebase Hosting.
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Resolving the Firebase Functions Issue with a Custom Domain

When setting up your web applications, making both your Firebase hosting and Firebase functions accessible through the same domain can be quite challenging. Many developers encounter difficulties when their Firebase functions don't work as expected with a custom domain. In this guide, we'll walk through a typical problem faced by developers and provide a step-by-step solution that will help you streamline your Firebase setup.

The Problem: Functions Not Triggering

Imagine you’ve configured your Firebase hosting and functions aiming for a clean setup where both services are accessible through a single custom domain. For example, your hosting domain might look like this:

Hosting: https://xxxxxxxxx-dev.web.app/

Functions: https://xxxxxxxxx-dev.web.app/app

However, when you try to access your Firebase function via the specified endpoint, you may encounter an HTTP response that is not what you expect. You may see an HTML file stating:
"You need to enable JavaScript to run this app."

Upon checking your logs, curious developers might find that their Firebase function isn’t being triggered at all. If you’ve ever been in this situation, you’re not alone.

Common Misconfigurations

From the information you provided, several points might lead to your functions not working as intended:

Incorrect URL structure when invoking your function from the frontend.

Misconfiguration in the Firebase routing setup.

Issues within the expressed routing logic that may prevent the invocation of the function.

The Solution: Correct Routing

The solution lies primarily in ensuring your express route is correctly defined and reflects the full path expected by your hosting configuration. Here’s how to do it step by step:

Step 1: Modify Your Express Route

For your Firebase function to be properly triggered, you need to ensure the express route includes the /app prefix. Update your function definition as follows:

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

Step 2: Check Your firebase.json Configuration

With your express route correctly defined, verify your firebase.json to ensure the rewrites are properly set up:

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

Step 3: Adjust Your API Calls

Ensure any calls made from your frontend to the Firebase function are using the correct URL structure as well. For instance, in your api.js, you should have:

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

Step 4: Test Your Changes

After making these updates, deploy your changes and test the endpoint again. If everything is configured correctly, the Firebase function should now respond appropriately, and you should no longer see that confusing JavaScript error message.

Conclusion

Navigating Firebase functions and hosting can be tricky, especially when trying to streamline multiple services under a single domain. Most issues stem from routing misconfigurations or incorrect API calls. By following the steps outlined above, you should be able to resolve the functionality issues with your Firebase functions effectively.

If you continue to experience difficulties, don't hesitate to check your Firebase project settings or reach out to the Firebase community for additional support.

Happy coding!