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Learn how to configure Azure App Service to ensure API calls are properly routed to your controllers in your Blazor Progressive Web App (PWA). This guide breaks down the steps for a seamless setup.
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How to Configure Azure App Service for API Calls in Your Blazor PWA

Deploying your Blazor WebAssembly Progressive Web App (PWA) to Azure App Service can be a rewarding experience, but it may come with some challenges. One common issue developers encounter is the routing of API calls to the appropriate controllers. If your API endpoints return a "Sorry, there's nothing at this address" message, it can be frustrating when your application works perfectly in a development environment. In this guide, we’ll explore how to correctly configure Azure App Service to ensure those API calls reach their intended destination.

Understanding the Problem

When you deploy your Blazor PWA, you might notice that calls to your API controllers are not functioning as expected. This can be particularly confusing if everything works seamlessly during local development. The typical symptom of this issue is that any requests made to your /api endpoints return a default message, indicating that those routes are unmatched.

This situation often arises from a configuration oversight, particularly with how your application is structured and deployed. In your case, where the app is deployed via Azure Pipeline CI, it's crucial to ensure the correct components are being published to the Azure App Service.

Solution: Correcting Your Azure Deployment Configuration

Here’s how to resolve this issue effectively by ensuring that the appropriate projects are being deployed:

Step 1: Identify Your Project Structure

In a typical Blazor hosted application, you have three projects:

Client: The Blazor WebAssembly app.

Server: The API layer that handles requests.

Shared: The common data structures and models.

Step 2: Adjust Your Continuous Integration Pipeline

The key to resolving your routing issue lies within the configuration of your Azure Pipeline CI. Specifically, you need to ensure that the pipeline is set up to deploy the Server project, not just the Client project.

Edit your deployment pipeline: Verify that your YAML or configuration file properly includes the steps to build and deploy the Server project.

Include necessary dependencies: Make sure the Server project is aware of all routes and dependencies that might be necessary for the API to function correctly.

Step 3: Test Your Configuration

Once you’ve modified the pipeline to include the Server project:

Redeploy your application: This can typically be accomplished by triggering a new build or release in Azure Pipelines.

Test the API endpoints: Navigate to your /api URLs after redeployment. Confirm that they now correctly route to your designated controllers.

Conclusion

By ensuring that your Azure CI/CD pipeline is configured to deploy your Server project, you can effectively resolve issues related to API calls in your Blazor PWA. This adjustment should vastly improve your application’s functionality and provide a smoother user experience.

Always remember to rerun your tests in different environments to catch any discrepancies between local development and production settings.

If you're encountering further issues or have additional questions, don't hesitate to reach out for more insights.