Fallback Pattern in .NET Core: Handling Service Failures Gracefully

Fallback pattern is a resilience design pattern

This pattern ensures that alternative response will reach to client even in case of failing primary API.

The Fallback pattern is a resilience design pattern used to provide an alternative or backup solution when the primary service or component fails. It helps ensure that the application continues to function and provide some level of service, even if certain parts are not working as expected.

It ensures service continuity, improves user experience, and provides significant business benefits by reducing the impact of failures.

Problems Resolved by the Fallback Pattern

1. Continuity of Operations: Ensures critical operations are not interrupted by providing alternative paths for execution.

2. Service Unavailability: When a primary service is down or unavailable, the fallback pattern provides an alternative, ensuring that the application continues to function.

3. Error Handling: It allows the system to handle errors gracefully without crashing, maintaining a smooth user experience.

4. Enhanced User Experience: Minimizes disruptions for end-users, maintaining their trust and satisfaction.

Implementation

Steps
a. We will create 2 Endpoints Primary and Secondary API

b. Primary API will throw error

c. We will implement Fallback Policy into separate Api end point, or we can also create console application client

d. To implement Fallback we will use polly nuget package and we will configure both end point and will define policy like if API 1 not responding then Request go to API 2 and will respond

Click here for code implementation