Using Polly for Resilience in ASP.NET Core

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Using Polly for Resilience in ASP.NET Core

Modern applications often rely on external APIs, databases, and services, making them vulnerable to transient failures like timeouts, network glitches, or temporary unavailability. To ensure stability, developers need resilience strategies—and that’s where Polly comes in.

Polly is a .NET resilience and transient-fault-handling library that allows you to define policies like Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback. Instead of writing custom error-handling logic, you wrap your HTTP calls or operations with these policies to gracefully handle failures.

In ASP.NET Core, Polly integrates seamlessly with HttpClientFactory. For example, you can configure retries with exponential backoff when calling third-party APIs, or use a circuit breaker to stop sending requests when a service is consistently failing—preventing further strain on the system.

Here’s a quick example:

services.AddHttpClient("MyApiClient")

    .AddTransientHttpErrorPolicy(p => 

        p.WaitAndRetryAsync(3, retry => TimeSpan.FromSeconds(retry)))

    .AddTransientHttpErrorPolicy(p =>

        p.CircuitBreakerAsync(5, TimeSpan.FromSeconds(30)));

With this setup, your app automatically retries failed requests and avoids overwhelming a failing service.

By leveraging Polly, ASP.NET Core apps become more resilient, fault-tolerant, and user-friendly, ensuring smoother experiences even during unexpected outages. 

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