Steps to include Polly in project using Curcuit Breaker pattern:

1. Have your project grab the ASPNET Core 2.1 packages from nuget. You'll typically need the AspNetCore metapackage, and the extension package Microsoft.Extensions.Http.Polly.

2. Configure a client with Polly policies, in Startup. Insert this two private methods:

privatestaticIAsyncPolicy<HttpResponseMessage>GetRetryPolicy(){returnHttpPolicyExtensions.HandleTransientHttpError().OrResult(msg =>msg.StatusCode==System.Net.HttpStatusCode.NotFound).WaitAndRetryAsync(6, retryAttempt =>TimeSpan.FromSeconds(Math.Pow(2,retryAttempt)));}privatestaticIAsyncPolicy<HttpResponseMessage>GetCircuitBreakerPolicy(){returnHttpPolicyExtensions.HandleTransientHttpError().CircuitBreakerAsync(5,TimeSpan.FromSeconds(30));}

3. In your standard Startup.ConfigureServices(...) method, start by configuring a named client as below:

services.AddHttpClient("ProfileHttpClient").AddPolicyHandler(GetRetryPolicy()).AddPolicyHandler(GetCircuitBreakerPolicy());whereProfileHttpClient-your HTTP client implementation