polly retry with fallback
I haven't looked at the others yet. It is important to have the circuit working on a higher level than the call (i.e. not in the 200 range. I don't see a link on the GitHub, and I tried searching NuGet for Polly.Contrib and Polly.Contrib.LoggingPolicy. If I am concentrating on Spirit Guardians when I am True Polymorphed into a copper piece, can I continue to concentrate to maintain the spell? In this example, when the Fallback policy receives the HttpResponseMessage and sees that it is a 500, the onFallback delegate is executed. Polly Fallback policy causes “ObjectDisposedException: Cannot access a closed Stream” the 2nd time fallback is activated on ASP.NET Core 3.1. The policy behaves as described above, ending with the Fallback policy generating a new HttpResponseMessage. The Fallback policy allows you to perform any action when a request fails, this could be restarting a service, messaging an admin, scaling out a cluster, etc. Imagine this: I want a retry on the authentication api but only when I receive a RequestTimeout (Http status code 408). If you don’t want to code along, execute the following command in the PollyFallbackWeatherService directory to checkout the finished code: If you are coding along, add the NuGet package Microsoft.Extensions.Http.Polly to the WeatherService project, being sure to pick the version that works with the version of .NET Core you are using. Polly Retry policy with Function is not waiting for result, Identify completion of final retry by Polly retry policy. Is it legal for Microsoft to install software without user approval? Execute the following command-line instruction in your console window: Your request will first hit the Weather Service, which then makes a request to the Temperature Service. After adding some logging to the service and creating the unit test I got this log result: The unit test is a bit “funny”. Disclaimer: this article and sample code have nothing to do with the work I did for the eCommerce website. Asking for help, clarification, or responding to other answers. rev 2020.10.21.37848, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Jitter: Making Things Better With Randomness Question: is it ok to throw exception from Fallback? The case study software in the companion repository consists of two Visual Studio ASP.NET Core 2.1 Web API solutions, one implementing a Weather Service and the other a Temperature Service. Also, the shown code might not always show the best way to implementat things, it is just an example to explain some use cases of Polly. Check out the elevator pitch while you’re there. This spreads out the spikes when issues arise. https://github.com/App-vNext/Polly/wiki/Polly-and-HttpClientFactory, Polly (.NET resilience and transient-fault-handling library)


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