C# Polly for handling error http responses

Question

I am trying to implement within a constructor the Polly for handling HTTP error statuses, but I get an error saying:

The non-generic method cannot be used with type arguments.

I used the code from their website though. Here it is:

 public BaseApiManager()
        {
           Retry = Policy.HandleResult<HttpResponseMessage>(r => r.StatusCode == HttpStatusCode.InternalServerError)
                        .OrResult<HttpResponseMessage>(r => r.StatusCode == HttpStatusCode.BadGateway)
                        .WaitAndRetry(3, retryAttempt => TimeSpan.FromSeconds(5));
        }

The error is on the second line, at the OrResult. I also tried using it with ApiResponse<T>, which is my generic class, but it does not work as well. What am I doing wrong ?

Looking on documentation: https://github.com/App-vNext/Polly your code seems ok. But maybe you have method named HttpResponseMessage? — Grzesiek Danowski, Nov 14 '18 at 13:39
No, I use the default one. But it acts like it wants a bool instead. — MariaAndrews, Nov 14 '18 at 13:48
I also have above the declaration : private RetryPolicy Retry { get; } — MariaAndrews, Nov 14 '18 at 13:49
There was an error in the documentation on the Polly website. It has now been corrected. — mountain traveller, Nov 14 '18 at 17:53
Does this answer your question? [How to set Polly Retry for the set specific StatusCodes only](https://stackoverflow.com/questions/61019007/how-to-set-polly-retry-for-the-set-specific-statuscodes-only) — Michael Freidgeim, Mar 03 '23 at 20:35

score 1 · Answer 1 · answered Nov 14 '18 at 17:43

It should work as follows:

Policy.HandleResult<HttpResponseMessage>(r => r.StatusCode == HttpStatusCode.InternalServerError)
                    .OrResult(r => r.StatusCode == HttpStatusCode.BadGateway)
                    .WaitAndRetry(3, retryAttempt => TimeSpan.FromSeconds(5));

The .OrResult(...) does not need generic type arguments, because the .Handle<HttpResponseMessage>(...) clause has already bound the policy to handle results of type HttpResponseMessage.

score 0 · Answer 2 · answered Nov 14 '18 at 14:16

0

Correct your Retry definition specifing type:

private RetryPolicy<HttpResponseMessage> Retry { get; }

answered Nov 14 '18 at 14:16

Grzesiek Danowski

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C# Polly for handling error http responses

2 Answers2