Retry-Policy -> The request message was already sent.

[HaukeBrackhagen]

We are developing a Blazor (client sided) Frontend. Inside this Frontend we want to use a generated OpenAPI-Client to ease the access to our Backend.

These are the options we use to generate the client: Version 5.1.0 csharp-netcore target-framework net5.0 library httpclient

Works fine.

But, we also want to implement a retry-policy. Something like that:

RetryConfiguration.AsyncRetryPolicy = Policy<HttpResponseMessage>.HandleResult(rm => rm.StatusCode == System.Net.HttpStatusCode.Unauthorized).RetryAsync(1, onRetryAsync: async (response, retryCount, context)=>
{
	DoSomething()
});

Problem is:

• first request is executed and returns 401as expected
• DoSomething() is called
• Retry is not possible -> The request message was already sent.

Our guess is that the error is made here (generated ApiClient.cs), and that client.SendAsync is reusing the request which is not possible.

if (RetryConfiguration.AsyncRetryPolicy != null)
{
	var policy = RetryConfiguration.AsyncRetryPolicy;
	var policyResult = await policy
		.ExecuteAndCaptureAsync(() => client.SendAsync(req, cancellationToken))
		.ConfigureAwait(false);
	response = (policyResult.Outcome == OutcomeType.Successful) ?
		policyResult.Result : new HttpResponseMessage()
		{
			ReasonPhrase = policyResult.FinalException.ToString(),
			RequestMessage = req
		};
}
else
{
	response = await client.SendAsync(req, cancellationToken).ConfigureAwait(false);
}

[Kiechlus]

This issue does not appear when using restsharp library instead of httpclient.

When using httpclient, I reproduced this also on a newer version: Version 7.6.0 csharp target-framework net8.0