Will Polly create new request on retry or use same request?

[shagilt]

Summary: What are you wanting to achieve? We are adding new handler to add header in the request before sending request. I see when retry happens, I see header is already present from previous retry. Will Polly use same request in each retry?

What code or approach do you have so far?
This is the extension I am using

    public static IHttpClientBuilder AddPolicyHandler(this IHttpClientBuilder builder, Func<IServiceProvider, HttpRequestMessage, IAsyncPolicy<HttpResponseMessage>> policySelector);

[reisenberger]

TL;DR

Will Polly use same request in each retry?

Yes

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A Polly retry policy in a delegating handler created by HttpClientFactory does not create a new HttpRequestMessage; it just retries using the HttpRequestMessage which has been passed to it. The lifetime/scope of HttpRequestMessage is controlled by whatever created it - HttpClient, or your code if you create the HttpRequestMessage and pass it into an overload on HttpClient which takes HttpRequestMessage as an input parameter.

To understand how HttpClientFactory uses the policy in a delegating handler, here you can see the latest source code of the DelegatingHandler which HttpClientFactory creates, to wrap the Polly policy.

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The extension overload you quote

public static IHttpClientBuilder AddPolicyHandler(this IHttpClientBuilder builder, Func<IServiceProvider, HttpRequestMessage, IAsyncPolicy> policySelector);

takes the existing HttpRequestMessage as an input parameter, and returns (selects or creates) a policy using it.

[shagilt]

Thank you @reisenberger