What is the method of using HttpCompletionOption.ResponseHeadersRead for Refit requests?

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HttpCompletionOption.ResponseHeadersRead is a value of the HttpCompletionOption enumeration that specifies how an HTTP request should be completed. When using this option in a Refit request, the client retrieves the response headers immediately as soon as they are available and returns the rest of the response as an ongoing stream.

To use HttpCompletionOption.ResponseHeadersRead in a Refit request, you should follow the below steps:

1. Annotate your API interface method with the HttpCompletionAttribute to specify the HttpCompletionOption.ResponseHeadersRead option as the completion option for the HTTP request.

[Get("/api/example")]
[HttpCompletionOption(HttpCompletionOption.ResponseHeadersRead)]
Task<HttpResponseMessage> GetExample();

1. Call the API method using the Refit RestService API, which returns an ongoing stream of the response body once you get the response headers.

var response = await restService.GetExample();
var stream = await response.Content.ReadAsStreamAsync();

Using this approach, the application can process large responses efficiently, without waiting for the entire response to be downloaded before starting to process it.