Analyze ID with Azure Form Recognizer

FormRecognizer.cs

/// <summary>
/// Sends an image to Form Recognizer and returns back the URL that contains the result
/// </summary>
/// <returns></returns>
private async Task<string> StartAnalyzingImage()
{
    var queryString = HttpUtility.ParseQueryString(string.Empty);

    var client = _httpClientFactory.CreateClient();

    // set the key
    client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "<Azure key>");

    // set the endpoint
    var formRecognizerEndpoint = "https://northeurope.api.cognitive.microsoft.com/";

    queryString["includeTextDetails"] = "true";

    var uri = $"{formRecognizerEndpoint}/formrecognizer/v2.1-preview.3/prebuilt/idDocument/analyze?{queryString}";

    var image = System.IO.File.ReadAllBytes(@"d:\license.jpg");
    using var content = new ByteArrayContent(image);
    content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
    var response = await client.PostAsync(uri, content);

    if (response.IsSuccessStatusCode)
    {
        // if the response is successful, it means that Form Recognizer started processing our image
        // in order to get the result, we have to make GET requests to an URL
        // that URL is provided in a header named "Operation-Location"
        // below we're going to retrieve that URL and send it back to the caller of the function
        var location = response.Headers.FirstOrDefault(h => h.Key == "Operation-Location");
        return location.Value.FirstOrDefault();
    }

    return string.Empty;
}