using (var httpClient = new HttpClient())
{
    using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://hackathoncr.azure-api.net/ingredients/consult"))
    {
        request.Headers.TryAddWithoutValidation("Cache-Control", "no-cache");
        request.Headers.TryAddWithoutValidation("Connection", "keep-alive");
        request.Headers.TryAddWithoutValidation("Accept", "application/json");
        request.Headers.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate");
        request.Headers.TryAddWithoutValidation("Host", "hackathoncr.azure-api.net");
        request.Headers.TryAddWithoutValidation("User-Agent", "PostmanRuntime/7.15.2");
        request.Headers.TryAddWithoutValidation("Content-Length", "8");
        request.Headers.TryAddWithoutValidation("Postman-Token", "96ea4deb-9a50-4ebe-94dd-0f2883e607db,3291ab3c-70f8-41ea-9061-6923cdd38606");

        request.Content = new StringContent("[\"milk\"]", Encoding.UTF8, "text/plain");

        var response = await httpClient.SendAsync(request);
    }
}