Http request help for retrieving result as string or as stream.

HttpRequestHelper.cs

public class HttpRequestHelper
{
   public static async Task<string> PostReturnString(RequestArgs query, string uri)
	 {
		 using (var httpClient = new HttpClient())
		 {
			  var response = await httpClient.PostAsync(new Uri(uri),
								new StringContent(JsonConvert.SerializeObject(query), Encoding.UTF8, "application/json"));
			  var responseContent = await response.Content.ReadAsStringAsync();

			  return responseContent;
		  }
	 }
   
   public static async Task<IReadOnlyCollection<Result>> PostReturnStream(RequestArgs query, , string uri)
	 {
		  var request = new HttpRequestMessage(HttpMethod.Post, new Uri(uri));
		  request.Content = new StringContent(JsonConvert.SerializeObject(query), Encoding.UTF8, "application/json");
		
		  CancellationToken cancellationToken = new CancellationToken();
		  using (var httpClient = new HttpClient())
		  {
			    using (var result = await httpClient.SendAsync(request, HttpCompletionOption.ResponseContentRead, cancellationToken).ConfigureAwait(false))
			    {
				      using (var contentStream = await result.Content.ReadAsStreamAsync())
				      {
					      return await System.Text.Json.JsonSerializer.DeserializeAsync<List<Result>>(contentStream);
				      }
			    }

		   }
	  }
}