public async Task <Stream> GetStreamAsync(string relativePath)
{
// https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/console-webapiclient
Console.WriteLine($"Calling with GetStreamAsync method to {relativePath}");
await SetAuthorizationHeader();
Stream response = null;
try
{
// When status code is not in the range of [200, 299] GetStreamAsync throws an exception
response = await _httpClient.GetStreamAsync(relativePath);
// TODO: add debug switch
// response = ParseStreamToJson(response);
return(response);
}
catch (HttpRequestException ex)
{
// There may not be any response when there is an exception
if (response != null)
{
ParseStreamToJson(response);
}
if (ex.Message.IndexOf("404") > 0)
{
// Possible 404 messages (JSON) which are not available when call _httpClient.GetStreamAsync, reference only
// 1. wrong entity says: message: "Resource not found for the segment 'contactscontacts'.", code: ""
// 2. does not exist by ID: message: "contact With Id = 5f880511-b362-e611-80e3-c4346bc43f08 Does Not Exist"
// 3. does not exist by alternative key: message: "A record with the specified key values does not exist in contact entity"
// Query without result: empty value [], 200 status code
Console.WriteLine($"404, problematic uri: {relativePath}");
}
else if (ex.Message.IndexOf("401") > 0)
{
Console.WriteLine("Unauthorized. Likely cache has been corrupted.");
}
else
{
Console.WriteLine("Other exception:");
Console.WriteLine(ex.ToString());
}
}
catch (Exception ex)
{
// this is a rough handling
Console.WriteLine(ex.GetType().ToString());
if (response != null)
{
ParseStreamToJson(response);
}
Console.WriteLine("The request failed with an error.");
Console.WriteLine("Base address: {0}", _httpClient.BaseAddress);
Console.WriteLine(ex.Message);
while (ex.InnerException != null)
{
Console.WriteLine("\t* {0}", ex.InnerException.Message);
ex = ex.InnerException;
}
}
return(null);
}
