Styjun

In one of my project I had added delegate handler to log incoming and outgoing requests. For Logging I am using Nlog. I was generating a unique Id, per request to relate logs with this specific Id.
This worked fine for me. Now recently I modified my code in handler, and set HttpContext.Currnet.Item value to this unique id. Now I am supposed to get this id, and pass it to external Apis.

Issue I faced is inside controller HttpContext.Current is null.
I know what is the main root cause. This is because of handler.SendAsync, which will make the thread SynchronizationContext as null.

I want to pass HttpContext.Current to my ongoing threads.

What I did:

I set ConfigureAwait(false)
I set appsettings -> aspnet:UseTraskFriendlySynchronizationContext to true

but these are not working.

I am using .net framework 4.7.1

Thanks @Alexander,
After your comments I reviewed my code again and found this problem is not caused by await base.SendAsync(), Infact I was calling internal methods with async, which ruined HttpContext.Current.

For reference bellow is my DelegatingHandler Implementation. Before this I defined two methods i.e. IncommingMessageAsync(), OutgoingMessageAsync as Async. Now I had changed it to simple methods. Because I don't want Task in these methods.

 public class MessageHandler : DelegatingHandler

 private static NLog.Logger logger;
 HttpContext context;

 public MessageHandler()
 
 logger = NLog.LogManager.GetCurrentClassLogger();
 
 protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
 
 var correlationID = $"DateTime.Now.TicksThread.CurrentThread.ManagedThreadId";
 context = HttpContext.Current;
 context.Items["correlationID"] = correlationID; //used in Nlog aspnet-item:variable=correlationID
 IncommingMessageAsync(request);
 var response = await base.SendAsync(request, cancellationToken);
 context.Items["responseTime"] = DateTime.Now;
 HttpContext.Current = context;
 OutgoingMessageAsync(response);
 return response;
 
 protected void IncommingMessageAsync(HttpRequestMessage request)
 
 logger.Info("Request Received from URL", request.Method + " " + request.RequestUri);
 
 protected void OutgoingMessageAsync(HttpResponseMessage response)
 
 if (response.IsSuccessStatusCode)
 
 logger.Info("Resposne Returned with Status Status", response.StatusCode);
 
 else
 
 logger.Warn("Resposne Returned with Status Status", response.StatusCode);