I use below code to get the outgoing request/response from telemetry initializer in my Asp.Net Core service:

    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is DependencyTelemetry)
        {
            var dependencyTelemetry = telemetry as DependencyTelemetry;

            if (dependencyTelemetry.TryGetOperationDetail("HttpRequest", out var request))
            {
                var httpRequest = request as HttpRequestMessage;
            }

            if (dependencyTelemetry.TryGetOperationDetail("HttpResponse", out var response))
            {
                var httpResponse = response as HttpResponseMessage;
            }
        }
    }

I can get request successfully with above code, but the response from TryGetOperationDetail is always null. Anything wrong in my code?

CodePudding user response：

For me, This code recorded all the headers sent to dependency and also response have been tracked.

public void Initialize(ITelemetry telemetry)
    {
        var dependecyTelemetry = telemetry as DependencyTelemetry;
        if (dependecyTelemetry == null) return;

        if (dependecyTelemetry.TryGetOperationDetail("HttpRequest", out object request)
            && request is HttpRequestMessage httpRequest)
        {
            foreach (var item in httpRequest.Headers)
            {
                if (!dependecyTelemetry.Properties.ContainsKey(item.Key))
                    dependecyTelemetry.Properties.Add(item.Key, string.Join(Environment.NewLine, item.Value));
            }
        }
        if (dependecyTelemetry.TryGetOperationDetail("HttpResponse", out object response)
            && response is HttpResponseMessage httpResponse)
        {
            var responseBody = httpResponse.Content.ReadAsStringAsync().GetAwaiter().GetResult();
            if (!string.IsNullOrEmpty(responseBody))
                dependecyTelemetry.Properties.Add("ResponseBody", responseBody);
        }
    }

For further reference on telemetry refer this site