ErrorLoggerMiddleware.cs

    public class ErrorLoggerMiddleware
    {
        private readonly RequestDelegate m_NextDelegate;
        private readonly IEventLogger m_EventLogger;
        private readonly IDbLogger m_DbLogger;

        public ErrorLoggerMiddleware(RequestDelegate next, IEventLogger eventLogger, IDbLogger dbLogger)
        { 
            m_NextDelegate = next;
            m_EventLogger = eventLogger;
            m_DbLogger = dbLogger;
        }

        public async Task Invoke(HttpContext context)
        {
            bool isApiRequest = context.Request.Path.Value.Contains("/api");
            if (isApiRequest)
            {
		// thanks to the SO post - https://stackoverflow.com/questions/37855384/how-to-log-the-http-response-body-in-asp-net-core-1-0/38275942#38275942
                string requestBodyText = string.Empty;
                try
                {
                    Stream originalBody = context.Request.Body;
                    using (StreamReader reader = new StreamReader(context.Request.Body))
                    {
                        requestBodyText = await reader.ReadToEndAsync();
                        context.Request.Body = new MemoryStream(Encoding.UTF8.GetBytes(requestBodyText));
                        await m_NextDelegate.Invoke(context);
                        context.Request.Body = originalBody;
                    }
                }
                catch (Exception e)
                {
		    // provide own implementation
                    m_DbLogger.TryLog(context, e);
                    m_EventLogger.TryLog(context, e, requestBodyText);

                    context.Response.ContentType = "application/json";
                    context.Response.StatusCode = 500;
                    PostResult response = new PostResult();
                    response.FatalException = true;
                    await context.Response.WriteAsync(JsonConvert.SerializeObject(response));
                } 
            }
            else
            {
                await m_NextDelegate.Invoke(context);
            }
        }
    }