asp.net core mvc log request body

Question

I would like to log incoming requests with method, path, body and other information. My problem is that after logging what I need the controller get only a null variable as the method parameter. I'm using .net core 1.1, IIoggerFactory, Serilog extension, and the following middleware method:

public async Task Invoke(HttpContext context)
    {  
        StringValues sessionId;
        var session = string.Empty;
        if (context.Request.Headers.TryGetValue("X-SessionID", out sessionId))
        {
            session = sessionId.FirstOrDefault();
            if (session != null) 
            {
                var requestBodyStream = new MemoryStream();
                var originalRequestBody = context.Request.Body;

                await context.Request.Body.CopyToAsync(requestBodyStream);
                requestBodyStream.Seek(0, SeekOrigin.Begin);

                var url = UriHelper.GetDisplayUrl(context.Request);
                var requestBodyText = new StreamReader(requestBodyStream).ReadToEnd();
                _logger.LogDebug($"{session} {context.Request.Method} {url} {requestBodyText}");

                requestBodyStream.Seek(0, SeekOrigin.Begin);
                context.Request.Body = requestBodyStream;

                await _next(context);
                context.Request.Body = originalRequestBody;
            }
        }
        await _next(context);
    }

How can I log the requests and keep the request body for the controller after the middleware?

Take a look to this question: stackoverflow.com/questions/44498802/… — jmunoa7
– jmunoa7, Commented Sep 22, 2017 at 10:30
@jmunoa7 Thanks, my problem was that I have left an else at the end of the method. — Perrier
– Perrier, Commented Sep 23, 2017 at 13:21
In ASP.NET Core 6.0 Preview you seems to already are able to inject HttpLogging. — Sviatoslav V.
– Sviatoslav V., Commented Aug 29, 2021 at 17:19

Perrier · Accepted Answer · 2017-09-23 13:23:25Z

The solution to log incoming request was fine I just forgot an else at the end of the method. Working code:

public async Task Invoke(HttpContext context)
    {  
        StringValues sessionId;
        var session = string.Empty;
        if (context.Request.Headers.TryGetValue("X-SessionID", out sessionId))
        {
            session = sessionId.FirstOrDefault();
            if (session != null) 
            {
                var requestBodyStream = new MemoryStream();
                var originalRequestBody = context.Request.Body;

                await context.Request.Body.CopyToAsync(requestBodyStream);
                requestBodyStream.Seek(0, SeekOrigin.Begin);

                var url = UriHelper.GetDisplayUrl(context.Request);
                var requestBodyText = new StreamReader(requestBodyStream).ReadToEnd();
                _logger.LogInformation($"{session} {context.Request.Method} {url} {requestBodyText}");

                requestBodyStream.Seek(0, SeekOrigin.Begin);
                context.Request.Body = requestBodyStream;

                await _next.Invoke(context);
                context.Request.Body = originalRequestBody;
            }
        } else {
            await _next.Invoke(context);
        }
    }

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