Assuming I am doing webservice request from the client. The request is made by POST with json parameters.  

In the server, `Context.Request.RawUrl` hold the request url. But what holds the request json data? 

I need this property in order to log requests.

Here is the code for the http module:

```
  public class RequestResponseLoggerModule : IHttpModule
    {
        //private static Logger logger = LogManager.GetCurrentClassLogger();

        #region ResponseCaptureStream

        private class ResponseCaptureStream : Stream
        {
            private readonly Stream _streamToCapture;
            private readonly Encoding _responseEncoding;

            public string StreamContent { get; private set; }            

            public ResponseCaptureStream(Stream streamToCapture, Encoding responseEncoding)
            {
                _responseEncoding = responseEncoding;
                _streamToCapture = streamToCapture;
            }

            public override bool CanRead { get { return _streamToCapture.CanRead; } }
            public override bool CanSeek { get { return _streamToCapture.CanSeek; } }
            public override bool CanWrite { get { return _streamToCapture.CanWrite; } }
            public override long Length { get { return _streamToCapture.Length; } }
            public override long Position
            {
                get { return _streamToCapture.Position; }
                set { _streamToCapture.Position = value; }
            }

            public override void Flush()
            {
                _streamToCapture.Flush();
            }           

            public override int Read(byte[] buffer, int offset, int count)
            {
                return _streamToCapture.Read(buffer, offset, count);
            }

            public override long Seek(long offset, SeekOrigin origin)
            {
                return _streamToCapture.Seek(offset, origin);
            }

            public override void SetLength(long value)
            {
                _streamToCapture.SetLength(value);
            }

            public override void Write(byte[] buffer, int offset, int count)
            {
                StreamContent += _responseEncoding.GetString(buffer);
                _streamToCapture.Write(buffer, offset, count);
            }

            public override void Close()
            {
                _streamToCapture.Close();
                base.Close();
            }
        }

        #endregion

        #region IHttpModule Members

        private HttpApplication _context;
        public void Dispose()
        {

        }

        private static string Extensions_Key = "RequestResponseLoggerModule.Extensions";
        private static string Files_Key = "RequestResponseLoggerModule.Files";
        private static string Request_Key = "RequestResponseLoggerModule.Request";
        private static string Response_Key = "RequestResponseLoggerModule.Response";

        private IEnumerable<string> _Extenstions = new string[] { };
        private IEnumerable<string> _Files = new string[] { };
        private bool _LogAlwaysRequest = false;
        private bool _LogAlwaysResponse = false;

        public void Init(HttpApplication context)
        {
            _Extenstions = ConfigurationManager.AppSettings[Extensions_Key].ToLower().Split(',').
                Select(x => x.Trim()).ToArray();
            _Files = ConfigurationManager.AppSettings[Files_Key].ToLower().Split(',').
                Select(x => x.Trim()).ToArray();
            _LogAlwaysRequest = ConfigurationManager.AppSettings[Request_Key] == "ALWAYS";
            _LogAlwaysResponse = ConfigurationManager.AppSettings[Response_Key] == "ALWAYS";

            _context = context;

            context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
            context.PreSendRequestContent += new EventHandler(context_PreSendRequestContent);
        }

        void context_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            _context.Response.Filter = new ResponseCaptureStream(_context.Response.Filter, _context.Response.ContentEncoding);
        }

        void context_PreSendRequestContent(object sender, EventArgs e)
        {
            bool isMatch = false;
            if (_Extenstions.Count() > 0)
            {
                string ext = VirtualPathUtility.GetExtension(_context.Request.FilePath).
                    Substring(1).ToLower();
                if (_Extenstions.Contains(ext))
                {
                    isMatch = true;
                }
            }
            if (_Files.Count() > 0)
            {
                string fileName = VirtualPathUtility.GetFileName(_context.Request.FilePath).                   ToLower();
                if (_Files.Contains(fileName))
                {
                    isMatch = true;
                }
            }

            if (_LogAlwaysRequest || isMatch)
            {
                string requestText = _context.Request.RawUrl; <------------------

                //log the responseText, but this reurns just the url while I need the data of the webservice call
            }
            if (_LogAlwaysResponse || isMatch)
            {
                ResponseCaptureStream filter = _context.Response.Filter as ResponseCaptureStream;
                if (filter != null)
                {
                    string responseText = filter.StreamContent;
                    //log the responseText
                }
            }        
        }

        #endregion
    }

```