[Skunkworks] File Transfer Logs

Is there a way to configure either Apache or Tomcat web servers so as for it to display how much data was transferred in a given session? This is what I mean; Suppose I have a file on localhost that can be downloaded by visiting http://localhost/service/file.zip. The file.zip is 123456 bytes long. If someone downloads it completely, then I expect that 123456 bytes to have been transferred. Suppose someone cancels mid-way, or an error occurs, then there is a log to show that file transfer was not complete. Any idea(s)?