Apache/Tomcat Size Of File Transfered

[Jamwa]

Am looking to determine how much of a file was downloaded in either Apache or Tomcat web servers.

Looking at a sample entry on the Apache log files:

127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326

The last entry shows the size of the object returned to the client. So suppose I have placed a downloadable 3kb file on the server, and the user downloads only 1kb of it, I would like it to show 1000 not 3000 as it shows, regardless.

Any help please?

[cliff76]

My guess is that you'd need some custom servlet logic. A servlet could respond to the file request incrementally read/write the file to the response.outputStream and count the bytes transferred and write the total to a log file. On the cases where the client closes the connection prematurely the servlet would have to catch the IOException (I believe its manifests as a broken pipe exception) and respond accordingly. It might look something like:

long bytesXferred = 0;
try {
  FileInputStream responseFile = getResponseFileFromRequest(request);
  for(int count = responseFile.read(buffer, 0, buffer.length); count !=-1; count = responseFile.read(buffer, 0, buffer.length)) {
    response.getOutputStream.write(buffer, 0, buffer.length);
  }
}catch(IOException e) {
}finally{
  getLogger().log("Transferred " + bytesXFerred + " bytes.");
}

Now that I think of it, using the approach in the above sample (written completely ad-hoc and untested) would likely yield in an HTTP chunk-file transfer where content length is unknown while it is delivered in chunks. Each chunk size would show in your logs which could be inspected to derive the total size.