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From "Johnny Kewl" <>
Subject Re: Measuring bytes sent and received from and to Tomcat
Date Tue, 23 Oct 2007 05:26:11 GMT

Now Tomcat is also a cool application server
----- Original Message ----- 
From: "Dave Rathnow" <>
To: "Tomcat Developers List" <>
Sent: Monday, October 22, 2007 10:00 PM
Subject: Measuring bytes sent and received from and to Tomcat

Hi there, interesting question, more I think about it, more complicated it 
gets ;)

Dont think its easy from TC, its too sophisticated, compression, SSL, 
redirects, dispatches, clustering... think its hard to get a true network 

I would plunder something like TCPMon
Its a NB plugin so can play with it first....

Its really just a (bind - client) ie port 8080 to 8081 type idea - so its 
easy to install, and easy to setup across multiple sites, clusters etc etc.

Steal this (relay or tunnel) code and just mod it... I think you will be 
able to modify it for client IP's cookies, special headers... anything
and then call it from a browser and get client billing breakdowns.... 

We have an application that collects data from, and sends data to,
remote embedded devices.  Traditionally we have used TCP and UDP to send
and receive data over satellite.  The latest release of our product will
be using other communication medium with our devices making HTTP request
to our application that is running under JBoss/Tomcat.

The way we bill our clients is by charging them a usage fee based on the
number of bytes being sent over the air/wire.  Because of this, we need
to have a accurate count of the number of bytes sent and received from
each site, which is uniquely identified by it's IP address.  Using
either UDP and TCP this is simple as we are in control of the end

Is there a way we can do the same thing with Tomcat?  It's simple for us
to measure the number of byte in the payload of the HTTP
request/response, however that isn't enough.  We need to know the total
number of bytes being sent and received for each HTTP request.

Can someone suggest a way I could get an accurate count of these bytes?


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