Sending a file with HTTP Request doubt

[Ananda]

          Hi All,

          I wish to do the following :
          In a looped HTTP POST you can send a file along with your request.
  e.g. the file looks like this -

  <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  <DeviceDetails>
      <DeviceID>device1</DeviceID>
      <HostName>My-device</HostName>
  </DeviceDetails>

  I want to change the <DeviceID>device1</DeviceID> to device2, device3,...
for each new thread I am spawning, i.e for each connection to the server I
am testing.
  Is this possible ? How ?
  Please reply to my id.

  Thanks & Regards,
  Ananda.
  Infosys Technologies Ltd.

  Bangalore.
  Ph: +91-80-5010149
  www.infosys.com