http post goes into $_REQUEST instead into $_FILES

[cerr]

Hi,

I have a Python script that is executing an http POST to transfer a file from the client to the server. I have achieved this with below code:

from binascii import hexlify, unhexlify
from httplib import HTTPConnection, HTTPException
import os
import hashlib
import socket
import urllib2
import time
import subprocess

import MultipartPostHandler

    def post_file(filename, data):
        try:
            wakeup()
            socket.setdefaulttimeout(TIMEOUT)
            #create multipartpost handler
            opener = urllib2.build_opener(MultipartPostHandler.MultipartPostHandler)
            #set POST arguments
            host = HOST
            func = "post_file"
            fname = filename
            #assemble post URL
            url = "http://{0}{1}".format(host, URI)
            print "POSTING "+fname
            #assemble multipart header
            data = {"data":data,"f":func,"fname":filename}
            #execute POST
            response = opener.open(url, data, timeout=TIMEOUT)
            #reads server return value
            retval = response.read()
            print retval
            if "SUCCESS" in retval:
                return 0
            else:
                print "RETVAL: "+retval
                return 99
        except Exception as e:
            print "EXCEPTION time "+str(time.time())+" - "+str(e)
            return 99

but my problem is, the data gets posted to the sever but arrives in the `$_REQUEST` array and I'm expected to post stuff so that it arrives in the `$_FILES` array (this is a LAMP server). How do I need to modify my code to deliver it correctly?

Thank you,