Downloading huge files via urllib

[VanL]

Hello,

For various reasons, I have to use https to download large (20+ MB) text 
files which I then parse.  I set up a basic function to do this using 
urllib:

response = urllib.urlretrieve(serverURL, 'run.log')

However, I then get a MemoryError.  Tracking down the source of the 
error, I see the offending function in httplib:

    def makefile(self, mode, bufsize=None):
        """Return a readable file-like object with data from socket.

        This method offers only partial support for the makefile
        interface of a real socket.  It only supports modes 'r' and
        'rb' and the bufsize argument is ignored.

        The returned object contains *all* of the file data
        """

I think the problem is that bufsize argument that is ignored.  Does 
anyone know if this is correct, and what I can do about it?  I would 
like to automate the process of downloading this file, but is it possible?

Thanks,

VanL