I created a simple threaded python server, and I have two parameters for format, one is JSON (return string data) and the other is zip.  When a user selects the format=zip as one of the input parameters, I need the server to return a zip file back to the user.  How should I return a file to a user on a do_GET() for my server?  Do I just return the URL where the file can be downloaded or can I send the file back to the user directly?  If option two is possible, how do I do this?
Thank you
The issue was that I hadn't closed the zipfile object before I tried to return it.  It appeared there was a lock on the file.
To return a zip file from a simple http python server using GET, you need to do the following:

Set the header to 'application/zip'
self.send_header("Content-type:", "application/zip")
Create the zip file using zipfile module
Using the file path (ex: c:/temp/zipfile.zip) open the file using 'rb' method to read the binary information
openObj = open( < path > , 'rb')
return the object back to the browser
openObj.close()
 del openObj
 self.wfile.write(openObj.read())
That's about it. Thank you all for your help.
Issue with Python Server Returning File On GET