from contextlib import closing
import urllib2
import unittest
import sys

def fetch_url2(url, timeout=7):
    request = urllib2.Request(url)    
    with closing(urllib2.build_opener().open(request, timeout=timeout)) as response:
        return        

class Test(unittest.TestCase):

    def test_fetch_url_1000x(self):
        for x in range(1000):
            try:
                # timeout set to 2ms to generate as many errors as posible
                fetch_url2('http://example.com/', timeout=.002)
                sys.stderr.write('.');sys.stderr.flush()
            except urllib2.URLError:
                sys.stderr.write('x');sys.stderr.flush()
    
test_suite = unittest.TestSuite([Test("test_fetch_url_1000x")])
    
if __name__ == "__main__":
    import os
    print "PID: %d" %os.getpid()
    unittest.main()