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    <p>The simplest was is to simply catch the IOError exception from urllib:</p> <pre><code>try: urllib.urlopen( "http://example.com", proxies={'http':'http://example.com:8080'} ) except IOError: print "Connection error! (Check proxy)" else: print "All was fine" </code></pre> <p>Also, from <a href="http://love-python.blogspot.com/2008/07/check-status-proxy-address.html" rel="noreferrer">this blog post - "check status proxy address"</a> (with some slight improvements):</p> <pre><code>import urllib2 import socket def is_bad_proxy(pip): try: proxy_handler = urllib2.ProxyHandler({'http': pip}) opener = urllib2.build_opener(proxy_handler) opener.addheaders = [('User-agent', 'Mozilla/5.0')] urllib2.install_opener(opener) req=urllib2.Request('http://www.example.com') # change the URL to test here sock=urllib2.urlopen(req) except urllib2.HTTPError, e: print 'Error code: ', e.code return e.code except Exception, detail: print "ERROR:", detail return True return False def main(): socket.setdefaulttimeout(120) # two sample proxy IPs proxyList = ['125.76.226.9:80', '213.55.87.162:6588'] for currentProxy in proxyList: if is_bad_proxy(currentProxy): print "Bad Proxy %s" % (currentProxy) else: print "%s is working" % (currentProxy) if __name__ == '__main__': main() </code></pre> <p>Remember this could double the time the script takes, if the proxy is down (as you will have to wait for two connection-timeouts).. Unless you specifically have to know the proxy is at fault, handling the IOError is far cleaner, simpler and quicker..</p>
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    1. COBut some proxies can connect to the url but they don't open the actual html from that url, they show a custom error so you can't catch an exception there, wouldn't be better to check for a string in req.read()?
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