--- /usr/lib/python2.3/urllib2.py	2004-02-24 02:34:02.000000000 -0600
+++ urllib2.py	2004-03-24 15:43:50.000000000 -0600
@@ -494,8 +494,11 @@
     def proxy_open(self, req, proxy, type):
         orig_type = req.get_type()
         type, r_type = splittype(proxy)
+        # Handle the case where http_proxy is specified as "host:port"
+        if type and type not in ('http', 'https', 'ftp'):
+            type, r_type = 'http', proxy
         host, XXX = splithost(r_type)
-        if '@' in host:
+        if host and '@' in host:
             user_pass, host = host.split('@', 1)
             if ':' in user_pass:
                 user, password = user_pass.split(':', 1)