Fix Issue4493 - urllib2 adds '/' to the path component of url, when it does not

starts with one. This behavior is exhibited by browser and other clients.

Lib/urllib/parse.py

@@ -699,7 +699,12 @@ def splithost(url):
         _hostprog = re.compile('^//([^/?]*)(.*)$')
 
     match = _hostprog.match(url)
-    if match: return match.group(1, 2)
+    if match:
+        host_port = match.group(1)
+        path = match.group(2)
+        if path and not path.startswith('/'):
+            path = '/' + path
+        return host_port, path
     return None, url
 
 _userprog = None