URLFile: include url in bad status code error

common/url_file.py

@@ -72,7 +72,8 @@ class URLFile(object):
     if response_code == 416: #  Requested Range Not Satisfiable
       return ""
     if response_code != 206 and response_code != 200:
-      raise Exception("Error {}: {}".format(response_code, repr(dats.getvalue())[:500]))
+      raise Exception("Error {} ({}): {}".format(response_code, self._url, repr(dats.getvalue())[:500]))
+
 
     ret = dats.getvalue()
     self._pos += len(ret)