Wrong URL on subscription verification #4
Description
When the hub verifies a subscription to appends another question-mark ('?') to the callback URL even if it already contains parameters.
127.0.0.1 - - [07/Jul/2012:23:05:53 +0200] "GET /~natanael/index.php?c=push&a=callback?hub.challenge=1llvqgh&hub.topic=http%3A%2F%2Flocalhost%2F%7Enatanael%2Fmyfeed&hub.mode=subscribe HTTP/1.0" 200 1748 "-" "Twisted PageGetter"
Note: the spec says in section 6.1.1:
The callback URL MAY contain arbitrary query string parameters (e.g., ?foo=bar&red=fish). Hubs MUST preserve the query string during subscription verification by appending new parameters to the end of the list using the & (ampersand) character to join.