All adapters now send a disconnect notification when they're done communicating with the HTTP server. This notification won't be sent in case an exception is thrown first, but will still be sent when an HTTP error was received from the remote server. Also fixes a trailing line feed in the Listener and a typo in one of the tests.
… adapter, we weren't settings options right
… so they both pass it, I changed the header capitalization to match the spec so Content-Type not content-type or Content-type