Authentication Origin should not be fixed to http://

I was writing a chrome extension that is using web sockets to communicate with an application running on the localhost.
A chrome extension will try authenticate itself as `Origin: chrome-extension://mnkmaflojmabglhiddgglabbfmogokfd`. This does not work as Alchemy-Websockets currently is able to authenticate origins from http:// only (https:// is not possible either). 
My commit fixes this issue.