support for additional headers / wss port

[vukasin]

hi,

i am using wss client to access a server which requires me to send credentials (basic). that involves adding headers to the request which the current interface does not allow. i have changed a few constructors by adding an additional parameter (with a default value to avoid breakage) which allows you to add any number of custom http headers to your request. that has worked very nicely for me so i thought i'd share it.

i have also changed the default port for wss in the tornado client from 80 to 443.

[EliAndrewC]

For what it's worth, you can add custom headers today when you subclass one of the ws4py.client classes, which you have to do to override received_message anyway, e.g.

from ws4py.client.threadedclient import WebSocketClient

custom_headers = [('Custom-Header', 'custom header value')]

class Client(WebSocketClient):
    def received_message(self, message):
        print("received {}".format(str(message)))

    @property
    def handshake_headers(self):
        return super(Client, self).handshake_headers + custom_headers