No Pusher method/options to add Http headers for web-socket connection establishment

[vrjgamer]

What is the issue?

I need to send "origin" header to the server while I establish connection to it. But I couldn’t find any method or pusher options to do so. And the httpAuthorizer only sends headers when a private subscription is performed. As I investigated the Webscoket implementation for this library, I see that there is a WebsocketClient Constructor which takes in httpHeaders as an optional parameter which can solve my issue.

Any improvements you suggest

An additional constructor can be added to WebSocketClientWrapper (which extends the WebsocketClient) which takes a map of httpHeaders as a parameter and then update the super call to send in the httpHeaders.
With this change, a new PusherOptions method can be added which can take httpHeaders as a parameter and supply it up the chain.

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CC @pusher/mobile