Attaching a callback to a proxy request fails always

[cheddar]

On branch caronte, if you attach a callback to your proxy request, then web-incoming's stream() method gets called with false as the value of the server object. This causes it to fail to actually emit the "proxyRes" event, which results in everything breaking.

This is an example stack trace:

TypeError: Object false has no method 'emit'
    at ClientRequest.<anonymous> (/http-proxy/lib/http-proxy/passes/web-incoming.js:120:14)
    at ClientRequest.EventEmitter.emit (events.js:95:17)
    at HTTPParser.parserOnIncomingClient [as onIncoming] (http.js:1688:21)
    at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23)
    at Socket.socketOnData [as ondata] (http.js:1583:20)
    at TCP.onread (net.js:525:27)

[yawnt]

fixed in #549, thanks for reporting