Get 'data' event even when the HTTP request is OK

This solves the timeout issues seen with statsd and node 0.10 and
greater. This is explained on the node blog [1]:

    WARNING: If you never add a 'data' event handler, or call resume(), then
    it'll sit in a paused state forever and never emit 'end'.

    [...]

    Most programs will continue to function normally. However, this
    introduces an edge case in the following conditions:

    * No 'data' event handler is added.
    * The pause() and resume() methods are never called.

[1] http://blog.nodejs.org/2012/12/20/streams2/