Fixed “absurd capacity: 4294830132, maximum size: 2147483648 bytes” problem.

NSInvalidArgumentException', reason: ' -[NSConcreteMutableData initWithCapacity:]: absurd capacity: 4294830132, maximum size: 2147483648 bytes
It looks like some http servers return strange content sizes. Using init instead of initWithCapacity
and ignoring the content size here fixes the crash.