HTTPBodyStream -> String in Swift

stream.swift

var data = NSMutableData()
var buffer = [UInt8](count: 4096, repeatedValue: 0)
request.HTTPBodyStream?.open()
while request.HTTPBodyStream!.hasBytesAvailable {
    let length = request.HTTPBodyStream!.read(&buffer, maxLength: 4096)
    if length == 0 {
        break
    } else {
        data.appendBytes(&buffer, length: length)
    }
}
println(NSString(data: data, encoding: NSUTF8StringEncoding)!)