Save a stream to a file.
var saveTo =var stream = fs
streamis the source stream, for example a request.
destinationis the path where the stream will be saved.
The options are:
destination- if you don't specify destination as an argument.
length- expected byte length. Throws an error if it does not match the stream's length.
limit- maximum byte length. Throws an error if the stream is larger than this size.