function IsWritableStreamLocked(stream) {
		        if (stream._writer === undefined) {
		            return false;
		        }
		        return true;
		    }
Write a Body to a Node.js WritableStream (e.g. http.Request) object.

@param {Stream.Writable} dest The stream to write to.
@param obj.body Body object from the Body instance.
@returns {Promise<void>}