如何向node.js响应添加跨域标头

So i have a major problem. I need to get data from a little node.js server that i built and then use that data. the problem that i am having is that the error says that i can't do cross domain requests and from what i have seen i need to add a header for that. i have seen many exampled of ways to fix this but they all use express. I am trying to stay away from express because i am in a sand-boxed host and there is not a way to add express.So i have a major problem. I need to get data f