How can I return datas to Http Request?

The code

console.log("back from network?",res)
didn't print anything.

tp.get("http://www.pur3.co.uk/hello.txt", function (res) {
     console.log("back from network?",res)
      let str = ''; 
      res.on('data', chunk => {
        console.log("chunk",chunk);
        str += chunk;
      });
      res.on('end', () => {
        console.log("result: --->   ", str);
      });
    });

In the Mehtod recv(), I did got datas and retruned them. But where these datas go I really don't know, and how do they go back to http.get response body?

console.log("[recv data]", r)

return r;