co.es6

import request from "request-promise";
import {readFile, writeFile} from "mz/fs";
import co from "co";

let uri = "http://localhost:8917";

co(function* () {
    let body = yield request.get({uri});
    yield writeFile(__dirname + "/foo", body);
    let contents = yield readFile(__dirname + "/foo");
    yield writeFile(__dirname + "/bar", contents.toString().split("").reverse().join(""));
    let res = yield request({uri, method: "POST"});

    return res;
})
.then(res => console.log("posted file"))
.catch(err => console.error(err.stack));