koaflow.js

function failing() {
    return new Promise((resolve, reject) => {

        setTimeout(function() {
            reject(new Error("failed"));
        },10);

    });
}

function succeeding() {
    return new Promise((resolve, reject) => {

        setTimeout(function() {
            resolve(123);
        }, 10);

    });
}


router.get("/bla",
    function *(next) {
        console.log("1");
        try {
            this.state.bla = yield failing();
            yield next;
            console.log("1 after");
        }
        catch(err) {
            console.log("catch");
            this.throw(err);
        }

    },
    function *(next) {
        console.log("2");
        this.state.blub = yield succeeding();
        yield next;
        console.log("2 after");
    },
    function *() {
        this.body = {a: "b"};
    });