在 Express.js 中计算时如何发送多个响应？

Question

I'm trying to send multiple responses to client while computing. Here is my example:

app.get("/test", (req, res) => {
    console.log('test');
    
    setTimeout(() => {
        res.write('Yep');
        setTimeout(() => {
            res.write('Yep');
            setTimeout(() => {
                res.write('Yep');
                setTimeout(() => {
                    res.write('Yep');
                    setTimeout(() => {
                        res.write('Yep');
                        setTimeout(() => {
                            res.end();
                        }, 1000);
                    }, 1000);
                }, 1000);
            }, 1000);
        }, 1000);
    }, 1000);
    
    
});

I want to get the response in every seconds. But my code works and it send response on end() . Is there any way to do it?

Answer 1

You can't send more than one response to a request, that's not how HTTP works. You can send headers more than once (see this answer ), but only one response body. You could use websockets or build logic into the client to hit an endpoint every X seconds, if you need functionality like that.