Laboratory

export default async function handler(req, res) {
    const { url } = req.query;
    const response = await fetch(url);
    const buffer = await response.arrayBuffer();
    res.setHeader('Cache-Control', 'public, max-age=31536000');
    res.setHeader('Content-Type', response.headers.get('content-type'));
    res.send(Buffer.from(buffer));
}

func WorkerPool(jobs <-chan int, results chan<- int) {
    for j := range jobs {
        results <- expensiveOperation(j)
    }
}

func main() {
    jobs := make(chan int, 100)
    results := make(chan int, 100)
    for w := 1; w <= 3; w++ {
        go WorkerPool(jobs, results)
    }
}