fetch-hedged.js

// https://medium.com/star-gazers/improving-tail-latency-with-request-hedging-700c77cabeda
async function fetchHedged(url, { timeout }) {
    let res;
    try {
        res = await fetch(url, {
            signal: AbortSignal.timeout(timeout)
        })
    } catch (error) {
        if (error && error.code !== 'ABORT_ERR') {
            throw error
        }
        res = await fetch(url, {
            signal: AbortSignal.timeout(timeout)
        })
    }
    return res
}

(async() => {
    const res = await fetchHedged(
        "https://jsonplaceholder.typicode.com/todos/1",
        { timeout: 50 }
    )
})()