axios: Requests with timeout still hand indefinitely

I have w project where I make tens of thousands of requests to a backend service, scraping some API. I don’t control the backend. To make the process fast, I post the requests in chunks, in parallel.

Sometimes, though, the backend just hangs indefinitely on a request. For that I’d like to have a timeout and just resend new request. Here is the code that I use for that purpose (I’m using the ES7 async/await functionality):

while(true) {
    try {
        let response = await axios.get(url, {timeout: timeout});
        return response.data;
    } catch (e) {
        if (!silent) {
            console.log(`Exception caught: ${JSON.stringify(e)}`);
        }
    }
}

The problem is, even with the timeout settings some of the requests above hang indefinitely - by average 1 per 3000.

To check if the problem is with my code, or with the library I’ve implemented similar functionality using superagent:

while(true) {
    try {
        let promise = new Promise((resolve, reject) => {
            superagent.get(url).timeout(timeout).end((error, response) => {
                if (error) {
                    reject(error);
                } else {
                    resolve(response);
                }
            })
        });
        let response = await promise;
        return response.body;
    } catch (e) {
        if (!silent) {
            console.log(`Exception caught: ${JSON.stringify(e)}`);
        }
    }
}

And the above code works as expected.