Detect if another website is online or not in javascript

Question

Hi I am using Angular and iframe. I would like to detect if the target website is online or not before load it into the iframe. I am currently using the following code

try {
  await this._httpClient.get(url, { observe: 'response' }).toPromise();
} catch (error) {
  return error.status === 200;
}

However, it takes more than 20 seconds to check one website when the website it offline, but quite quick when the website is online. Is there faster way to detect if a target website is online or not? Thank you

Does this answer your question? How to check if site is online with JavaScript? Plus tips on how to make the rest of this function work better — Zze
– Zze, Commented Feb 3, 2020 at 22:26

Joe · Accepted Answer · 2020-02-03 22:24:57Z

1

You can send request for other static small file like simple css file or image file of that site instead of site content.

answered Feb 3, 2020 at 22:24

Joe

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2 Comments

Ben Over a year ago

Hi Romeo, thank you for your suggestion. However, the issue of my code is that when the website is offline, it takes more than 20 seconds to return a timeout, then it will move to check the next website. So not exactly sure how much loading a small static file will help. Actually when the website is online, my code detects much quicker than detecting an offline website.

Joe Over a year ago

If you think so, you can give timeout before sending request.

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