營運

Alert on HTTP Status by SMS

Check a website every five minutes and send an SMS when its final HTTP status is not 200.

Check a website every five minutes and send an SMS when its HTTP status is not 200.

Setup

Set the HTTP or HTTPS URL in Prepare the HTTP target in Open Flow or HTTP Request in n8n. Use an endpoint you are authorized to monitor. Connect Twilio and set a valid sender and recipient in Send the SMS alert or Twilio. Enable one format.

Behavior

Every five minutes, the workflow makes an HTTP GET, follows up to 21 redirects, and sends the text Service Down by SMS if the final response status is anything other than 200. A final 200 sends nothing. Open Flow runs on UTC minute boundaries; n8n chooses a fixed second when its schedule is registered. Both formats use UTC.

A network or DNS failure, invalid redirect, redirect limit or request timeout stops the run without an SMS. Open Flow stops without an SMS if the response exceeds 4 MiB. Each request has a 30-second timeout in Open Flow; n8n uses a 30-second request timeout. Repeated non-200 responses send repeated messages. A failed or uncertain SMS may already have been sent; check Twilio before retrying.

Inspiration & credits

Changes to the source

Configure the URL and phone numbers. Allow non-2xx HTTP responses through to the status check so that 4xx and 5xx responses can trigger the source’s intended alert; the original n8n HTTP node stopped before the check on those responses. Network failures still stop the run.
Open Flow follows redirects explicitly to evaluate the final status, and both formats use UTC and a 30-second request timeout.

Adapted from Website status SMS alert in Zie619/n8n-workflows. The source export does not identify a separate template author or license.

The collection’s MIT notice is pinned at a later revision. This is the collection notice at that revision; it does not establish a separate original template author’s license. Our changes are listed above; see repository licensing.

MIT License

Copyright (c) 2025 Zie619

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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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