hdrwtch is a tool that watches for changes in the Last-Modified header of a URL. You can use this to monitor the freshness of a web page, or to trigger an action when a page is updated.
Alerts will be sent to you via Telegram when a probe detects a change in the Last-Modified header. They will be aggregated into reports that you can view at any time.
hdrwtch is free to use for up to 5 probes. For more than 5 probes, you will need to upgrade to a paid plan.
Here are some frequently asked questions about hdrwtch and their answers.
A user configured a probe to watch a URL that you control. This is not a security risk. Please see the “Why is hdrwtch in my logs?” page for more information.