19 Jul 2022 Networking

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How to Poll a URL with Watch and Curl in Linux

Polling a URL with `watch` and `curl` in Linux requires a single terminal command: `watch -n 5 curl -s https://example.com`. The `-n 5` flag tells `watch` to repeat the `curl` request every five seconds, while `-s` runs curl in silent mode. This combination lets you monitor URL responses in real time without writing any scripts.

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1.
What it is
The Linux Watch command combined with Curl can repeatedly poll a URL at regular intervals to monitor for changes.
2.
Why it matters
This is particularly useful for testing deployments like blue/green switches to ensure there's no downtime during server cutover operations.
3.
Key takeaway
Watch + Curl provides a simple way to continuously monitor URL availability during critical deployment operations.

If you want to quickly test a URL for changes, then the linux Watch command couple with Curl is a really simple way to hit a URL every n seconds (I use this for blue/green deployment testing to make sure there is no downtime when cutting over):

# Install watch command using homebrew
brew install watch
# Poll andrewbaker.ninja every 1 seconds
watch -n 1 curl andrewbaker.ninja

👁14viewsHow to Poll a URL with Watch and Curl in Linux

👁14views
How to Poll a URL with Watch and Curl in Linux