How to monitor website uptime and server response time
A 200 status alone is not enough. Good monitoring separates DNS, connection, TLS and application response and also confirms recovery.
Monitoring should detect a problem before users do, yet a weak check can create meaningless alerts or miss a real outage. A home page can respond while login, an API or the database is unavailable.
Define what availability means for this service: valid DNS, a completed TLS handshake, an expected HTTP status and an application response within an acceptable time.
Choose the correct target
Monitor a public website at its canonical HTTPS address and consider a lightweight health endpoint for critical application dependencies. Do not expose secrets or detailed infrastructure diagnostics through that endpoint.
- Check the final URL after redirects.
- Separate the website, API and login page.
- Define an expected status or a small response marker.
- Monitor certificate health separately.
Interpret response time
One slow measurement may come from network routing, a cold start or temporary load. A trend and repeated threshold breaches are more useful. Measure from a consistent location when comparing results over time.
Alert without unnecessary noise
Require a small number of consecutive failures before alerting, without delaying critical incidents too much. Include the target, time, error stage and last result. Send a separate recovery message when the service becomes healthy.
- Choose recipients by service ownership.
- Suppress identical notifications on every check.
- Record incident start and recovery.
- Test the notification channel regularly.
Effective HTTP monitoring
- Monitor the right URL and success condition.
- Separate DNS, TLS, HTTP and application checks.
- Set a response threshold and retry policy.
- Send both failure and recovery notifications.
Put it into practice
Check response time
Measure a server response, review the request status and enable a free email alert for the selected target.
Check response timeFrequently asked questions
How often should a website be checked?
A few minutes is a practical compromise for an ordinary site. Critical systems may need shorter intervals and checks from multiple independent locations.
Does HTTP 200 prove that the application works?
Not always. A server may return a fallback or an error message with status 200. For important functions, verify expected content or a dedicated health check.
Why does monitoring alert while the site looks available?
The cause can be a brief timeout, an IPv6-only problem, TLS, one monitoring location or an overly strict threshold. Per-stage details make this diagnosable.