HTTP / Website Monitor

Monitor any website or endpoint and get alerted when it goes down.

Overview

HTTP monitors check your website by sending a HEAD request to your URL at regular intervals. If the response is healthy, your site is marked as UP. If the request times out, returns an error status code, or fails to connect, it is marked as DOWN.

Creating a Monitor

  1. Click Add Monitor in the dashboard.
  2. Enter the full URL, including the protocol (e.g. https://example.com). Both http:// and https:// are supported.
  3. Optionally set a friendly name. If left blank, the URL is used as the display name.
  4. Select a check interval.
  5. Choose your alert channels (email, SMS, phone, Slack).
  6. Optionally assign the monitor to a status page.
Adding a new HTTP monitor

Check Intervals

The check interval controls how often Notifier sends a request to your URL. Faster intervals detect downtime sooner.

Interval Available On
30 seconds Team, Enterprise
1 minute Solo, Team, Enterprise
5 minutes (default) All plans
30 minutes All plans
1 hour All plans
12 hours All plans
24 hours All plans
Selecting a check interval

How Checks Work

Each check follows this process:

  1. Notifier sends an HTTP HEAD request to your URL.
  2. The request has a 25 second timeout.
  3. Redirects (301, 302) are followed automatically.
  4. The response status code determines UP or DOWN status.
  5. Response time is recorded in milliseconds.

Status Code Rules

  • 200, 403, 405 = UP
  • All other status codes = DOWN
  • SSL errors, timeouts, DNS failures, connection refused = DOWN

Why 403 and 405? Some servers block HEAD requests or return 403 for automated traffic. These responses still confirm the server is running and reachable, so Notifier treats them as UP.

Status Transitions

When a monitor's status changes, Notifier takes action automatically:

UP → DOWN

  • A new incident is created.
  • Downtime alerts are sent to all configured channels.
  • The monitor shows a down_since timestamp.

DOWN → UP

  • The incident is resolved automatically.
  • Recovery alerts are sent to all configured channels.
  • The monitor shows an up_since timestamp.

Response Time Tracking

Every successful check records the response time in milliseconds. If the check fails (timeout, connection error), the response time is recorded as null.

You can view response time charts on the monitor detail page. These charts help you spot performance degradation before it becomes a full outage.

Monitor detail page showing uptime history and response times

Uptime Statistics

Notifier calculates an uptime percentage from your monitor's check history. This percentage is visible on the monitor detail page and on any status page that includes the monitor.

Screenshot needed: Monitor detail page showing uptime percentage badge and statistics summary

Managing Monitors

From the monitor detail page you can:

  • Edit the URL, name, check interval, or alert settings.
  • Pause the monitor. Paused monitors are not checked and will not trigger alerts. Resume at any time.
  • Delete the monitor. This removes all associated check history and incidents. This action cannot be undone.
Screenshot needed: Monitor detail page showing Edit, Pause, and Delete action buttons
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