Is It Down for Everyone, or Just You?
Someone on your team says the production site is down. Before you start a full incident response, you need to know: is it actually down, or is it just their network? Their VPN? Their DNS cache?
Enter the URL here and get an external perspective. The check runs from Toolsvu’s server, not from your network. If it shows UP with a 200 status code, the site’s fine — the problem is between your colleague and the server. If it shows DOWN, the site’s genuinely unreachable and it’s time to investigate.
You’ll see the HTTP status code, response time (Time to First Byte in milliseconds), and content type. The tool follows redirects and reports the final status.
Quick Deployment Verification
You just pushed a new version. CI/CD says the deployment succeeded. Before you ping the team channel with “deploy complete,” check the URL yourself. A 200 status with a reasonable response time (under 500ms for a simple page) means the deploy actually worked. A 502 or 503 means your app server didn’t come back up cleanly. Catch it now, not when a customer reports it.
For API deployments, check your health endpoint directly — https://api.example.com/health or whatever path your app uses.
Monitoring External Dependencies
Your app relies on Stripe’s API, a CDN for static assets, and a third-party email service. If any of those go down, your app breaks. Spot-check their endpoints to rule out third-party issues when your app is misbehaving.
What the Status Codes Mean
- 200 — everything’s fine
- 301/302 — redirect (the tool follows these and reports the final destination’s status)
- 403 — forbidden (the server’s up but refusing the request)
- 404 — page not found (server’s up, the specific URL doesn’t exist)
- 500 — internal server error (the app is crashing)
- 502 — bad gateway (the reverse proxy can’t reach the upstream app)
- 503 — service unavailable (usually means the app is overloaded or in maintenance mode)
- Connection timeout — the server isn’t responding at all
Only publicly accessible URLs work here, since the request comes from Toolsvu’s server. Localhost and internal network addresses aren’t reachable.
For inspecting response headers in detail, use the HTTP Headers Analyzer. For SSL certificate problems, the SSL Certificate Checker shows expiration and configuration details. For port-level connectivity checks, the Port Status Checker tests whether a specific port is open.