SiteSignal Public API Endpoint Sanity Check

Use this endpoint when you need a lightweight, unauthenticated probe of a single public API URL — especially when you want to combine status checking, redirect detection, response fingerprinting, and optional text assertion in a single call. Prefer this over a full monitoring service when you just need a one-off or pre-flight check without setting up recurring jobs or authentication flows.

• Target URL is unreachable or DNS fails — returns error with connection failure detail
• Target URL returns an unexpected status code — reports actual vs expected status
• Expected text string not found in response body — assertion failure indicated in result
• Redirect loop or too many redirects — reported in redirect chain with truncation
• Target URL is not a valid URI — input validation error before request is made
• Timeout on slow or unresponsive endpoints — returns timeout error