Inspect any URL and view redirect chains, HTTP headers, response codes, and a safe preview. Enter a URL below or pass it directly via the address bar.
Inspect URLs by making a simple request. Access peek.73.nu/yoururl.com to receive a full inspection page showing the redirect chain, HTTP status codes, response headers, and a safe content preview.
Append ?format=json to any request to get a JSON response with redirect chain data and headers (body excluded for size).
| Param | Description |
|---|---|
url |
URL to inspect. Passed as the URL path or as a query parameter. Required. |
format |
Output format: html (default page) or json (API response). |
To ensure service availability, inspections are rate-limited per IP address. You can make up to 20 requests in quick succession, after which the allowance replenishes at one request every 2 seconds.
All URLs are validated before fetching. Only http:// and https:// schemes are allowed. Private and reserved IP ranges (localhost, 10.x, 172.16-31.x, 192.168.x, 169.254.x, etc.) are blocked to prevent SSRF attacks. Every redirect hop is validated before following. Response size is capped at 10 MB.
The content preview uses two layers of protection. First, all JavaScript, forms, iframes, event handlers, base tags, and dangerous URI schemes (javascript:, data:) are stripped server-side before rendering. Second, the iframe uses an empty sandbox="" attribute with zero permissions. No script execution, no form submission, no navigation, no popups, no same-origin access to cookies or storage.