Security Headers Check – Client-Side HTTP Response Inspector | STS Privacy Tools

November 12, 2025

Security Headers Check

Tools on this domain use client-side only JavaScript. STS never sees, stores, or processes your URLs.
Note: Because this runs entirely in your browser, sites with strict CORS policies may block header access. For deeper analysis, consider external services like securityheaders.com. Enter website URL:

Requested URL —

HTTP Status —

CORS / Access —