Connection & Server Diagnostics

Live browser and page diagnostics. Response-header values are shown only when the browser makes them available.

Collecting diagnostics…

Browser & connection

Connection

Browser & device

HTTPS & security

This checks browser-visible indicators; it does not inspect the full TLS certificate chain or guarantee that every security header is configured correctly.

Performance

Navigation timing

Timing fields may be zero or unavailable due to browser privacy protections, cache behavior, or cross-origin restrictions.

Page resources

HTTP response & CDN

Response details

Cache & CDN headers

CDN cache headers vary by provider and configuration. “Not exposed” does not necessarily mean the header was absent.

Response headers available to JavaScript

LoadingFetching response headers…

Browsers hide certain response headers from JavaScript, including Content-Encoding, Content-Length, and Set-Cookie. To verify Brotli compression, inspect the response in DevTools → Network or use curl -I -H 'Accept-Encoding: br' https://www.asch.website/.