HTTP Headers Checker

Frequently asked questions

What headers does this show?

The exact HTTP request headers our server received from your browser for this page load — things like User-Agent, Accept-Language, Accept-Encoding and any proxy-related headers.

Why do headers sometimes differ from what my browser sent?

Proxies, CDNs and load balancers can add, rewrite or strip headers in transit (X-Forwarded-For, Via, etc.), so what the server sees isn't always identical to what left your browser.

Can I use this to debug a CDN or proxy configuration?

Yes — comparing the headers here against what you expect your proxy or CDN to forward is a quick way to spot misconfigurations.

Is any of this data stored?

No. The headers are read and displayed for your current request only — nothing is logged against an account or kept afterward.

Do I need to install anything or sign up?

No. It runs entirely in your browser — no software install, no account, no email required.