Compression response test

Brotli Checker

Send a safe public GET request that asks for Brotli and inspect the returned Content-Encoding, Vary, cache, and status headers.

Only the public URL you enter is requested. Private and unsafe network destinations are rejected before a connection is made.

Features

Brotli Checker Features

Real Brotli negotiation

Uses a normal GET request with Accept-Encoding: br instead of relying on an unreliable HEAD-only test.

Response header details

View Content-Encoding, Content-Type, Vary, cache controls, final URL, and HTTP status.

Redirect-aware result

Limited redirects are followed safely and the final checked URL is reported.

Resource-specific clarity

The result explains the selected response, not an absolute verdict for every page on a domain.

Performance troubleshooting

Use the result to help investigate whether a public HTML response offers Brotli.

Protected network lookup

URL validation and pinned public DNS resolution prevent access to local or private services.

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Frequently Asked Questions

It means the checked response returned Content-Encoding: br after this tool requested Brotli compression.

Compression can vary by page type, cache state, CDN rule, browser request header, and server configuration.

Some servers negotiate compression differently for HEAD requests. This tool uses a small real GET request to better reflect normal delivery.

Yes. The selected resource may not be compressed or its server/CDN may choose another encoding for this particular request.

No. Local, private, reserved, credentialed, and non-standard-port targets are rejected for security.

No. It detects the returned encoding and related headers. It does not download a full page to calculate size savings.