User-Agent Reduction Origin Deprecation Trial Demo Site

This demo demonstrates the User-Agent request header containing the desired (either reduced or full) user agent string in the presence of a valid UA Reduction 📖 Deprecation Origin Trial token for all subsequent requests to the site.

[Request] Request User-Agent:

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

[Response] Server asked for:

Accept-CH: 
Origin-Trial:

[Subsequent Request] Client sent:

[…]

[For comparison] Subsequent Request User-Agent:

[…]

Server opt-in origin trials:

What are those origin trials?

User-Agent Reduction Origin Trial: User-Agent Reduction is an effort within Chromium to minimize passive fingerprinting by reducing the entropy in the User-Agent request header and the Navigator JavaScript APIs (`navigator.userAgent`, `navigator.platform`).
User-Agent Reduction Deprecation Origin Trial: User-Agent Reduction Deprecation is an effort within Chromium to allow sites that are not yet ready for the reduced UA string to get the full User Agent string exposed in HTTP requests and in navigator.userAgent, navigator.appVersion, and navigator.platform through a deprecation origin trial.