User-Agent Reduction Origin Deprecation Trial Demo Site

This demo ddemonstrates the desired (either reduced or full) user agent string values returned by the navigator.userAgent and navigator.platform JavaScript getters in the presence of a UA Reduction 📖 Deprecation Origin Trial token.

[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:

[JavaScript] navigator.userAgent

[…]

[JavaScript] navigator.platform

[…]

Server opt-in origin trials:

What's 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.