---
title: "Client hints"
description: "The high-entropy values on three paths at once (JavaScript, HTTP headers and the handshake) and whether they agree."
canonical: "https://scalebrowser.net/check/client-hints"
last_modified: "2026-10-04T12:05:52.000Z"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://scalebrowser.net/llms.txt
> Use this file to discover all available pages before exploring further.

one check

# Client hints on three paths

The same facts travel three ways: JavaScript asks for them, the browser sends them as headers, and the TLS handshake underneath says which engine is really there. Whether all three agree is the part a general fingerprint viewer cannot check.

## What this one page cannot tell you

Which hints a given site actually requests. Only a few are sent unasked; the rest arrive on a second request after the server asks. A blank on the header side here is ordinary and never counted against you.

The interesting part is usually not a single value but the disagreement between two. [The full check](https://scalebrowser.net/check) reads all five layers and shows you where they contradict each other.