浏览器隐私预算与指纹防护策略实践

浏览器隐私预算与指纹防护策略实践概述通过最小化指纹面、限制Client Hints与对可识别信号降噪，可降低跨站唯一性与长期跟踪风险。策略基线不曝光不必要的Client Hints对时间、尺寸与采样值进行离散化与降噪请求头与响应头去标识与一致化服务器响应头配置Accept-CH:

Permissions-Policy: geolocation=(), camera=(), microphone=()

Referrer-Policy: strict-origin-when-cross-origin

Cache-Control: no-store

请求去标识function sanitizeHeaders(headers: Record<string, string>): Record<string, string> {

const h: Record<string, string> = {}

const allow = ["accept", "content-type"]

for (const k of allow) if (headers[k]) h[k] = headers[k]

return h

}

行为降噪function roundTime(ms: number, step: number): number {

return Math.round(ms / step) * step

}

function quantizeSize(w: number, h: number): [number, number] {

const qw = Math.round(w / 16) * 16

const qh = Math.round(h / 16) * 16

return [qw, qh]

}

指纹脚本检测function detectFingerprintApis(code: string): string[] {

const apis = ["CanvasRenderingContext2D", "AudioContext", "WebGLRenderingContext", "navigator.hardwareConcurrency"]

const hit: string[] = []

for (const a of apis) if (code.includes(a)) hit.push(a)

return hit

}

运维要点最小化客户端提示与统一Referrer策略对一致性强的值进行离散化与降噪在CI扫描潜在指纹采集API并进行审计通过最小化与降噪策略，可在不影响功能的前提下显著降低指纹唯一性。