feat: detect headless browsers via missing headers (Playwright/Puppeteer)#8
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feat: detect headless browsers via missing headers (Playwright/Puppeteer)#8
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…ders Adds detectHeadless(req) that scores browser-like requests on 6 signals: - Missing Accept-Language (every real browser sends this) - Missing Sec-Fetch-Mode (all modern browsers) - Missing Sec-CH-UA (Chromium 89+) - Sec-CH-UA contains HeadlessChrome - Missing or bare Accept header - Connection: close (browsers use keep-alive) Score >= 2 with a browser UA = headless-likely. Integration: - classifyRequest(req) promotes browser to headless-likely when detected - trackVisit emits headless_score and headless_likely properties - skipBrowsers: true now captures headless-likely requests (Aider, OpenCode) New exports: detectHeadless, classifyRequest, HeadlessDetection Bumps to v0.7.0. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Detects Playwright-based agents (Aider, OpenCode) that spoof real browser UAs by checking for missing standard headers.
How it works
detectHeadless(req)scores browser-like requests on 6 signals:Accept-LanguageSec-Fetch-ModeSec-CH-UASec-CH-UAcontainsHeadlessChromeAcceptConnection: closeScore >= 2 with a browser UA =
headless-likely.Integration
classifyRequest(req)promotesbrowsertoheadless-likelywhen detectedtrackVisitemitsheadless_scoreandheadless_likelypropertiesskipBrowsers: truenow captures headless-likely requests alongside declared bots and HTTP clientsNew exports
detectHeadless(req)— standalone headless detectionclassifyRequest(req)— full request classification (UA + headers)HeadlessDetectiontypeBumps to v0.7.0. 103 tests pass.