{ "title": "What a headless browser exposes: signals measured per configuration", "publisher": "proxy.wiki", "url": "https://proxy.wiki/research/bot-detection-signals-measured/", "license": "CC BY 4.0", "collected_on": "2026-10-21", "sample": { "configurations": 16, "runs_per_configuration": 5, "page_loads_total": 80, "page_loads_ok": 80 }, "environment": { "os": "macOS 26.6.2 (25G83), Apple M5, 10 cores", "node": "24.2.0", "playwright": "1.62.1", "puppeteer": "23.4.0", "google_chrome": "155.0.8059.85", "chrome_for_testing_and_headless_shell_used_with_playwright": "148.0.7778.96 (Playwright build 1223; Playwright 1.62.1 pins build 1234, 151.0.7922.34, which was not installed)", "chrome_for_testing_used_with_puppeteer": "129.0.6668.58 (the build Puppeteer 23.4.0 pins)" }, "method": "A Node http server on 127.0.0.1 served one HTML page that reads the listed properties and POSTs them back. Each configuration launched a fresh browser process per run and loaded the page once. Request headers are req.rawHeaders of the navigation GET, in received order. No third-party page was loaded.", "null_means": "No value was captured. It never means zero.", "redactions": "Time zone replaced by a match-the-control flag. File paths in browser command lines reduced to basenames; --user-data-dir removed. Window globals reduced to the difference from the control.", "summary": [ { "config": "control-chrome-headed", "label": "Google Chrome, headed, launched with no automation (control)", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "control-chrome-headed", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": false, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": false, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 1200, "outer_height": 824, "inner_width": 1200, "inner_height": 737, "outer_minus_inner_height": 87, "screen_width": 1470, "screen_height": 956, "screen_color_depth": 30, "device_pixel_ratio": 2, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 100, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "chrome-cli-headless", "label": "Google Chrome --headless, no automation library", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "chrome-cli-headless", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": false, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": true, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 756, "outer_height": 556, "inner_width": 756, "inner_height": 469, "outer_minus_inner_height": 87, "screen_width": 800, "screen_height": 600, "screen_color_depth": 24, "device_pixel_ratio": 1, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 150, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "iso-headless-enable-automation", "label": "Isolation: Google Chrome --headless --enable-automation, no library", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "iso-headless-enable-automation", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": true, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": true, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 756, "outer_height": 556, "inner_width": 756, "inner_height": 413, "outer_minus_inner_height": 143, "screen_width": 800, "screen_height": 600, "screen_color_depth": 24, "device_pixel_ratio": 1, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 50, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "iso-headless-port0", "label": "Isolation: Google Chrome --headless --remote-debugging-port=0, nothing attached", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "iso-headless-port0", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": true, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": true, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 756, "outer_height": 556, "inner_width": 756, "inner_height": 469, "outer_minus_inner_height": 87, "screen_width": 800, "screen_height": 600, "screen_color_depth": 24, "device_pixel_ratio": 1, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 50, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "iso-headless-port-fixed", "label": "Isolation: Google Chrome --headless --remote-debugging-port=, nothing attached", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "iso-headless-port-fixed", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": false, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": true, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 756, "outer_height": 556, "inner_width": 756, "inner_height": 469, "outer_minus_inner_height": 87, "screen_width": 800, "screen_height": 600, "screen_color_depth": 24, "device_pixel_ratio": 1, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 100, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "iso-headless-pipe", "label": "Isolation: Google Chrome --headless --remote-debugging-pipe, nothing sent on the pipe", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [ "connection_rtt" ], "values_run_1": { "config": "iso-headless-pipe", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": true, "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/155.0.0.0 Safari/537.36", "ua_contains_HeadlessChrome": true, "ua_full_version_unreduced": false, "uad_brands": "Google Chrome;v=155 | Chromium;v=155 | Not(A:Brand;v=24", "uad_brands_contain_HeadlessChrome": false, "uad_brands_contain_Google_Chrome": true, "uad_full_version_list": "Google Chrome;v=155.0.8059.85 | Chromium;v=155.0.8059.85 | Not(A:Brand;v=24.0.0.0", "header_sec_ch_ua": "\"Google Chrome\";v=\"155\", \"Chromium\";v=\"155\", \"Not(A:Brand\";v=\"24\"", "header_user_agent_matches_navigator": true, "header_accept_language": "en-GB,en-US;q=0.9,en;q=0.8", "header_accept_language_position": 14, "header_count": 14, "header_order": "Host, Connection, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, Upgrade-Insecure-Requests, User-Agent, Accept, Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-User, Sec-Fetch-Dest, Accept-Encoding, Accept-Language", "languages": "en-GB | en-US | en", "plugins_length": 5, "mimetypes_length": 2, "pdf_viewer_enabled": true, "webgl_available": true, "webgl_unmasked_vendor": "Google Inc. (Apple)", "webgl_unmasked_renderer": "ANGLE (Apple, ANGLE Metal Renderer: Apple M5, Unspecified Version)", "webgl2_available": true, "notification_permission": "default", "permissions_query_notifications": "prompt", "notification_vs_permissions_consistent": true, "perm_geolocation": "prompt", "perm_camera": "prompt", "perm_microphone": "prompt", "window_chrome_type": "object", "window_chrome_keys": "app | csi | loadTimes", "outer_width": 756, "outer_height": 556, "inner_width": 756, "inner_height": 469, "outer_minus_inner_height": 87, "screen_width": 800, "screen_height": 600, "screen_color_depth": 24, "device_pixel_ratio": 1, "has_focus": true, "visibility_state": "visible", "media_hover": "hover", "media_pointer": "fine", "media_devices_audioinput": 1, "media_devices_audiooutput": 1, "media_devices_videoinput": 1, "speech_voices": 19, "hardware_concurrency": 10, "device_memory": 16, "connection_rtt": 50, "canvas_sha256_16": "4af6377f202aee69", "cdp_console_stack_getter_fired": false, "timezone_matches_control": true, "intl_locale": "en-GB", "globals_not_in_control": "", "globals_missing_vs_control": "" } }, { "config": "iso-shell-bare", "label": "Isolation: chrome-headless-shell 148 launched with only a URL, no library", "runs": 5, "runs_ok": 5, "fields_that_varied_between_runs": [], "values_run_1": { "config": "iso-shell-bare", "run_index": 1, "ok": true, "library": "none", "browser_version_reported_by_library": null, "navigator_webdriver": true, "user_agent": "Mozilla/5.0 (Macintosh; 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