ua-tracer
by Paul Kinlan
trace m4FCgUsk
what does a user agent actually fetch, follow & run?
Trace m4FCgUsk
First seen: 2026-09-20 02:43:34.350 UTC
User-Agent: Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0
Bot verification: Not a known bot (no IP-range check applies).
What this user agent did
Directly-referenced assets:
✗ fetched CSS
✓ fetched JS
✗ fetched image
✗ fetched font (HTML)
Document-level link hints:
✓ fetched favicon
✗ fetched apple-touch-icon
✗ fetched web manifest
✗ fetched preload
✓ fetched prefetch
Second-level follows (proves it parsed the linking file):
✗ followed CSS background-image
✗ followed CSS @font-face
✗ followed manifest icon
✗ followed CSS @import
Frames (does it descend into iframes?):
✓ fetched iframe document
✗ descended into iframe (loaded inner image)
Reporting (a report-only CSP is violated by inline styles; reports can arrive via HTTP headers with no JS, or via in-page beacons):
✓ sent a CSP/Reporting report (any path)
✓ delivered via report-uri/Report-To header (no JS)
✓ delivered via in-page beacon (securitypolicyviolation / ReportingObserver)
Social embed (Open Graph / Twitter card images):
✗ fetched og:image
✗ fetched twitter:image
JavaScript execution:
✗ EXECUTED classic JS
✗ EXECUTED ES module
✗ posted client timing
Server-side request waterfall
Every request the server received for this trace, in receive order. +ms is the delta from the
homepage request.
| Received | Δ | Kind | Method | User-Agent |
|---|---|---|---|---|
| 2026-09-20 02:43:34.350 UTC | +0 ms | homepage | GET | Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (11){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"traceparent": "00-cc8df03046f691a53bb99a63f43e89c4-16038432cfeae898-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-cc8df03046f691a53bb99a63f43e89c4-1ba3af28feb7ed55-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-20 02:43:41.566 UTC | +7216 ms | prefetch | GET | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (14){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-purpose": "prefetch",
"traceparent": "00-76dd64f42e6e2a674a7f349d3ddb960a-a090fc73321407eb-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-76dd64f42e6e2a674a7f349d3ddb960a-1507cde488876b2d-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-20 02:43:42.057 UTC | +7707 ms | JS | GET | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (11){
"accept": "*/*",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-fce861c7f9cecf1c8382f626b55ca817-369d0020216aea56-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-09-20 02:43:42.565 UTC | +8215 ms | iframe document | GET | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (14){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-0f6bfd3ea77ba72f086024d5ad570630-6989cd4f9b820fb0-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-0f6bfd3ea77ba72f086024d5ad570630-4c86751b9032bc2e-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-20 02:43:43.341 UTC | +8991 ms | Reporting API report (POST) | POST | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (17){
"accept": "*/*",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"content-length": "2195",
"content-type": "application/json",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-a8ec6b9ed0b9ef7d55656541d0d22b51-9b3ff2a803629f90-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-a8ec6b9ed0b9ef7d55656541d0d22b51-a42ed532afa85783-01",
"x-deno-userspace-tracestate": "",
"x-report-body": "{\"source\":\"ReportingObserver\",\"reports\":[{\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"body\":{\"sourceFile\":\"https://uatracer.com/\",\"lineNumber\":9,\"columnNumber\":0,\"documentURL\":\"https://uatracer.com/\",\"referrer\":\"\",\"blockedURL\":\"inline\",\"effectiveDirective\":\"style-src-elem\",\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"sample\":\"\",\"disposition\":\"report\",\"statusCode\":200}},{\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"body\":{\"sourceFile\":\"https://uatracer.com/\",\"lineNumber\":243,\"columnNumber\":0,\"documentURL\":\"https://uatracer.com/\",\"referrer\":\"\",\"blockedURL\":\"inline\",\"effectiveDirective\":\"style-src-attr\",\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"sample\":\"\",\"disposition\":\"report\",\"statusCode\":200}},{\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"body\":{\"sourceFile\":\"https://uatracer.com/\",\"lineNumber\":247,\"columnNumber\":0,\"documentURL\":\"https://uatracer.com/\",\"referrer\":\"\",\"blockedURL\":\"inline\",\"effectiveDirective\":\"style-src-attr\",\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"sample\":\"\",\"disposition\":\"report\",\"statusCode\":200}},{\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"body\":{\"sourceFile\":\"https://uatracer.com/\",\"lineNumber\":755,\"columnNumber\":0,\"documentURL\":\"https://uatracer.com/\",\"referrer\":\"\",\"blockedURL\":\"inline\",\"effectiveDirective\":\"style-src-attr\",\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"sample\":\"\",\"disposition\":\"report\",\"statusCode\":200}},{\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"body\":{\"sourceFile\":\"https://uatracer.com/r/m4FCgUsk/7W1dk5wx/main.js\",\"lineNumber\":45,\"columnNumber\":11,\"documentURL\":\"https://uatracer.com/\",\"referrer\":\"\",\"blockedURL\":\"inline\",\"effectiveDirective\":\"style-src-attr\",\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"sample\":\"\",\"disposition\":\"report\",\"statusCode\":200}}],\"ua\":\"Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0\"}"
}
|
||||
| 2026-09-20 02:43:43.842 UTC | +9492 ms | CSP violation report (POST) | POST | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (17){
"accept": "*/*",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"content-length": "402",
"content-type": "application/json",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-9eb6b7bafb2e796441cbf1ed82e72c8e-953cdd5930ed9d72-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-9eb6b7bafb2e796441cbf1ed82e72c8e-4eaa03a024431011-01",
"x-deno-userspace-tracestate": "",
"x-report-body": "{\"source\":\"securitypolicyviolation\",\"violatedDirective\":\"style-src-attr\",\"effectiveDirective\":\"style-src-attr\",\"blockedURI\":\"inline\",\"documentURI\":\"https://uatracer.com/\",\"disposition\":\"report\",\"lineNumber\":45,\"sourceFile\":\"https://uatracer.com/r/m4FCgUsk/7W1dk5wx/main.js\",\"ua\":\"Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0\"}"
}
|
||||
| 2026-09-20 02:43:46.510 UTC | +12160 ms | Reporting API report (POST) | POST | Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36 |
request headers (15){
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "ru,en;q=0.9",
"content-length": "2733",
"content-type": "application/reports+json",
"cookie": "ua-tracer-trace=m4FCgUsk",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"priority": "u=4, i",
"traceparent": "00-940079d2c4dfcabf1d559e8948219e2f-c824bb1dc088d73b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36",
"via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-940079d2c4dfcabf1d559e8948219e2f-8b9e5bc02716eec5-01",
"x-deno-userspace-tracestate": "",
"x-report-body": "[{\"age\":5403,\"body\":{\"blockedURL\":\"inline\",\"disposition\":\"report\",\"documentURL\":\"https://uatracer.com/\",\"effectiveDirective\":\"style-src-attr\",\"lineNumber\":247,\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"referrer\":\"\",\"sample\":\"\",\"sourceFile\":\"https://uatracer.com/\",\"statusCode\":200},\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"user_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36\"},{\"age\":5403,\"body\":{\"blockedURL\":\"inline\",\"disposition\":\"report\",\"documentURL\":\"https://uatracer.com/\",\"effectiveDirective\":\"style-src-attr\",\"lineNumber\":243,\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"referrer\":\"\",\"sample\":\"\",\"sourceFile\":\"https://uatracer.com/\",\"statusCode\":200},\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"user_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36\"},{\"age\":3681,\"body\":{\"blockedURL\":\"inline\",\"columnNumber\":11,\"disposition\":\"report\",\"documentURL\":\"https://uatracer.com/\",\"effectiveDirective\":\"style-src-attr\",\"lineNumber\":45,\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"referrer\":\"\",\"sample\":\"\",\"sourceFile\":\"https://uatracer.com/r/m4FCgUsk/7W1dk5wx/main.js\",\"statusCode\":200},\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"user_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36\"},{\"age\":5396,\"body\":{\"blockedURL\":\"inline\",\"disposition\":\"report\",\"documentURL\":\"https://uatracer.com/\",\"effectiveDirective\":\"style-src-attr\",\"lineNumber\":755,\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"referrer\":\"\",\"sample\":\"\",\"sourceFile\":\"https://uatracer.com/\",\"statusCode\":200},\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"user_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36\"},{\"age\":5405,\"body\":{\"blockedURL\":\"inline\",\"disposition\":\"report\",\"documentURL\":\"https://uatracer.com/\",\"effectiveDirective\":\"style-src-elem\",\"lineNumber\":9,\"originalPolicy\":\"style-src 'self'; report-uri /r/m4FCgUsk/7W1dk5wx/csp-report; report-to ua-tracer\",\"referrer\":\"\",\"sample\":\"\",\"sourceFile\":\"https://uatracer.com/\",\"statusCode\":200},\"type\":\"csp-violation\",\"url\":\"https://uatracer.com/\",\"user_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36\"}]"
}
|
||||
| 2026-09-20 02:43:46.749 UTC | +12399 ms | favicon | GET | Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip,deflate",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=m4FCgUsk",
"from": "support@search.yandex.ru",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-51477cb63bc7fab5989573e1eda9298c-3cb2d8908e40bcf2-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; YandexRenderResourcesBot/1.0; +http://yandex.com/bots) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-51477cb63bc7fab5989573e1eda9298c-e1754f4aaf6bf6b9-01",
"x-deno-userspace-tracestate": ""
}
|
||||