ua-tracer by Paul Kinlan

trace 4JtHrOjr

ua-tracer

what does a user agent actually fetch, follow & run?

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Trace 4JtHrOjr

First seen: 2026-09-21 15:42:09.579 UTC
User-Agent: Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
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.

ReceivedΔKindMethodUser-Agent
2026-09-21 15:42:09.579 UTC +0 ms homepage GET Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-1124beba1ef12d78b58ef676068a8c96-6c9bba6676cf5361-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-1124beba1ef12d78b58ef676068a8c96-4a2ab63db1f502fe-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-29 05:14:52.094 UTC +653562515 ms apple-touch-icon GET Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-184340b4dd2aee7569db4fb018e64111-af9054c5eb3b101b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-184340b4dd2aee7569db4fb018e64111-6e3180bf5424f3c1-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-29 05:14:54.785 UTC +653565206 ms favicon GET Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-fd6c15c5cd398c0b91ef7df035b252a9-f21d73bc8a062447-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-fd6c15c5cd398c0b91ef7df035b252a9-a6cd36f4e7580666-01",
  "x-deno-userspace-tracestate": ""
}
2026-10-06 07:11:04.909 UTC +1265335330 ms favicon GET Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-9d89059e9f7ba232e251c51b63db19e2-0071f76ae4fa337b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-10-06 07:11:06.554 UTC +1265336975 ms apple-touch-icon GET Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-211e507b644ba6603679f0dbdb8028f5-d7ae044c06478df3-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-211e507b644ba6603679f0dbdb8028f5-79754cb86f944162-01",
  "x-deno-userspace-tracestate": ""
}