ua-tracer by Paul Kinlan

trace ymMBWfor

ua-tracer

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

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Trace ymMBWfor

First seen: 2026-07-21 04:56:13.471 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
2026-07-21 04:56:13.471 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": "00-809231b7873df655f602ce5d0f6fd22d-68c5f62648cd2ce9-01",
  "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": "00-809231b7873df655f602ce5d0f6fd22d-7dcca89a06393a85-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 03:01:21.252 UTC +511507781 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-a6f163dc4972ca376f12072d3e6235a7-02b8dd2e4b0f70e0-01",
  "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-a6f163dc4972ca376f12072d3e6235a7-f5468e5e98a96da6-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 03:01:21.287 UTC +511507816 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": "00-963066ddd748a277b3f866c4d738b058-90f3e957535c170c-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": "00-963066ddd748a277b3f866c4d738b058-740c4b7f1adf9eb3-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 04:06:40.405 UTC +515426934 ms apple-touch-icon 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-bbf86464942452b7e2b6e3660dda4d21-1d6259c113cbbc9a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}