ua-tracer by Paul Kinlan

trace uwEpZYns

ua-tracer

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

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Trace uwEpZYns

First seen: 2026-09-21 15:41:38.317 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 15:41:38.317 UTC +0 ms homepage GET Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
request headers (8) 
{
  "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": "00-5dad272e552df950f3fadca027ffdc6c-87cd0b73673b519e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-09-21 15:42:16.940 UTC +38623 ms Twitter card image GET Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-0d1cce6ab5896f96cb6af98a68228b9e-1fb81aee180b2c33-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-0d1cce6ab5896f96cb6af98a68228b9e-15a12a560edc0256-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-21 15:42:26.361 UTC +48044 ms image GET Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-e449f603369a94cbd2cf6e31f38e6d84-c52b06c8909a3a42-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-e449f603369a94cbd2cf6e31f38e6d84-cb21d74f94e3f7e6-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-21 15:44:24.657 UTC +166340 ms font (HTML) 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 (9) 
{
  "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": "00-86e74856c20ac8003edfd30d2c38808b-f30901f870c7d02e-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"
}
2026-09-21 15:46:50.722 UTC +312405 ms iframe document 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": "00-6aa55548ba9c99a5c8b8239111145398-cc4b315e263509bc-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": "00-6aa55548ba9c99a5c8b8239111145398-3f1eb79e5cf3efa2-01",
  "x-deno-userspace-tracestate": ""
}