ua-tracer by Paul Kinlan

trace SgS0CRYh

ua-tracer

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

← all traces

Trace SgS0CRYh

First seen: 2026-07-03 04:14:33.788 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
2026-07-03 04:14:33.788 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-a2f3ac8ca6a6d815ab9009e8b1db84ca-01777c2cd3fe87d4-01",
  "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-a2f3ac8ca6a6d815ab9009e8b1db84ca-228e483a231e4c1a-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 04:15:18.171 UTC +44383 ms Open Graph image GET Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "from": "support@search.yandex.ru",
  "host": "uatracer.com",
  "traceparent": "00-973feb47cb20b01d50895301765f5f14-660c4e85427edaae-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-03 04:15:19.876 UTC +46088 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-b5fd3cd918a0a355ca7f0b710f67e78e-09b970b683f5e790-01",
  "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-b5fd3cd918a0a355ca7f0b710f67e78e-a5d9940f6291bb62-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 04:15:21.760 UTC +47972 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": "00-8303c2adcb559c4d4f10b8e7fdaa15ab-16edf7da271c2b48-01",
  "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": "00-8303c2adcb559c4d4f10b8e7fdaa15ab-2b1fbd4dfe7bb50a-01",
  "x-deno-userspace-tracestate": ""
}