ua-tracer by Paul Kinlan

trace G16xUlM1

ua-tracer

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

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Trace G16xUlM1

First seen: 2026-07-19 07:50:26.075 UTC
User-Agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
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
2026-07-19 07:50:26.075 UTC +0 ms homepage GET Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
request headers (10) 
{
  "accept": "text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml",
  "accept-encoding": "gzip,deflate",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-0d210326cfd2637359a641abd6a3cc52-81aba62f2fb56ebc-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-0d210326cfd2637359a641abd6a3cc52-31c8ccce7f64c139-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-20 22:00:42.733 UTC +137416658 ms iframe document GET Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
request headers (10) 
{
  "accept": "text/html, application/rss+xml, application/atom+xml, text/xml, text/rss+xml, application/xhtml+xml",
  "accept-encoding": "gzip,deflate",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-f1f2251c8cf2a48ad62eaf56e080f247-25f1980ba463a137-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-f1f2251c8cf2a48ad62eaf56e080f247-3a59b60bc51f0a8b-01",
  "x-deno-userspace-tracestate": ""
}