ua-tracer by Paul Kinlan

trace PB5Tc2u2

ua-tracer

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

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Trace PB5Tc2u2

First seen: 2026-11-06 12:03:33.186 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
2026-11-06 12:03:33.186 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": "00-0df28c23599fffb6927b8a2d0d98888b-55760859d5fa5d0b-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": "00-0df28c23599fffb6927b8a2d0d98888b-a616d3a4b0e0977e-01",
  "x-deno-userspace-tracestate": ""
}
2026-11-07 19:08:02.836 UTC +111869650 ms iframe document GET Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
request headers (8) 
{
  "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-d20a5d8c0869a9a5eb7c945e9b3880cd-8edc7193c6dafbcd-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"
}