ua-tracer by Paul Kinlan

trace qzb2pVDv

ua-tracer

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

← all traces

Trace qzb2pVDv

First seen: 2026-08-30 17:12:57.058 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
2026-08-30 17:12:57.058 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": "00-55017ab5996bc3fa35345c3a48383eff-4a89b9abd9976670-01",
  "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": "00-55017ab5996bc3fa35345c3a48383eff-0818aa275b2b317a-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-01 00:30:41.864 UTC +112664806 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": "00-7b5ef2d81db801f81ae0a3934d657c2d-ff3904bec651b4f1-01",
  "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"
}