ua-tracer by Paul Kinlan

trace 4Jqzq91B

ua-tracer

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

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Trace 4Jqzq91B

First seen: 2026-09-22 20:26:40.919 UTC
User-Agent: Mozilla/5.0 Firefox/143.0
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
2026-09-22 20:26:40.919 UTC +0 ms homepage GET Mozilla/5.0 Firefox/143.0
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "traceparent": "00-bebe0490ebded033d70cf9748fd08faa-27cf48d0723f86ae-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-bebe0490ebded033d70cf9748fd08faa-45400fdbf10a2cc5-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-22 20:26:42.375 UTC +1456 ms CSS GET Mozilla/5.0 Firefox/143.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/",
  "traceparent": "00-1688ca389178bdd9b670f13d986159be-1a5a394155761a38-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-1688ca389178bdd9b670f13d986159be-0235f9797e2ddc4c-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-22 20:26:42.690 UTC +1771 ms CSS @import (nested stylesheet) GET Mozilla/5.0 Firefox/143.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/",
  "traceparent": "00-1b8486a86536223231269bffe7869163-4b648feec3c26c17-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-1b8486a86536223231269bffe7869163-1f4c5bfec1dc7ea3-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-22 20:26:45.922 UTC +5003 ms CSS @font-face GET Mozilla/5.0 Firefox/143.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com",
  "traceparent": "00-46d4916d5c9cba5db00cd36bec0b45d1-2a20fe58d116ef3e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-46d4916d5c9cba5db00cd36bec0b45d1-1fb26c206d4a445b-01",
  "x-deno-userspace-tracestate": ""
}