ua-tracer by Paul Kinlan

trace jEJD5LxN

ua-tracer

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

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Trace jEJD5LxN

First seen: 2026-08-26 22:26:05.544 UTC
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
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
2026-08-26 22:26:05.544 UTC +0 ms homepage GET Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "baggage": "sentry-trace_id=9290d2380ca146a1827de08a9be10694,sentry-environment=production,sentry-release=ef6003e699168c14a1f81f162f3893138fef92d5,sentry-public_key=23937f3f7258dcfbab13359d58e4aef6,sentry-org_id=108499",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "sentry-trace": "9290d2380ca146a1827de08a9be10694-85f46806d18f8497",
  "traceparent": "00-73e5b18d328f138c0051c8b16fef11aa-d8857633a135a10b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-sampled": "0",
  "x-b3-spanid": "e6f6475e985dbea0",
  "x-b3-traceid": "a6b0a71fd6e4847a118981a64334c375"
}
2026-08-26 22:26:07.757 UTC +2213 ms favicon GET Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "baggage": "sentry-trace_id=ba7758a9486e471489d21b5776163fd8,sentry-environment=production,sentry-release=ef6003e699168c14a1f81f162f3893138fef92d5,sentry-public_key=23937f3f7258dcfbab13359d58e4aef6,sentry-org_id=108499",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "sentry-trace": "ba7758a9486e471489d21b5776163fd8-bba828c2b79561b8",
  "traceparent": "00-6ae609c0a4845fff22a291308d464229-13e88fba8f399bd9-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-sampled": "0",
  "x-b3-spanid": "ccf2da8300a434c8",
  "x-b3-traceid": "451c84ce86ace3716b1d09b58208cfe4",
  "x-deno-userspace-traceparent": "00-6ae609c0a4845fff22a291308d464229-da84b69053679d9b-01",
  "x-deno-userspace-tracestate": ""
}