ua-tracer by Paul Kinlan

trace nR5NW5sp

ua-tracer

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

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Trace nR5NW5sp

First seen: 2026-11-09 03:59:15.505 UTC
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
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
2026-11-09 03:59:15.505 UTC +0 ms homepage GET Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
request headers (11) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
  "accept-encoding": "gzip, deflate",
  "accept-language": "zh-CN,zh;q=0.9,en;q=0.8",
  "cache-control": "max-age=0",
  "host": "uatracer.com",
  "traceparent": "00-b7af3cf4dad1ffd077632830387ab547-9de4afb2d122533a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-b7af3cf4dad1ffd077632830387ab547-9c1ee39aa54aca0b-01",
  "x-deno-userspace-tracestate": ""
}
2026-11-09 03:59:20.744 UTC +5239 ms favicon GET Mozilla/5.0 (Windows NT 10.0; WOW64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.5666.197 Safari/537.36
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-197c1e512ab141dda9d59a1b3de48a2c-31e1c8e9d834663a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Windows NT 10.0; WOW64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.5666.197 Safari/537.36",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-197c1e512ab141dda9d59a1b3de48a2c-c6615f40dbfcee1b-01",
  "x-deno-userspace-tracestate": ""
}