ua-tracer by Paul Kinlan

ua-tracer

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

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Trace OPIwAxuB

First seen: 2026-06-30 08:54:34.057 UTC
User-Agent: Mozilla/5.0 (X11; Linux i686; U; en; rv:1.8.0) Gecko/20060728 Firefox/1.5.0 Opera 9.23

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
2026-06-30 08:54:34.057 UTC +0 ms homepage GET Mozilla/5.0 (X11; Linux i686; U; en; rv:1.8.0) Gecko/20060728 Firefox/1.5.0 Opera 9.23
request headers (10) 
{
  "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",
  "cache-control": "no-cache",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-022e838255eca692b4d3a90f105545ef-e5c10db8930d88cc-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux i686; U; en; rv:1.8.0) Gecko/20060728 Firefox/1.5.0 Opera 9.23",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}