ua-tracer by Paul Kinlan

ua-tracer

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

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Trace XqinptHh

First seen: 2026-06-24 11:00:28.629 UTC
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:124.0) Gecko/20100101 Firefox/124.0

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
2026-06-24 11:00:28.629 UTC +0 ms homepage GET Mozilla/5.0 (X11; Linux i686; rv:124.0) Gecko/20100101 Firefox/124.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-a7a7bf0cc7323008d1c04891678f578c-319af7953efbecab-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux i686; rv:124.0) Gecko/20100101 Firefox/124.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-a7a7bf0cc7323008d1c04891678f578c-7f49ee0a3733c051-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-24 11:00:29.279 UTC +650 ms web app manifest GET Mozilla/5.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-2c9835b99206ad3164dd7c6b74b27b1b-7e0e2518a20fb822-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-2c9835b99206ad3164dd7c6b74b27b1b-e070455cd00f485d-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-24 11:00:29.280 UTC +651 ms ES module GET Mozilla/5.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-334c4418e1211076e97ebfc9da6bb605-80699cab8e5ccb1b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-334c4418e1211076e97ebfc9da6bb605-243248591f760e35-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-24 11:00:29.280 UTC +651 ms JS GET Mozilla/5.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-5f414ebd8101f5f971328affc936f1f2-f21483e8d842e67c-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-5f414ebd8101f5f971328affc936f1f2-51e3bcb739957405-01",
  "x-deno-userspace-tracestate": ""
}