ua-tracer by Paul Kinlan

ua-tracer

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

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Trace FaVfb6gE

First seen: 2026-06-22 20:01:44.836 UTC
User-Agent: Reeder/260600.02 CFNetwork/3886.100.1 Darwin/27.0.0

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
2026-06-22 20:01:44.836 UTC +0 ms homepage GET Reeder/260600.02 CFNetwork/3886.100.1 Darwin/27.0.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-GB,en;q=0.9",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "priority": "u=3, i",
  "traceparent": "00-876c5f19a8363ba985a50e7ee4877618-0c44d029c9a12de6-01",
  "tracestate": "",
  "user-agent": "Reeder/260600.02 CFNetwork/3886.100.1 Darwin/27.0.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-06-22 20:01:45.436 UTC +600 ms apple-touch-icon GET Reeder/260600.02 CFNetwork/3886.100.1 Darwin/27.0.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-GB,en;q=0.9",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "priority": "u=3, i",
  "traceparent": "00-6d445d8d0fbb33916f5a15a43a43e1ba-ca9e95eacbe42be6-01",
  "tracestate": "",
  "user-agent": "Reeder/260600.02 CFNetwork/3886.100.1 Darwin/27.0.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}