ua-tracer by Paul Kinlan

trace 2a4CWRHJ

ua-tracer

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

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Trace 2a4CWRHJ

First seen: 2026-07-03 05:04:31.218 UTC
User-Agent: HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0
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
2026-07-03 05:04:31.218 UTC +0 ms homepage GET HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-14f1ebdb68f6f925acd9ce8659ddd78d-3d8c5a239160b547-01",
  "tracestate": "",
  "user-agent": "HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-14f1ebdb68f6f925acd9ce8659ddd78d-4c563f962f95da22-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 05:04:32.521 UTC +1303 ms Open Graph image GET HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=2a4CWRHJ",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-64df3a1cfe3f4b3898e131343e801f7f-54aeebcafe160de6-01",
  "tracestate": "",
  "user-agent": "HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-64df3a1cfe3f4b3898e131343e801f7f-f2c51b9cbebc3bc1-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 05:06:28.002 UTC +116784 ms Open Graph image GET HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=2a4CWRHJ",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-8a88e9bdf2e427f66b053299e5ba373c-289b5ed926992125-01",
  "tracestate": "",
  "user-agent": "HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-8a88e9bdf2e427f66b053299e5ba373c-fe9f64040904e5c3-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 07:26:50.627 UTC +8539409 ms Open Graph image GET HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=2a4CWRHJ",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-cff6a1dd7e7bbadde1a515b3620e691d-617e858fbda3066d-01",
  "tracestate": "",
  "user-agent": "HackerNews/1566 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-cff6a1dd7e7bbadde1a515b3620e691d-d4981446afa62247-01",
  "x-deno-userspace-tracestate": ""
}