ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace 402LH31E

First seen: 2026-07-03 09:09:11.266 UTC
User-Agent: HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
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 09:09:11.266 UTC +0 ms homepage GET HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "nl-NL,nl;q=0.9",
  "host": "uatracer.com",
  "traceparent": "00-3a4e982d688eca7b0402885c5d8675d3-d85376b016dc3694-01",
  "tracestate": "",
  "user-agent": "HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-03 09:09:13.313 UTC +2047 ms Open Graph image GET HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "nl-NL,nl;q=0.9",
  "cookie": "ua-tracer-trace=402LH31E",
  "host": "uatracer.com",
  "traceparent": "00-6e624266a78c3196a55b94c63edd2cd0-65a3c5c912da806b-01",
  "tracestate": "",
  "user-agent": "HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}