ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace JsQDRNCQ

First seen: 2026-07-03 06:56:29.147 UTC
User-Agent: HackerNews/1569 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 06:56:29.147 UTC +0 ms homepage GET HackerNews/1569 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-GB,en;q=0.9",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-1e0c94f9243658483b367691c2f67d69-1887fa526400f411-01",
  "tracestate": "",
  "user-agent": "HackerNews/1569 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-03 06:56:31.173 UTC +2026 ms Open Graph image GET HackerNews/1569 CFNetwork/3860.600.12 Darwin/25.5.0
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-GB,en;q=0.9",
  "cookie": "ua-tracer-trace=JsQDRNCQ",
  "host": "uatracer.com",
  "priority": "u=3",
  "traceparent": "00-2c9c325c9d8d8c57d8134bc15d3c111c-671dbfdbbe56c9c8-01",
  "tracestate": "",
  "user-agent": "HackerNews/1569 CFNetwork/3860.600.12 Darwin/25.5.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-2c9c325c9d8d8c57d8134bc15d3c111c-def2267a6e3e08f7-01",
  "x-deno-userspace-tracestate": ""
}