ua-tracer by Paul Kinlan

trace 1bVi9jKv

ua-tracer

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

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Trace 1bVi9jKv

First seen: 2026-07-03 04:49:38.169 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 04:49:38.169 UTC +0 ms homepage GET HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-CA,en-US;q=0.9,en;q=0.8",
  "host": "uatracer.com",
  "traceparent": "00-308333ad3ee1d841dc259cf4b60a8389-620a0298521ed5bb-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",
  "x-deno-userspace-traceparent": "00-308333ad3ee1d841dc259cf4b60a8389-a164775c6533eace-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 04:49:40.273 UTC +2104 ms Open Graph image GET HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-CA,en-US;q=0.9,en;q=0.8",
  "cookie": "ua-tracer-trace=1bVi9jKv",
  "host": "uatracer.com",
  "traceparent": "00-5aec8b5a2e1f6ceebc5c2752e7f5406a-3a9afba47c2c28a0-01",
  "tracestate": "",
  "user-agent": "HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-5aec8b5a2e1f6ceebc5c2752e7f5406a-85a2d72508a23e3a-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-03 04:55:15.291 UTC +337122 ms Open Graph image GET HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-CA,en-US;q=0.9,en;q=0.8",
  "cookie": "ua-tracer-trace=1bVi9jKv",
  "host": "uatracer.com",
  "traceparent": "00-746e74678957fb04d645433ac7293cc9-6fe601e99b39da26-01",
  "tracestate": "",
  "user-agent": "HackerNews/1545 CFNetwork/3826.600.41.2.1 Darwin/24.6.0",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-746e74678957fb04d645433ac7293cc9-1b7118f6ad3c004c-01",
  "x-deno-userspace-tracestate": ""
}