ua-tracer by Paul Kinlan

trace bZkD13lj

ua-tracer

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

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Trace bZkD13lj

First seen: 2026-08-30 14:46:11.607 UTC
User-Agent: facebookexternalhit/1.1
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
2026-08-30 14:46:11.607 UTC +0 ms homepage GET facebookexternalhit/1.1
request headers (9) 
{
  "accept": "text/html,application/xhtml+xml",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-68ca3236394e39a3f0a7c5cd7729a819-d262d307fb73452a-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-08-30 14:46:27.635 UTC +16028 ms Open Graph image GET Firefish/20241205.fork (https://s.1a23.studio/)
request headers (9) 
{
  "accept-encoding": "gzip, deflate, br",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-d267d0e55a1aac14645e9219518d45ea-8544a45a1a5e3fb4-01",
  "tracestate": "",
  "user-agent": "Firefish/20241205.fork (https://s.1a23.studio/)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-d267d0e55a1aac14645e9219518d45ea-3fe114ec4a456a36-01",
  "x-deno-userspace-tracestate": ""
}