ua-tracer by Paul Kinlan

ua-tracer

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

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Trace 4WTSE6iZ

First seen: 2026-06-23 01:02:55.228 UTC
User-Agent: okhttp/5.3.0

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
2026-06-23 01:02:55.228 UTC +0 ms homepage GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-6daa9976912c862a59d5b3b7b19aa09f-9734731b31ce5d25-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-6daa9976912c862a59d5b3b7b19aa09f-0202cb052cb90f86-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-23 01:02:55.728 UTC +500 ms favicon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-c151e2df564b1af9a0920b3949775e24-76276ffbf2a6b41e-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-c151e2df564b1af9a0920b3949775e24-4a9150d2e4a2082b-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-23 01:02:56.031 UTC +803 ms apple-touch-icon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-9885dff3ea410d54d4a9a7e412169127-4c07fc7178a130e4-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-9885dff3ea410d54d4a9a7e412169127-e450413b879ce31a-01",
  "x-deno-userspace-tracestate": ""
}