ua-tracer by Paul Kinlan

ua-tracer

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

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Trace h0yN1pmr

First seen: 2026-06-22 20:54:57.354 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
2026-06-22 20:54:57.354 UTC +0 ms homepage GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-07009393799ac8bfb8ea5d1f61aa1106-6949a9586f4ac9fb-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-07009393799ac8bfb8ea5d1f61aa1106-cb8bde652ce7498d-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 20:54:57.921 UTC +567 ms favicon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-1bb3888e4be2c85f87d524abe5716a34-a6d2c04e3fd1e0a9-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-1bb3888e4be2c85f87d524abe5716a34-bf0a8504afe9055f-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 20:54:58.223 UTC +869 ms apple-touch-icon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-b36f8d41eb9fd87a9e298776a81fc5cb-fd3ca326f2db4ae8-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-b36f8d41eb9fd87a9e298776a81fc5cb-43e3d5c709c17319-01",
  "x-deno-userspace-tracestate": ""
}