ua-tracer by Paul Kinlan

ua-tracer

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

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Trace z0yJ3zAI

First seen: 2026-06-22 17:09:43.769 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 17:09:43.769 UTC +0 ms homepage GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-ae6639418da3e8c626fa4ff314e0b7d7-107965348ff0864b-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-ae6639418da3e8c626fa4ff314e0b7d7-f9fc3e9a6230e400-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 17:09:44.271 UTC +502 ms favicon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-0780f7a4636c5e073c530d4ecf501df4-2553463233be192e-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-0780f7a4636c5e073c530d4ecf501df4-10eed9ce2b74cec9-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 17:09:44.728 UTC +959 ms apple-touch-icon GET okhttp/5.3.0
request headers (8) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-a8255faab37747ecb35a391b4f8edd84-2ee24981d263c179-01",
  "tracestate": "",
  "user-agent": "okhttp/5.3.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-a8255faab37747ecb35a391b4f8edd84-1774e47674d1a94c-01",
  "x-deno-userspace-tracestate": ""
}