ua-tracer by Paul Kinlan

trace ugStesUS

ua-tracer

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

← all traces

Trace ugStesUS

First seen: 2026-07-04 20:34:16.288 UTC
User-Agent: Leaf/54 CFNetwork/3860.600.21 Darwin/25.5.0
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
2026-07-04 20:34:16.288 UTC +0 ms homepage GET Leaf/54 CFNetwork/3860.600.21 Darwin/25.5.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "de-DE,de;q=0.9",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-262af3b749591eac2846de1030035fe1-bdbf91ee4034a5a0-01",
  "tracestate": "",
  "user-agent": "Leaf/54 CFNetwork/3860.600.21 Darwin/25.5.0",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-262af3b749591eac2846de1030035fe1-c659ae3983518a26-01",
  "x-deno-userspace-tracestate": ""
}