ua-tracer by Paul Kinlan

trace xcV5dsPr

ua-tracer

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

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Trace xcV5dsPr

First seen: 2026-09-04 17:03:05.104 UTC
User-Agent: Python-urllib/3.14
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
2026-09-04 17:03:05.104 UTC +0 ms homepage HEAD Python-urllib/3.14
request headers (9) 
{
  "accept-encoding": "identity",
  "baggage": "sentry-trace_id=38d7696067ea400e9d09966c9a8c6cf3,sentry-sample_rand=0.615092,sentry-environment=production,sentry-public_key=ed8c126a7a69b76802faaf474d8f7468,sentry-transaction=crawler-v2%3Awebsites,sentry-sample_rate=0.1,sentry-sampled=false",
  "connection": "close",
  "host": "uatracer.com",
  "sentry-trace": "38d7696067ea400e9d09966c9a8c6cf3-a251e110d8546edc-0",
  "traceparent": "00-c8be259a1cb83f8e7acbfcf949edebe8-f1c842a9f613a75d-01",
  "tracestate": "",
  "user-agent": "Python-urllib/3.14",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}