ua-tracer by Paul Kinlan

trace UcxUvlen

ua-tracer

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

← all traces

Trace UcxUvlen

First seen: 2026-08-05 19:35:53.988 UTC
User-Agent: crawlio/1.0.0 (+abuse@google.com)
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
2026-08-05 19:35:53.988 UTC +0 ms homepage GET crawlio/1.0.0 (+abuse@google.com)
request headers (10) 
{
  "accept": "text/html,application/xhtml+xml;q=0.9,*/*;q=0.1",
  "accept-encoding": "br, gzip, deflate",
  "accept-language": "en;q=0.9,*;q=0.5",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "sec-fetch-mode": "cors",
  "traceparent": "00-1d78d8f1ab6cd05f25a318a07e692831-56f30e56c754185b-01",
  "tracestate": "",
  "user-agent": "crawlio/1.0.0 (+abuse@google.com)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}