ua-tracer by Paul Kinlan

trace Zmc5Ezn2

ua-tracer

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

← all traces

Trace Zmc5Ezn2

First seen: 2026-10-19 17:06:02.695 UTC
User-Agent: Mozilla/5.0 Firefox/143.0
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
2026-10-19 17:06:02.695 UTC +0 ms homepage GET Mozilla/5.0 Firefox/143.0
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "traceparent": "00-b490a0edd70a3e2ad64b294cb77118c4-7bde1f5ae6e83fa5-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-10-19 17:06:03.128 UTC +433 ms CSS GET Mozilla/5.0 Firefox/143.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/",
  "traceparent": "00-794efb738cd4376200dbb268c1a1597b-558dc3783a61f377-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-10-19 17:06:03.339 UTC +644 ms CSS @import (nested stylesheet) GET Mozilla/5.0 Firefox/143.0
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/",
  "traceparent": "00-9de2ee562d6b75ae1e76e7ec439c23e8-916a73f8a19b3776-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-10-19 17:06:48.652 UTC +45957 ms CSS @font-face GET Mozilla/5.0 Firefox/143.0
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "referer": "https://uatracer.com",
  "traceparent": "00-6f06fd30a889ca3c0470307fc1cef8ad-a4de28e88755fe67-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 Firefox/143.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-6f06fd30a889ca3c0470307fc1cef8ad-573b6493ba83e414-01",
  "x-deno-userspace-tracestate": ""
}