ua-tracer by Paul Kinlan

ua-tracer

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

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Trace Ip7Q4q6I

First seen: 2026-06-23 08:17:54.913 UTC
User-Agent: Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)

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
2026-06-23 08:17:54.913 UTC +0 ms homepage GET Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "connection": "close",
  "host": "uatracer.com",
  "referer": "http://uatracer.com",
  "traceparent": "00-034b0bcc0c7db15b6f7f7c506d0619ac-e093f77df559ee55-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 08:17:56.994 UTC +2081 ms favicon GET Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)
request headers (7) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-2051bd2745516cc73ff436a41506a030-80454b481690498a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 08:17:57.004 UTC +2091 ms apple-touch-icon GET Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)
request headers (7) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-e474903c9fc5e3a44b8582a1639937d0-e918aa4480706351-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; InternetMeasurement/1.0; +https://internet-measurement.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}