ua-tracer by Paul Kinlan

ua-tracer

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

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Trace mwpfk4Mg

First seen: 2026-06-23 15:43:12.550 UTC
User-Agent: Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)

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 15:43:12.550 UTC +0 ms homepage GET Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-77b426cc79fe5d4c941388889d7f69f8-0e50f5c25e2ee297-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 15:43:14.249 UTC +1699 ms JS GET Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-6525a8f2f0e4e0fba2957159b918eb59-b2586603dab81fe2-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 15:43:14.252 UTC +1702 ms ES module GET Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-43a93e8d9a0b254fca659bdf5193250b-d460485e57e3088f-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 15:43:16.680 UTC +4130 ms web app manifest GET Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-cb59bb3b3f57f38da7baedd9e3d54237-aa7a2649eb7e7443-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}