ua-tracer by Paul Kinlan

trace F5RzUTL9

ua-tracer

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

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Trace F5RzUTL9

First seen: 2026-07-16 02:58:54.311 UTC
User-Agent: Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.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
2026-07-16 02:58:54.311 UTC +0 ms homepage GET Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "br, gzip",
  "connection": "Keep-Alive",
  "host": "uatracer.com",
  "traceparent": "00-a72c8d8c310c755b20a413387d6c2aad-d42938e58825b854-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-07-17 13:22:36.390 UTC +123822079 ms iframe document GET Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)
request headers (8) 
{
  "accept": "text/html,text/plain,text/xml,text/*,application/xml,application/xhtml+xml,application/rss+xml,application/atom+xml,application/rdf+xml,application/php,application/x-php,application/x-httpd-php",
  "accept-encoding": "br,gzip",
  "accept-language": "en",
  "host": "uatracer.com",
  "traceparent": "00-833e3cb996b0e1b792fa8f347a200977-1f44ce5db4f5ddbd-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}