ua-tracer by Paul Kinlan

trace AQ5EXiKk

ua-tracer

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

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Trace AQ5EXiKk

First seen: 2026-08-22 12:07:25.812 UTC
User-Agent: Mozilla/5.0 (compatible; MJ12bot/v1.4.8; 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
2026-08-22 12:07:25.812 UTC +0 ms homepage 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": "00-1169112be9cf89915d103f87786979ee-813adee1ed1e8494-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-08-22 14:22:11.836 UTC +8086024 ms iframe document GET Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)
request headers (11) 
{
  "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",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-e5593221838459b539a05ca9bed41489-99153db4525d7505-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-e5593221838459b539a05ca9bed41489-e6d5be41c1eb7534-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-24 16:30:41.594 UTC +188595782 ms iframe document GET Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)
request headers (11) 
{
  "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",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-87f6862f59cf6314e9b120284ebbdc4d-dcb9b57cf0aeac55-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-87f6862f59cf6314e9b120284ebbdc4d-5d231d1eb24c8a6e-01",
  "x-deno-userspace-tracestate": ""
}