ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace yeA5DHLe

First seen: 2026-06-26 07:16:08.715 UTC
User-Agent: Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.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
2026-06-26 07:16:08.715 UTC +0 ms homepage 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": "00-20175b4776048052095b87200841a4e9-cce17978f62eb0ef-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": "00-20175b4776048052095b87200841a4e9-6ae73df86386ffb8-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-26 08:54:01.563 UTC +5872848 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-db824c50e40b1aba006289ffd3eb910f-705de9d0a856f35a-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"
}