ua-tracer by Paul Kinlan

trace xXZX0VSe

ua-tracer

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

← all traces

Trace xXZX0VSe

First seen: 2026-06-22 12:06:50.291 UTC
User-Agent: http.rb/5.1.1 (Mastodon/4.2.18; +https://mastodon.ehlo.world/) Bot
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
2026-06-22 12:06:50.291 UTC +0 ms homepage GET http.rb/5.1.1 (Mastodon/4.2.18; +https://mastodon.ehlo.world/) Bot
request headers (9) 
{
  "accept": "text/html",
  "accept-encoding": "gzip",
  "connection": "close",
  "date": "Mon, 22 Jun 2026 12:06:50 GMT",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-90bb16e41653ddbea7fafe144b222c4a-4ffc3ae7c62e3f4b-01",
  "tracestate": "",
  "user-agent": "http.rb/5.1.1 (Mastodon/4.2.18; +https://mastodon.ehlo.world/) Bot",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-22 12:06:50.647 UTC +356 ms Open Graph image GET http.rb/5.1.1 (Mastodon/4.2.18; +https://mastodon.ehlo.world/)
request headers (8) 
{
  "accept-encoding": "gzip",
  "connection": "close",
  "date": "Mon, 22 Jun 2026 12:06:50 GMT",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-b802232e0e207757e7f9060aa10201e4-05f4eeb843dba5ab-01",
  "tracestate": "",
  "user-agent": "http.rb/5.1.1 (Mastodon/4.2.18; +https://mastodon.ehlo.world/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}