ua-tracer by Paul Kinlan

trace 5mw8Iskb

ua-tracer

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

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Trace 5mw8Iskb

First seen: 2026-06-25 17:01:20.824 UTC
User-Agent: meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
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
2026-06-25 17:01:20.824 UTC +0 ms homepage GET meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
request headers (8) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-81b979983a028478dc67802e63192ed8-659e6b710a709205-01",
  "tracestate": "",
  "user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-81b979983a028478dc67802e63192ed8-ae7cd737e10b13e4-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-27 20:54:30.828 UTC +186790004 ms favicon GET meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-2292598744567b661045a7f0aadd823d-780ba368527e4a36-01",
  "tracestate": "",
  "user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-27 22:50:27.278 UTC +193746454 ms web app manifest GET meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-a907a1ef6b3afa63c088409beb364667-3b14b2e7c806fb32-01",
  "tracestate": "",
  "user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-27 23:07:44.080 UTC +194783256 ms iframe document GET meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-6909ab1f98a0120c4ed21514c540528c-44dbe08267e1a912-01",
  "tracestate": "",
  "user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-28 17:41:42.654 UTC +261621830 ms image GET meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-681ac12d72dfa1e6ef7e53fcc50f22cc-5e5d8ffb7fb9bcb1-01",
  "tracestate": "",
  "user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}