ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace YUUa09HF

First seen: 2026-07-02 19:11:01.460 UTC
User-Agent: facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
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
2026-07-02 19:11:01.460 UTC +0 ms homepage GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip",
  "host": "uatracer.com",
  "range": "bytes=0-524287",
  "traceparent": "00-63d2ba34ab5fcfa56bf301dfed1188f5-bcc05adce79a502e-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-02 19:11:03.500 UTC +2040 ms Open Graph image GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (8) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-c88e241369d40b7429dc6f14c8cdce22-2b1225f9687fef3b-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-c88e241369d40b7429dc6f14c8cdce22-da3eb691a7e6a5ee-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-02 19:11:04.420 UTC +2960 ms image GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-b26c855eb902c2d225d29aa92ec1537c-3957aae1cf8aa0b1-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-07-02 19:11:07.068 UTC +5608 ms Open Graph image GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-ad6e2f9e4a76ce8e58fdf28fca865822-87a4ac71a6789a2b-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-07-02 19:11:07.102 UTC +5642 ms image GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (8) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-6f5fe5cf5bf61906dd3a723fd28d7ae3-50df2193fb28cecd-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-6f5fe5cf5bf61906dd3a723fd28d7ae3-53c594174017293e-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-02 19:11:30.360 UTC +28900 ms image GET facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-39244169c5ec247c18445e0a4ce6097d-5546e6bf8b213d75-01",
  "tracestate": "",
  "user-agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}