ua-tracer
by Paul Kinlan
trace u8vnFBqG
what does a user agent actually fetch, follow & run?
Trace u8vnFBqG
First seen: 2026-07-10 10:14:51.573 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.
| Received | Δ | Kind | Method | User-Agent |
|---|---|---|---|---|
| 2026-07-10 10:14:51.573 UTC | +0 ms | homepage | GET | meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler) |
request headers (6){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-7dfd03191e213a95aa77b37936056d4a-a7575fe5e6695e01-01",
"tracestate": "",
"user-agent": "meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-13 10:21:58.424 UTC | +259626851 ms | favicon | GET | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
request headers (6){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-55e61a927bd557ef8aa3dc28b009047d-aa725f6c6500f7bf-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-13 10:42:13.534 UTC | +260841961 ms | apple-touch-icon | GET | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
request headers (6){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-086f35fd7d2f989f69deaaffc3e058cb-b31d167beaec7b51-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-13 10:55:46.648 UTC | +261655075 ms | web app manifest | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
request headers (6){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-70c5fd30f0ce7e77843a925bfd91a05d-844c98dddea3f491-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-13 11:11:28.522 UTC | +262596949 ms | iframe document | GET | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
request headers (8){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-41cac890dad276f30c2360aa026f867c-42ddf35dfa242f50-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; 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": "00-41cac890dad276f30c2360aa026f867c-c80c11a68722239b-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-16 11:47:21.357 UTC | +523949784 ms | image inside iframe | GET | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)) |
request headers (6){
"accept": "*/*",
"host": "uatracer.com",
"traceparent": "00-8fd5d45e73504fa2ffb81c7f748446b1-2b1a92f7a91b991b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
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