ua-tracer by Paul Kinlan

trace 3uA5rw8G

ua-tracer

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

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Trace 3uA5rw8G

First seen: 2026-09-21 22:59:34.744 UTC
User-Agent: Twitterbot/1.0
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
2026-09-21 22:59:34.744 UTC +0 ms homepage GET Twitterbot/1.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "uatracer.com",
  "traceparent": "00-2fd834e62143455afd0c5ffec6f2f487-cc80e089a88596b1-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "eeb796e15a50dbe0",
  "x-b3-sampled": "false",
  "x-b3-spanid": "632d4926d2b7a486",
  "x-b3-traceid": "00000000000000006dcccc9b9185d0b7",
  "x-deno-userspace-traceparent": "00-2fd834e62143455afd0c5ffec6f2f487-29cf57faa4d37639-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-21 22:59:35.105 UTC +361 ms Open Graph image GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "uatracer.com",
  "traceparent": "00-d6673a901558928b45194f90fb81d965-3cfd6246a0ead544-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "b91282fc254f3ca6",
  "x-b3-sampled": "false",
  "x-b3-spanid": "4593b3e85d4b6274",
  "x-b3-traceid": "00000000000000006dcccc9b9185d0b7"
}
2026-09-21 22:59:35.334 UTC +590 ms Twitter card image GET Twitterbot/1.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "uatracer.com",
  "traceparent": "00-aa0e7d2b592e9be5530dc07ecaadd93c-0920019d30d45a88-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "d4c41d23fcee7fc8",
  "x-b3-sampled": "false",
  "x-b3-spanid": "b742905c10131830",
  "x-b3-traceid": "00000000000000006dcccc9b9185d0b7",
  "x-deno-userspace-traceparent": "00-aa0e7d2b592e9be5530dc07ecaadd93c-59c85fc14c672ba6-01",
  "x-deno-userspace-tracestate": ""
}