ua-tracer by Paul Kinlan

trace Un7XsY7m

ua-tracer

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

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Trace Un7XsY7m

First seen: 2026-07-25 05:53:23.323 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
2026-07-25 05:53:23.323 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": "00-899e5e36f790c578a746b392e67e7533-0ef10c4fc70dc2ff-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "bf00d42399871b68",
  "x-b3-sampled": "false",
  "x-b3-spanid": "8de5cafaae62a9f1",
  "x-b3-traceid": "0000000000000000031c6b5389acadb0",
  "x-deno-userspace-traceparent": "00-899e5e36f790c578a746b392e67e7533-2610468dfb579f24-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-25 05:53:24.766 UTC +1443 ms Twitter card image GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "uatracer.com",
  "traceparent": "00-08980e140c44692a5e565fc4a2a0e78d-b73805af48741f4e-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "6c382cc7ea363700",
  "x-b3-sampled": "false",
  "x-b3-spanid": "8542f8ad6b1b6d77",
  "x-b3-traceid": "0000000000000000031c6b5389acadb0"
}
2026-07-25 05:53:24.776 UTC +1453 ms Open Graph 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-cddc72be14aabd176e090f4d1993eda8-b305508cd0c0e983-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "13af20d9b69c3e80",
  "x-b3-sampled": "false",
  "x-b3-spanid": "d26ca12f48f791fa",
  "x-b3-traceid": "0000000000000000031c6b5389acadb0",
  "x-deno-userspace-traceparent": "00-cddc72be14aabd176e090f4d1993eda8-8ca793946597ab6f-01",
  "x-deno-userspace-tracestate": ""
}