ua-tracer by Paul Kinlan

trace 9Ly2rAP8

ua-tracer

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

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Trace 9Ly2rAP8

First seen: 2026-08-19 09:48:36.951 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
2026-08-19 09:48:36.951 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": "00-46ebcbf2d2a9bd26fb16e8af3952efb8-a24249b51abd3305-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17167166818",
  "x-b3-parentspanid": "c718f6a4ebc34a01",
  "x-b3-sampled": "false",
  "x-b3-spanid": "ebb178ab81b19508",
  "x-b3-traceid": "be4b45143ab54027",
  "x-deno-userspace-traceparent": "00-46ebcbf2d2a9bd26fb16e8af3952efb8-1a47524dc55a5965-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-19 09:48:38.697 UTC +1746 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": "00-170d83366f6c9717d8e6a9203835ed3d-a146feccfac8b758-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17167166818",
  "x-b3-parentspanid": "b399d7b0091c1c7a",
  "x-b3-sampled": "false",
  "x-b3-spanid": "2d8a14199c77a16d",
  "x-b3-traceid": "be4b45143ab54027",
  "x-deno-userspace-traceparent": "00-170d83366f6c9717d8e6a9203835ed3d-cd7aebd787357427-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-19 09:48:38.698 UTC +1747 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": "00-9df618731e65c6bebf0c6e29261e2b9b-2b4ffd3d9977e221-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17167166818",
  "x-b3-parentspanid": "0d9295ca5d122549",
  "x-b3-sampled": "false",
  "x-b3-spanid": "07a1bced243a05d9",
  "x-b3-traceid": "be4b45143ab54027",
  "x-deno-userspace-traceparent": "00-9df618731e65c6bebf0c6e29261e2b9b-d0af3667f7321e09-01",
  "x-deno-userspace-tracestate": ""
}