ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace 9WbA4eGy

First seen: 2026-06-22 12:02:38.573 UTC
User-Agent: Twitterbot/1.0

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
2026-06-22 12:02:38.573 UTC +0 ms homepage GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-49c19c754c3def706f0c39cf740301dc-5c5855de77dbbdd2-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "df9a9bd6386381f0",
  "x-b3-sampled": "false",
  "x-b3-spanid": "1f99c2c4ae8a958a",
  "x-b3-traceid": "00000000000000004994a2f0a522d03e"
}
2026-06-22 12:02:39.108 UTC +535 ms Open Graph image GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-c6552e8395f738afeb3e3fa8c50f7a6c-e26a9898be1a141b-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "6ffe6b53131adcd5",
  "x-b3-sampled": "false",
  "x-b3-spanid": "e7f9e15629f36807",
  "x-b3-traceid": "00000000000000004994a2f0a522d03e"
}
2026-06-22 12:02:39.260 UTC +687 ms Twitter card image GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-79b91b54f0a0148314f7d434d57dd579-4b9754919e885eb5-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "fc19914e7bbfadd1",
  "x-b3-sampled": "false",
  "x-b3-spanid": "94700ed66246e186",
  "x-b3-traceid": "00000000000000004994a2f0a522d03e"
}
2026-06-22 12:02:39.631 UTC +1058 ms Twitter card image GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-a850de0779875d14da24a994af1437ef-a55336a401541a8f-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17167166818",
  "x-b3-parentspanid": "c297f5a890576039",
  "x-b3-sampled": "false",
  "x-b3-spanid": "d67d895d507d14db",
  "x-b3-traceid": "d8eb646da9c05277"
}
2026-06-22 12:02:39.687 UTC +1114 ms Open Graph image GET Twitterbot/1.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-59e783bffc127f86c708df35a6cb1022-a83c850559fa1dce-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17167166818",
  "x-b3-parentspanid": "544ff230d59c4319",
  "x-b3-sampled": "false",
  "x-b3-spanid": "95212f9482ff42a3",
  "x-b3-traceid": "d8eb646da9c05277",
  "x-deno-userspace-traceparent": "00-59e783bffc127f86c708df35a6cb1022-6a6b77dc4b462312-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 12:02:40.311 UTC +1738 ms Twitter card image GET Twitterbot/1.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-12c47470c8c1aae34f98e05a10b06132-905394c6a594e187-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "527305a8e147957e",
  "x-b3-sampled": "false",
  "x-b3-spanid": "ecfeebe896b52965",
  "x-b3-traceid": "3128c0583966529c",
  "x-deno-userspace-traceparent": "00-12c47470c8c1aae34f98e05a10b06132-078d3701868c33b7-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-22 12:02:40.315 UTC +1742 ms Twitter card image GET Twitterbot/1.0
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "ua-tracer.paulkinlan-ea.deno.net",
  "traceparent": "00-1feb10f5b8f06fae2cef75f8b63e5dc8-dad58e4ebfb06892-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "d5c89e9e5ef889d8",
  "x-b3-sampled": "false",
  "x-b3-spanid": "309bed4b887c11e0",
  "x-b3-traceid": "5d0f155d402ae9a8",
  "x-deno-userspace-traceparent": "00-1feb10f5b8f06fae2cef75f8b63e5dc8-70fbe7ac134255db-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-29 12:13:18.791 UTC +605440218 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-f53b3c24eefbbc925f92034aae56ae54-486d1ae4ee659152-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "ecb2438b6c22784f",
  "x-b3-sampled": "false",
  "x-b3-spanid": "426db6701e5b5a02",
  "x-b3-traceid": "0000000000000000629a6268a95a06db",
  "x-deno-userspace-traceparent": "00-f53b3c24eefbbc925f92034aae56ae54-bb40c1f925efdcf8-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-29 12:13:18.879 UTC +605440306 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-c15ab2fb870caffa16405a829753566f-9e1e6cc51599b9b5-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "9c86e2828751080f",
  "x-b3-sampled": "false",
  "x-b3-spanid": "13a10d711a1b51bf",
  "x-b3-traceid": "0000000000000000629a6268a95a06db",
  "x-deno-userspace-traceparent": "00-c15ab2fb870caffa16405a829753566f-23e3f69edcb89bf2-01",
  "x-deno-userspace-tracestate": ""
}