ua-tracer by Paul Kinlan

trace 05I1ZIRN

ua-tracer

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

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Trace 05I1ZIRN

First seen: 2026-10-27 03:41:31.131 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
2026-10-27 03:41:31.131 UTC +0 ms homepage GET Twitterbot/1.0
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "finagle-ctx-com.twitter.finagle.retries": "0",
  "host": "uatracer.com",
  "traceparent": "00-c7fdd6e167d22fb7b5516e4fa52a1319-f053b05649377bad-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "b6d38a9c8676ba3d",
  "x-b3-sampled": "false",
  "x-b3-spanid": "ca113cfff8a3257e",
  "x-b3-traceid": "0000000000000000ea2eccd4aedf5922"
}
2026-10-27 03:41:32.773 UTC +1642 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-c8653fbfc016b7378b218ccf728d5f4c-9408d48ef5dd44d6-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "5f455ba4ad4aa9cf",
  "x-b3-sampled": "false",
  "x-b3-spanid": "0e7d281dfd1abdfd",
  "x-b3-traceid": "0000000000000000ea2eccd4aedf5922",
  "x-deno-userspace-traceparent": "00-c8653fbfc016b7378b218ccf728d5f4c-2b16b1b9f095e71a-01",
  "x-deno-userspace-tracestate": ""
}
2026-10-27 03:41:32.913 UTC +1782 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": "00-7e4a476fe5007e0260bd64ad07b2b78d-1be0402396a2fbc6-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "21468321b7402ce7",
  "x-b3-sampled": "false",
  "x-b3-spanid": "43fae62f5c8b551a",
  "x-b3-traceid": "0000000000000000ea2eccd4aedf5922",
  "x-deno-userspace-traceparent": "00-7e4a476fe5007e0260bd64ad07b2b78d-8f357d9aea1503d2-01",
  "x-deno-userspace-tracestate": ""
}
2026-11-05 22:33:37.268 UTC +845526137 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-c4e361cb5932b030c656717cf135250e-f344d7ee0fb3af45-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "9c2e2b205cab2f45",
  "x-b3-sampled": "false",
  "x-b3-spanid": "fe418ee272a4163b",
  "x-b3-traceid": "a50a98ec2cd038017c0ce934ac153e6f",
  "x-deno-userspace-traceparent": "00-c4e361cb5932b030c656717cf135250e-84e09ec4f73232b7-01",
  "x-deno-userspace-tracestate": ""
}
2026-11-05 22:33:37.288 UTC +845526157 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": "00-5e59eea5135e7c87276af0c453a9c5e7-062755e4f1f7267e-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "ddf3df29e4dd076f",
  "x-b3-sampled": "false",
  "x-b3-spanid": "681e7e086ebb6dfe",
  "x-b3-traceid": "a50a98ec2cd038017c0ce934ac153e6f",
  "x-deno-userspace-traceparent": "00-5e59eea5135e7c87276af0c453a9c5e7-62f178875320835c-01",
  "x-deno-userspace-tracestate": ""
}