ua-tracer by Paul Kinlan

trace 4FmaQ8UE

ua-tracer

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

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Trace 4FmaQ8UE

First seen: 2026-09-13 05:17:59.804 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
2026-09-13 05:17:59.804 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": "00-8906abfcfdd12c941a85bc85ad1d3d48-437ba8faa4e16b65-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "04810198d2212896",
  "x-b3-sampled": "false",
  "x-b3-spanid": "205b05596cf427bc",
  "x-b3-traceid": "000000000000000008fb3815e123b7ac",
  "x-deno-userspace-traceparent": "00-8906abfcfdd12c941a85bc85ad1d3d48-499b3a440d1df0df-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-13 05:18:00.124 UTC +320 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": "00-3dfd8ba59904e95f5b71f5d3e2117eae-14f84d275a695648-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "56465694b1ba8070",
  "x-b3-sampled": "false",
  "x-b3-spanid": "8ad570f70010b686",
  "x-b3-traceid": "000000000000000008fb3815e123b7ac",
  "x-deno-userspace-traceparent": "00-3dfd8ba59904e95f5b71f5d3e2117eae-5dfc1ef48275b727-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-13 05:18:00.532 UTC +728 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": "00-515d089fe3006246ad5edcea9e5be578-3d2eea5f9ce2908b-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "18b7eae31de8634e",
  "x-b3-sampled": "false",
  "x-b3-spanid": "08597bcd4065a02d",
  "x-b3-traceid": "000000000000000008fb3815e123b7ac",
  "x-deno-userspace-traceparent": "00-515d089fe3006246ad5edcea9e5be578-fbbc31af2b503a22-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-21 22:59:34.560 UTC +754894756 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": "00-3909982287e164dbb9055ddf38e0b8ae-89fba1dd051de9bf-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "87855ed020dce1ed",
  "x-b3-sampled": "false",
  "x-b3-spanid": "0eb8fb8402ea6470",
  "x-b3-traceid": "0000000000000000c778d1e4fb566920"
}
2026-09-21 22:59:34.562 UTC +754894758 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": "00-2d1f9f29f0d55523189966588edbe67f-d0c92bb5da6aa816-01",
  "tracestate": "",
  "user-agent": "Twitterbot/1.0",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-b3-flags": "17146314754",
  "x-b3-parentspanid": "29e9848244c063b1",
  "x-b3-sampled": "false",
  "x-b3-spanid": "cbe0750eb0f54c13",
  "x-b3-traceid": "0000000000000000c778d1e4fb566920"
}