ua-tracer by Paul Kinlan

trace NsHXyekl

ua-tracer

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

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Trace NsHXyekl

First seen: 2026-07-04 09:40:49.000 UTC
User-Agent: Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)
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
2026-07-04 09:40:49.000 UTC +0 ms homepage GET Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "host": "uatracer.com",
  "range": "bytes=0-32768",
  "traceparent": "00-0899aeac8972a259008109a1fb26056b-0e7155b1398348a4-01",
  "tracestate": "",
  "user-agent": "Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-04 09:40:50.167 UTC +1167 ms Open Graph image GET Slackbot 1.0 (+https://api.slack.com/robots)
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "host": "uatracer.com",
  "traceparent": "00-b795603b46b1c22fd75976f7e6d6b933-4dcfd666c2110c88-01",
  "tracestate": "",
  "user-agent": "Slackbot 1.0 (+https://api.slack.com/robots)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-b795603b46b1c22fd75976f7e6d6b933-be590cce2cc06763-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-04 09:40:50.663 UTC +1663 ms apple-touch-icon GET Slackbot 1.0 (+https://api.slack.com/robots)
request headers (7) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate",
  "host": "uatracer.com",
  "traceparent": "00-f9e707ea03ba9a339efff924aafdbb4d-5842b160fafaf287-01",
  "tracestate": "",
  "user-agent": "Slackbot 1.0 (+https://api.slack.com/robots)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-04 12:00:02.937 UTC +8353937 ms apple-touch-icon GET Slack-ImgProxy (+https://api.slack.com/robots)
request headers (7) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "host": "uatracer.com",
  "traceparent": "00-7db78cb0f4dd8c5474211dd9162bc7c0-0a12cb875c6cf6fb-01",
  "tracestate": "",
  "user-agent": "Slack-ImgProxy (+https://api.slack.com/robots)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}