ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace Eb6CwJ44

First seen: 2026-07-03 08:14:36.462 UTC
User-Agent: Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0
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
2026-07-03 08:14:36.462 UTC +0 ms homepage GET Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0
request headers (9) 
{
  "accept": "text/html,application/xhtml+xml",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "host": "uatracer.com",
  "priority": "u=3, i",
  "traceparent": "00-3d2c527e896c372194e0de97798b1bfe-59dcc43ea1eb4e8d-01",
  "tracestate": "",
  "user-agent": "Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-07-03 08:14:38.099 UTC +1637 ms web app manifest GET Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=Eb6CwJ44",
  "host": "uatracer.com",
  "priority": "u=3, i",
  "traceparent": "00-10684beb1098d2b099c4a7acec17acbc-475b48f663dd17b5-01",
  "tracestate": "",
  "user-agent": "Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-07-03 08:14:38.769 UTC +2307 ms Open Graph image GET Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=Eb6CwJ44",
  "host": "uatracer.com",
  "priority": "u=3, i",
  "traceparent": "00-1b17fc1bc63b5fda592ce4ec8dc947a6-2464a6fd4c15fde2-01",
  "tracestate": "",
  "user-agent": "Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-07-03 08:14:38.772 UTC +2310 ms favicon GET Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "accept-language": "en-US,en;q=0.9",
  "cookie": "ua-tracer-trace=Eb6CwJ44",
  "host": "uatracer.com",
  "priority": "u=3, i",
  "traceparent": "00-c6c3926e60188e86ddc40771970a3e3e-39d179df790f0242-01",
  "tracestate": "",
  "user-agent": "Expo/57.0.2 CFNetwork/3860.300.31 Darwin/25.5.0",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}