ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace icMbraRK

First seen: 2026-07-03 06:47:13.157 UTC
User-Agent: DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)
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 06:47:13.157 UTC +0 ms homepage GET DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "en-US,en;q=0.8,zh;q=0.6,es;q=0.4",
  "connection": "close",
  "host": "uatracer.com",
  "referer": "http://uatracer.com",
  "signature": "sig1=:jw86KbnLpTpmVOsSbuNpGZoXSRVjXpiFniajsREpiy/UgUvEKMLbn3DrMIPKlkhUvIW2BOn9OGN8BoxWy/SoDg==:",
  "signature-agent": "https://bot.duckduckgo.com",
  "signature-input": "sig1=(\"@method\" \"@authority\" \"@path\" \"signature-agent\");created=1783061233;expires=1783061833;alg=\"ed25519\";tag=\"web-bot-auth\";keyid=\"5HvpfNA946z6lcCXEIOOpzlN5l0mdZE42jdqimEwPf8\"",
  "traceparent": "00-4b7455530636029603e8c3ee29af3a6a-7f72357da7e2cdfe-01",
  "tracestate": "",
  "user-agent": "DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-07-03 06:47:14.812 UTC +1655 ms favicon GET DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "en-US,en;q=0.8,zh;q=0.6,es;q=0.4",
  "connection": "close",
  "host": "uatracer.com",
  "signature": "sig1=:nOBkCY2CJHqHtgv8qwjpskYJUgy0CMkrKNN2lmn5B8lX9FhE3pdrj0oiDL315a23H+7CU7tUyuvzhU6jra16CQ==:",
  "signature-agent": "https://bot.duckduckgo.com",
  "signature-input": "sig1=(\"@method\" \"@authority\" \"@path\" \"signature-agent\");created=1783061234;expires=1783061834;alg=\"ed25519\";tag=\"web-bot-auth\";keyid=\"5HvpfNA946z6lcCXEIOOpzlN5l0mdZE42jdqimEwPf8\"",
  "traceparent": "00-cf290defe7a1106f3e343b9cd735ea9e-b89dd229d94b5463-01",
  "tracestate": "",
  "user-agent": "DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}