ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace Va4hwgOH

First seen: 2026-07-02 19:22:45.750 UTC
User-Agent: Mozilla/5.0 (compatible; research)
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
2026-07-02 19:22:45.750 UTC +0 ms homepage GET Mozilla/5.0 (compatible; research)
request headers (8) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-b7a285faec3cc7b8716edd2b9ae40462-bd21b6964c9687d5-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; research)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-forwarded-proto": "https",
  "x-request-id": "4e3130c6-e166-464a-b0ec-0727856d843b"
}
2026-07-02 19:22:52.180 UTC +6430 ms JS GET Mozilla/5.0 (compatible; research)
request headers (10) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-7e545eb0abbb15e91a76d8363e33ef89-616a1f02ff2ce39e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; research)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-7e545eb0abbb15e91a76d8363e33ef89-79dabc9a1aa2487d-01",
  "x-deno-userspace-tracestate": "",
  "x-forwarded-proto": "https",
  "x-request-id": "6c60bc9c-cad3-464f-a958-59bd38573c62"
}
2026-07-02 19:22:53.296 UTC +7546 ms ES module GET Mozilla/5.0 (compatible; research)
request headers (8) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-1477a21832964c753448a3c2c26f7f6b-6761cc39000af573-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; research)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-forwarded-proto": "https",
  "x-request-id": "76da00cb-22ba-4799-93be-e7d6613c4adb"
}