ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace NxT39zQF

First seen: 2026-06-23 10:47:33.443 UTC
User-Agent: Scrapy/2.16.0 (+https://scrapy.org)

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
2026-06-23 10:47:33.443 UTC +0 ms homepage GET Scrapy/2.16.0 (+https://scrapy.org)
request headers (8) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en",
  "host": "uatracer.com",
  "traceparent": "00-2484074f5f0071bd1aa6c80433e0b139-b6f9ebe4703828cd-01",
  "tracestate": "",
  "user-agent": "Scrapy/2.16.0 (+https://scrapy.org)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 10:50:52.410 UTC +198967 ms apple-touch-icon GET Scrapy/2.16.0 (+https://scrapy.org)
request headers (8) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en",
  "host": "uatracer.com",
  "traceparent": "00-0675fd2a166d0832b63cae1ec7cd1ae3-1f65b646d20c5b97-01",
  "tracestate": "",
  "user-agent": "Scrapy/2.16.0 (+https://scrapy.org)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-06-23 10:50:52.413 UTC +198970 ms favicon GET Scrapy/2.16.0 (+https://scrapy.org)
request headers (8) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-encoding": "gzip, deflate",
  "accept-language": "en",
  "host": "uatracer.com",
  "traceparent": "00-11ca4de7cae34e7aed772dc40983bfbe-e3d30dd2850c5d86-01",
  "tracestate": "",
  "user-agent": "Scrapy/2.16.0 (+https://scrapy.org)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}