ua-tracer by Paul Kinlan

trace 9WCtvLdf

ua-tracer

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

← all traces

Trace 9WCtvLdf

First seen: 2026-08-06 10:48:34.454 UTC
User-Agent: Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)
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
2026-08-06 10:48:34.454 UTC +0 ms homepage GET Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate,br",
  "host": "uatracer.com",
  "traceparent": "00-a185132f7376b79cc92fbb7f17c80f5c-0d360c1449cc50dd-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-a185132f7376b79cc92fbb7f17c80f5c-aec9315721706cde-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-06 10:48:42.209 UTC +7755 ms JS GET Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate,br",
  "host": "uatracer.com",
  "traceparent": "00-2ef26e10c006f73cd156a903f6673d34-c14d77b96d534213-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-2ef26e10c006f73cd156a903f6673d34-7a30e40c54fb143f-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-06 10:48:42.210 UTC +7756 ms ES module GET Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)
request headers (9) 
{
  "accept": "*/*",
  "accept-encoding": "gzip,deflate,br",
  "host": "uatracer.com",
  "traceparent": "00-4bd72e24b34e841c9c6a99969fa97f8c-dbb1e6931a5c3284-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-4bd72e24b34e841c9c6a99969fa97f8c-a37f3ee4ce84347a-01",
  "x-deno-userspace-tracestate": ""
}