ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace XcgD6hW6

First seen: 2026-06-25 05:52:26.538 UTC
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36

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
2026-06-25 05:52:26.538 UTC +0 ms homepage GET Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
request headers (8) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-charset": "GBK,utf-8;q=0.7,*;q=0.3",
  "accept-language": "zh-CN,zh;q=0.8",
  "host": "uatracer.com",
  "traceparent": "00-9d199eabed936cf9ac2f4dc271e20836-7aaf5a93e2cb8379-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-25 05:52:34.151 UTC +7613 ms favicon GET Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
request headers (11) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-charset": "GBK,utf-8;q=0.7,*;q=0.3",
  "accept-language": "zh-CN,zh;q=0.8",
  "host": "uatracer.com",
  "referer": "https://uatracer.com",
  "traceparent": "00-2331c615448b3634a70a43f34c5a9d26-85f0814b80030133-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-2331c615448b3634a70a43f34c5a9d26-19279893cb8227f7-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-25 05:52:38.013 UTC +11475 ms JS GET Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
request headers (10) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-charset": "GBK,utf-8;q=0.7,*;q=0.3",
  "accept-language": "zh-CN,zh;q=0.8",
  "host": "uatracer.com",
  "traceparent": "00-c7f90ee9b194f1d448dac87f714b5cd5-dc850b84c981b23d-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-c7f90ee9b194f1d448dac87f714b5cd5-d2e422f988fd8810-01",
  "x-deno-userspace-tracestate": ""
}
2026-06-25 05:52:43.179 UTC +16641 ms ES module GET Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
request headers (8) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "accept-charset": "GBK,utf-8;q=0.7,*;q=0.3",
  "accept-language": "zh-CN,zh;q=0.8",
  "host": "uatracer.com",
  "traceparent": "00-2485ff09ac4b4fa4f08039d0054569f1-7a06eaa22d4af950-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}