ua-tracer by Paul Kinlan

trace PAynDHst

ua-tracer

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

← all traces

Trace PAynDHst

First seen: 2026-09-07 15:28:38.782 UTC
User-Agent: Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.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
2026-09-07 15:28:38.782 UTC +0 ms homepage GET Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-cn,zh-tw",
  "host": "uatracer.com",
  "traceparent": "00-7acf23f2c8ade0054775f377b99ea7aa-bde9b72fd49dda75-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.764 UTC +31982 ms font (HTML) GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-a0a41df7f575cbd2d2aa2b1fc11529c1-6b4162377d467ac8-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.798 UTC +32016 ms image GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-6417b0b335c2b01202e7799bee8b994a-36e97032931f4048-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.800 UTC +32018 ms CSS GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (13) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-c85f208990c0b4f42894248a8a3072b0-9d6234350d91ae5a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-c85f208990c0b4f42894248a8a3072b0-7ca1ac320543e64e-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-07 15:29:10.809 UTC +32027 ms preload (image) GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-5c78f2a63b9ea17b65218553ec5fd0be-15e5b0862f7c1825-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.817 UTC +32035 ms ES module GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-57e881afaf8347e5d9c3c1f05baffb1f-b47df9a70fe8dfb3-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.822 UTC +32040 ms prefetch GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-2e7b1c0642ea28754683fbc9f4302ef0-d91b954bcf7e581e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.830 UTC +32048 ms JS GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-709b9ea2d0f0fca45d94c2b3a34e43b0-b0eea071ba721786-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:10.863 UTC +32081 ms iframe document GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (12) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-e798457e8148fdd58b0df3984f49c8e8-05c3748d4df3ee20-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:12.945 UTC +34163 ms CSS @import (nested stylesheet) GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/r/PAynDHst/57Z7L5sq/style.css",
  "traceparent": "00-4e9cbbb89b30bc9dfc07fafbbadd6926-7d523539e4cee82c-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:14.497 UTC +35715 ms image inside iframe GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/r/PAynDHst/57Z7L5sq/iframe",
  "traceparent": "00-d8d8ef4966d0e4d451bef153d0dd732e-51ce9ee915fe109a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.189 UTC +37407 ms JS executed beacon GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-1079b9557b4777275bc51aa549708c1a-17305b764d03215c-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.190 UTC +37408 ms CSS @font-face GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "referer": "https://uatracer.com/r/PAynDHst/57Z7L5sq/style.css",
  "traceparent": "00-8c16b5cf2b75ac533dea359c355ddb19-7184cb6a8ddc93db-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.201 UTC +37419 ms CSS background-image GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/r/PAynDHst/57Z7L5sq/style.css",
  "traceparent": "00-672e0a156396ba3b75b556c2429b1621-5074c661c990e12d-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.252 UTC +37470 ms ES module executed GET Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (11) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-e7b67b0f7a220c937f021bb93930a53a-434851ed8d8f431e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.282 UTC +37500 ms Reporting API report (POST) POST Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (14) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "content-length": "0",
  "content-type": "application/json",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-b50c86c79c82ef0d59641657a06e42fe-e9a0247315ad7edb-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-07 15:29:16.881 UTC +38099 ms CSP violation report (POST) POST Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
request headers (14) 
{
  "accept": "*/*",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
  "connection": "Close",
  "content-length": "0",
  "content-type": "application/json",
  "cookie": "ua-tracer-trace=PAynDHst",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "referer": "https://uatracer.com/?utm_source=stefanjudis&utm_medium=email&utm_campaign=u1f9e2-web-weekly-196-ecmascript-2026-and-wiggly",
  "traceparent": "00-a8560ee8185b16d310bcdd2bd3544316-e43324a77884e19b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-09-09 22:34:25.927 UTC +198347145 ms iframe document GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36
request headers (9) 
{
  "accept-encoding": "gzip,deflate",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-5ab39fe1cc3fbad283a47d15d5e7ea20-669972f4a0b80f9a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-5ab39fe1cc3fbad283a47d15d5e7ea20-386cdade777e7f3d-01",
  "x-deno-userspace-tracestate": ""
}
2026-09-09 22:34:28.823 UTC +198350041 ms image inside iframe GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36
request headers (9) 
{
  "accept-encoding": "gzip,deflate",
  "connection": "close",
  "host": "uatracer.com",
  "traceparent": "00-52a5391386c7f09b07ceeeee868343ae-31801d37a3e2b065-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-52a5391386c7f09b07ceeeee868343ae-00f26ae8a56c75a2-01",
  "x-deno-userspace-tracestate": ""
}

Client-side resource waterfall

JS executed (beacon hit) but no resource-timing payload was posted (UA may block sendBeacon/fetch or strip the body).