ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace HDvyE18U

First seen: 2026-06-23 16:15:16.526 UTC
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 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
2026-06-23 16:15:16.526 UTC +0 ms homepage GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (16) 
{
  "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, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=0, i",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "document",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "none",
  "sec-fetch-user": "?1",
  "traceparent": "00-78518366b1c4b4c59b3f4921217517a6-c105d80844889266-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.889 UTC +363 ms CSS GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-01f4f7d1b482093b5f7c293d649b6000-e7694879e6500afb-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.892 UTC +366 ms font (HTML) GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-b76a7c96e8cf9a53277726bc90d23655-bc6173de5bd5d38d-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.893 UTC +367 ms preload (image) GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-ffeca39b939e34b6ca705b8fa93d91a7-f29029d79a8e7720-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.896 UTC +370 ms prefetch GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (17) 
{
  "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, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=4, i",
  "purpose": "prefetch",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "sec-purpose": "prefetch",
  "traceparent": "00-38aba2a3708103af988ec163756bcf35-19ae2337fc01415b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.908 UTC +382 ms JS GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-c99a6edf1f6c169ffcae4087c3a3d856-e0ff1bf934bcd59b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.912 UTC +386 ms image GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-bd08dfbcf242a0cb4d22ea175343a9bb-b8ad7b764780c96e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.912 UTC +386 ms ES module GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-85e790a2034cf78236f0f8dca55acab4-04eccf2f23dfd12e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:16.913 UTC +387 ms iframe document GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (16) 
{
  "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, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=0, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "iframe",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-0e4766e91a059a3db96262be277fe244-0c28a0d59047eec7-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:17.443 UTC +917 ms CSS @import (nested stylesheet) GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/HDvyE18U/style.css",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-9ba3a110cd164dca38d4849426887d9d-f3a0809c212b42e6-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:17.516 UTC +990 ms image inside iframe GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/r/HDvyE18U/iframe",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-0e4041abf062e10f880409fac736208b-f4eab31b33a18b6a-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:17.787 UTC +1261 ms CSS @font-face GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/HDvyE18U/style.css",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-5e39c830873d533cfdeb80b7c97bcf60-86ee6bffcf02ece2-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:17.940 UTC +1414 ms CSS background-image GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/r/HDvyE18U/style.css",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-9e639546575844aea2bf08f8015d6496-bf19edb1c64a4188-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:17.944 UTC +1418 ms JS executed beacon GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-3f0cb43e2a8da5619baa909c2303eb1e-f3addcf941499f87-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:18.074 UTC +1548 ms ES module executed GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-16bdf077abdb199c06be5e302cd605ca-0a869f6dac8a44b4-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:19.314 UTC +2788 ms client timing POST POST Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (17) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "content-length": "2147",
  "content-type": "application/json",
  "host": "uatracer.com",
  "priority": "u=4, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-fff045e55216b8e03255229fa801d5c8-8ec80c3daedb6764-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:19.388 UTC +2862 ms favicon GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=1, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-afb1efaab0a12b3a8159e655c74e70d5-ab6a134a45675cad-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-06-23 16:15:19.812 UTC +3286 ms apple-touch-icon GET Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "host": "uatracer.com",
  "priority": "u=1, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\", \"HeadlessChrome\";v=\"138\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Linux\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-3a765fe3aa338040689d834b0b90f695-7d7af30bbc49a018-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/138.0.7204.23 Safari/537.36",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}

Client-side resource waterfall

Reported by performance.getEntriesByType('resource') after JS ran in the UA. This proves a real browser-grade engine, not just a downloader.

ResourceInitiatorStartDurationTimeline
style.css link 466ms 553ms
font.woff2 link 467ms 292ms
preload.png link 467ms 1422ms
prefetch.png link 470ms 418ms
iframe iframe 485ms 1791ms
photo.png img 486ms 1033ms
main.js script 486ms 720ms
module.js script 486ms 886ms
import.css css 1020ms 282ms
js-ran.gif?t=1782231317710 img 1303ms 638ms
css-bg.png css 1306ms 493ms
css-font.woff2 css 1306ms 346ms
module-ran.gif?t=1782231317781 img 1374ms 700ms