ua-tracer by Paul Kinlan

trace CPBYcnmx

ua-tracer

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

← all traces

Trace CPBYcnmx

First seen: 2026-07-27 14:44:27.917 UTC
User-Agent: Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
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
2026-07-27 14:44:27.917 UTC +0 ms homepage GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:nFSRPmEzzeB+JxBz9LrLjtqSXs4k2Kl/yvaaftvDNSn2dlou0Vz35oB8d7Adph6rGmbBLpXUvbjNXq+B43ePDw==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163467;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163527;nonce=\"t51iKy3R_3u4AkL0uzf4tx8JJmmgASUUAN8mS7kMIOUTlQ0YIQMuuQEsBehU3EYkAQHGAGsHayy8AeqNKuiVaw\";tag=\"web-bot-auth\"",
  "traceparent": "00-c6c51b522a19da6e9ab987f13f2e840e-ea8de37a6edb7ef5-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-c6c51b522a19da6e9ab987f13f2e840e-9c1de181b8496dc6-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:31.253 UTC +3336 ms CSS GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (15) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-f7207a1ce47756b1f21c393a533e5415-62d79948c9f5057d-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-f7207a1ce47756b1f21c393a533e5415-56d2ce98d0243a48-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:31.256 UTC +3339 ms JS GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-bffab99eceb558c0d4e93f3bd91d6c10-18f1f68f8b32e4e6-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-bffab99eceb558c0d4e93f3bd91d6c10-e3f329d8de4be593-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:31.256 UTC +3339 ms iframe document GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
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",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "priority": "u=0, i",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "iframe",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-5c88b0559c4d509a352deeb89bdb1fa3-9dd18bb7f9177428-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-5c88b0559c4d509a352deeb89bdb1fa3-011b98270df1694c-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:31.257 UTC +3340 ms ES module GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-31b0b24045cf2faf01169b5620c14860-83092239b8a2a7df-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-31b0b24045cf2faf01169b5620c14860-a6d4b5733460decc-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:31.257 UTC +3340 ms font (HTML) GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-90bf8775d5e4362b4c69cdb30cc2e060-4cbabc3979575185-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-90bf8775d5e4362b4c69cdb30cc2e060-92ed4fe1f64c8a51-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:32.115 UTC +4198 ms CSS @import (nested stylesheet) GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (15) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/CPBYcnmx/6DTYQ14W/style.css",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-725a3642d4304bdbe0af8b35fc6be30d-c49dee3226e3d9b2-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-725a3642d4304bdbe0af8b35fc6be30d-0624c32d8eabdc97-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:33.799 UTC +5882 ms CSS @font-face GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (16) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/CPBYcnmx/6DTYQ14W/style.css",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-2acd8f56a3456cb3b37228ee70754c34-09ef3926e72eea00-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-2acd8f56a3456cb3b37228ee70754c34-836cad614d726f48-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:44:35.225 UTC +7308 ms client timing POST POST Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (18) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "content-length": "2211",
  "content-type": "application/json",
  "cookie": "ua-tracer-trace=CPBYcnmx",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=4, i",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-a52f35b1f18844639a92d5cd857472ba-9866168c0f6762b1-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-a52f35b1f18844639a92d5cd857472ba-18b2866c17c13e37-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:46:45.787 UTC +137870 ms Open Graph image GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:bB3LcBR/qYUgWDR7un2nQz+FpxMZbfRkZA/HzuurAFh2uajgEcusv8hv2BonzlPRniyJqUrId9MzedxgSYh7Bw==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163605;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163665;nonce=\"K3ooq977elXxCusuqCDfbBBU52ubp8ubMoEbzr6eeBKF2C5IhYzwCLYriKNANzD8RTqgbfmBkbB4_Ka_4qNtkw\";tag=\"web-bot-auth\"",
  "traceparent": "00-152b72808e4a2bfd3690e9d8ea286835-47deb612e3805687-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-27 14:46:47.382 UTC +139465 ms ES module GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (12) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:ir0ZiNdnQ44sE51ZSHcd6H+bg1uwgoVQClINR2XojnPoWfDNuJV1Ls9VN6J+sgICtL9U1qsWsOq/ljfbaKd8Dg==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163607;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163667;nonce=\"Y6g0oaZCmPIaUobSbMr59TWVTlRedbIcVcjJnDBH49AWltGowGv2hgTelpYsnE1HqOxKQjsyr8gFdWpzPp-89g\";tag=\"web-bot-auth\"",
  "traceparent": "00-ed4503567af4d0eb0bc489872fbfb827-21e1fb17c77cdb96-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-ed4503567af4d0eb0bc489872fbfb827-af6ce79557025848-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-27 14:46:49.235 UTC +141318 ms image GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:KCIoPDDdqzR8dNhJm6Re+knWTuDiuZ5FBEQ43kdcLjb1ya6hyRLXSS0nZb/av9Ze6DQDTy80OWX1AQ06AyEtCw==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163608;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163668;nonce=\"yYYfTTxWiBhihpwdk_Ani4KioM-DoinzeV8w9cfPkqqNgnNZ8oeDeJPPCs1bv_5ZvsHjHQZ1KIsQ40pmfUMMVg\";tag=\"web-bot-auth\"",
  "traceparent": "00-587eb6908248687e33fd284d0b9b6db2-68de3e2ddc28a241-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-27 14:46:50.404 UTC +142487 ms JS GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:V85gmaRIXbEKVOLw+ukdCv92uADmOWUvzfttquQ79IduOqd/haIkOr/eKMUxpq2edsGGl4PQR48MpBbtqUaRAg==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163610;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163670;nonce=\"MYt1_-Zm-w5KtESOxkd5E6oDRpR2FQMgbyeZADirXPwa3nFaHkNIohsj36HRmF6OwoVvTv5YeSsw-Ug9AGrygw\";tag=\"web-bot-auth\"",
  "traceparent": "00-601666dd13f1f330752fa94ae9e9d1c2-cd1626c2bc108168-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-27 14:46:51.634 UTC +143717 ms CSS GET Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "deflate, gzip, br, zstd",
  "host": "uatracer.com",
  "signature": "sig=:rzCo4lzx3VJHn1MFfeMLSGz+nVgNdVj97xdJwKIzKMVLss154+FsoNEG5xAYweRM3YbIjDUGtcnOtUDvtn/FDQ==:",
  "signature-agent": "\"https://ahrefs.com\"",
  "signature-input": "sig=(\"@authority\" \"signature-agent\");created=1785163611;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1785163671;nonce=\"grDkreTKViKzMmtalG_F3XyxSZ2FOd-GF-Tifycu-zhDmOebOPtTgzK2Jb9TFL-j2-X0EWq6kE-5qLBKOcGcDA\";tag=\"web-bot-auth\"",
  "traceparent": "00-6c51c68a30ef697361cbe24548278c65-e74c409724a9a269-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
  "via": "HTTP/2 ams.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 4ms 1407ms
preload.png link 4ms 3ms
font.woff2 link 4ms 2417ms
photo.png img 5ms 3ms
module.js script 5ms 2084ms
main.js script 5ms 2813ms
prefetch.png link 7ms 2ms
iframe iframe 9ms 1660ms
import.css css 1412ms 1791ms
js-ran.gif?t=1785163473724 img 3205ms 1ms
css-bg.png css 3205ms 11ms
css-font.woff2 css 3205ms 750ms
module-ran.gif?t=1785163473735 img 3216ms 1ms