ua-tracer
by Paul Kinlan
trace 1sIZv8KS
what does a user agent actually fetch, follow & run?
Trace 1sIZv8KS
First seen: 2026-11-04 16:00:47.390 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.
| Received | Δ | Kind | Method | User-Agent |
|---|---|---|---|---|
| 2026-11-04 16:00:47.390 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=:w3Ox1jieQpKNynxDFQ1avznFGzDIM/Mgl3RLguasYXZp1HzBYFVH99zp47up119NlFaiIBHnB++Ak7yKkHkcAQ==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808047;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808107;nonce=\"IN7H184cQfMMl6w32T0gQX_2yVHPdHoCNHqE1SnA1eiBAJSq-PwVgj07ImqmXCqbQoBkmvePflsRKLoJVRLFbg\";tag=\"web-bot-auth\"",
"traceparent": "00-c20287aab3761c7b8f96fe26f219d798-0b633bf46c31ddb2-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-c20287aab3761c7b8f96fe26f219d798-aafc969fd4839a13-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-11-04 16:02:47.081 UTC | +119691 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=:DOfyecxP6a8UIRMm7do5TFb7v+D/zIjtoO8Tq9qr/OKiXKT86gNubDVctkK8dzXiL9EiRdGskf2ADYs/y6S8BQ==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808165;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808225;nonce=\"SPrIBH_dslAOrzwIXym9KKOYtFgwlYVxJBmMa-zz-S_tN_z8aUORRttvNE17UiOOPFlrzkHPhlkcyG3lKbbRBg\";tag=\"web-bot-auth\"",
"traceparent": "00-4d51d54cc556b8d8f0fa8ac68c36abcc-913216cbb8f65ee4-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-11-04 16:02:48.236 UTC | +120846 ms | ES module | 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=:mPPOfsdT6wmgTWYMJRvT6y8TI1Y+D6OGmC/5cfADe3hJG72OBHro6DyttM7R0Y1NTl1bgZbbuwoNbxUNRIGGCQ==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808168;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808228;nonce=\"cA-_5cAmwZVyW187h4-hVjHsY5kaxlDTSzehwVX6RDhViaDHM6lR4g65WAHYO5XCtXEs449zfD8tk6PlHfy5jA\";tag=\"web-bot-auth\"",
"traceparent": "00-6d5963a7cfb18cd162f7c2ad509e5666-4aecd4bfaaf4b03c-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-11-04 16:02:49.299 UTC | +121909 ms | Open Graph image | 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=:tHwgYmbdas2cStCKtYXhpZ/5pLHj5lxZCJnuWvqoiiWBax6FS3DkKOI6TMzBXx2KhWLQ/9rcythW24wUm4OsCg==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808169;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808229;nonce=\"JuenzM-HEkv393CS20SMwlGYdVW9q7_6LIziQx0EneYLJU_OIOwtVKIL12RM-LMtedzZ0tDFCt0nYCOXzK8WkA\";tag=\"web-bot-auth\"",
"traceparent": "00-d1029385abd782af5c236a49321bcbdf-a202f3c07edb3118-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-d1029385abd782af5c236a49321bcbdf-9c40709f82336798-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-11-04 16:02:50.295 UTC | +122905 ms | image | 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=:UYQP5s6vY9hxloEmYOqcOVVyS9KVBIysmKFrPszpAZx6fWZLxb1lTkWy3GYGkI0vh9stHvCx1wuvuFVxuZxfDw==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808170;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808230;nonce=\"glZxmobxDP3SrZsZ-2r2UBGb9J6XSzhFVwe367SgzvGLn_thrG_zAc8eWQDWajttLKopmVw2oLksctY-4Sn9HQ\";tag=\"web-bot-auth\"",
"traceparent": "00-af5d5766d2d5306ebd9cf77dae657b79-6287662fb8d7398c-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-af5d5766d2d5306ebd9cf77dae657b79-6f05d00469f1dd43-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-11-04 16:02:51.287 UTC | +123897 ms | CSS | 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=:+HdbHdL8mlrZahfZsvUa2Cq9DH3XEtnKUsj5bkvE4H9nbcJrYxQE8CLwULVRXh/2G1ow60gAPwCc10LKPP/PCw==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1793808171;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1793808231;nonce=\"w7peKmFGfDU0wgbOp-AbZdknHvEepLkntTGZ2wm-uKUNmfxAez2XV8FlbcOt4tzBOvhYpSogRZC7rtHDdTkC5w\";tag=\"web-bot-auth\"",
"traceparent": "00-1e0328c5a8e257cc28cc440c76dec975-ac579ce3762789aa-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-1e0328c5a8e257cc28cc440c76dec975-a5eccfbc09faa15a-01",
"x-deno-userspace-tracestate": ""
}
|
||||