ua-tracer
by Paul Kinlan
trace 8f9VSgSM
what does a user agent actually fetch, follow & run?
Trace 8f9VSgSM
First seen: 2026-09-10 15:08:37.218 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 |
|---|---|---|---|---|
| 2026-09-10 15:08:37.218 UTC | +0 ms | homepage | 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=:B0wfYC1dDab4K2MXvGZR89CVsqS2PvGb0Eum+JWXT7eIOGyVrYl7ILYj+IjMuez8cFiGapz0N2QGHQQdHHyxAg==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052916;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789052976;nonce=\"k-VeZx-a-Mh3mhJeLNh3Nhh3jcFrNwSuwpcCKKyd0mt7lVl3ucc5sUZ3-m7OB5lBeGZ2PJFAFtkzrPBGduWGAg\";tag=\"web-bot-auth\"",
"traceparent": "00-ecfc7e6f0bd0f204e3e5457f012809c1-8681f90f1192523c-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-09-10 15:09:52.426 UTC | +75208 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=:91133KC8LOPqLmCrwyw1GZKQZ68yqQzGUNdrrE46rbEBgv+PrqqOk0Fy35SDXE5X65yTieqcYLYuNQpkAsJjBw==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052992;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789053052;nonce=\"Og6nDsCxtBmsPSyTyj9D-h8CGxTO9N8XX24CzZ05wMOADtEeVgHTgfOUygEQ57lieLCVEwahIgkzUuJHAgspbQ\";tag=\"web-bot-auth\"",
"traceparent": "00-8f0585fa517c1e0a2a6206f3f570f598-4b189cce4f05f206-01",
"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": "00-8f0585fa517c1e0a2a6206f3f570f598-ab7534eb49778e7b-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-10 15:09:53.422 UTC | +76204 ms | JS | 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=:IXufwLzikhXyteHBqGxBdHXdf7nsTlCqrIvogum8TgVFZRKs1psFNPcZdrEHL7EjJDWkofH9tJlAVSSWSGjcCA==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052993;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789053053;nonce=\"V3NGI0MZXI7MIauucmHDdjlSSdQ8pbc71NeSxtr9h-VkP3rgweUqFxVEr0thE5K9Cg5nUxgKPqC1iqWaEtgNfg\";tag=\"web-bot-auth\"",
"traceparent": "00-c2205adbfdc76aa81c56fee2b730b7a5-af52543d3f3bc052-01",
"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-c2205adbfdc76aa81c56fee2b730b7a5-522828eaf4838028-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-10 15:09:54.336 UTC | +77118 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=:l2e5VOXy4Tb9fFMCpsgyz1iEQ02MrzJ2XsHAJJ5GkD29TAX5S4yPdRZnKy2XHcRXscqwDapfKXWt0Rv6xRi6Bg==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052994;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789053054;nonce=\"B_6m7T2SRUvtE8tp3ETjML0_RiPShp9Mj0poKifh2LIwokh3L1u1Tsixv6PPuq-QbwJBH0HgJdjMehWRfdEg1A\";tag=\"web-bot-auth\"",
"traceparent": "00-0c92f502186757933e87c621a680e105-c1559c7833deeebc-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": "00-0c92f502186757933e87c621a680e105-4b0a4487fe13fdad-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-10 15:09:55.379 UTC | +78161 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=:pzmfNXhPYuuKzlYE5XMOM/L8oEFQAoVx8+mDri1XrQMS1Mf6F2SwPfG737efdBRPe0bxxSXVTg0xY27jkupoDQ==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052995;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789053055;nonce=\"xj_xc7e1QcGkUMwwai5wOUL_9gMalRJcOYwNJIRe_ofBJ02P5w4KE4vvGkQpw5iyavR62b_jUIZQvvklxqfU6A\";tag=\"web-bot-auth\"",
"traceparent": "00-8d51c886d4cef0aeac0ccff16befe9b9-212bdf16dc1b9483-01",
"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": "00-8d51c886d4cef0aeac0ccff16befe9b9-4fb2fd19ccbb8f00-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-10 15:09:56.326 UTC | +79108 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=:Hx7I4h/m7xnhk/MeK6CTP7AJyN4OiVQ1dvzuO86BylO9eh4CEIpOKOCzUafwOzppY9y8fhbex/IXSSb/C6toBw==:",
"signature-agent": "\"https://ahrefs.com\"",
"signature-input": "sig=(\"@authority\" \"signature-agent\");created=1789052996;keyid=\"e3vpiy0B6M1Wdxnizw3dqRSgpqS6SXM2qiQ6HtUwZ5g\";alg=\"ed25519\";expires=1789053056;nonce=\"nTwXo6lRL26Tfq5USzJpjbiofifOvSl6RlcRN85ilWIpGV3hNwtsxmQ8WZ1EnTSqKq080UDObiYrCWG-WMvWwg\";tag=\"web-bot-auth\"",
"traceparent": "00-c0fa3453bf9f19e96bd294d6e52804d7-5a36c798b5437047-01",
"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-c0fa3453bf9f19e96bd294d6e52804d7-bf61104275fa0264-01",
"x-deno-userspace-tracestate": ""
}
|
||||