ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
Trace onNAN43P
First seen: 2026-06-23 13:55:22.526 UTC
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
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 |
|---|---|---|---|---|
| 2026-06-23 13:55:22.526 UTC | +0 ms | homepage | GET | Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) |
request headers (9){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"traceparent": "00-d5b612ea62f4b5948ece497eae59fb62-20598543b45836d4-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-06-23 13:55:23.810 UTC | +1284 ms | CSS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
request headers (13){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-d313081d81d1454df00d0871f9058890-4c85a6e88b4b04a6-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-d313081d81d1454df00d0871f9058890-ba5f4e281330e844-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-06-23 13:55:24.397 UTC | +1871 ms | ES module | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
request headers (12){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-bed74df5d6dc1241dd1d1ef0cfe30808-f2494bc4c7d3158f-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-06-23 13:55:24.437 UTC | +1911 ms | JS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
request headers (13){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-be3c9adbb56461d5f3d90fd021ca71f8-3ea48edb93cdc38c-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-be3c9adbb56461d5f3d90fd021ca71f8-ef8dfc4f7b414b20-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-06-23 13:55:24.517 UTC | +1991 ms | prefetch | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
request headers (14){
"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",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-purpose": "prefetch",
"traceparent": "00-2f04ddf90064f61b346e3921ca931916-48c804c8f0707cab-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-2f04ddf90064f61b346e3921ca931916-7794c6a0c0744e33-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-06-23 13:55:24.909 UTC | +2383 ms | iframe document | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
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, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-ec81d1786e60bd6faaa77eeb8e379dd3-9a2eb7235e4016c4-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-06-23 13:55:26.593 UTC | +4067 ms | CSS @import (nested stylesheet) | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36 |
request headers (11){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/onNAN43P/style.css",
"traceparent": "00-02b1cc95f6612a0a61b11cbb97f303a8-aa8eb9e0dff865ec-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/148.0.7778.96 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-06-23 13:55:27.854 UTC | +5328 ms | favicon | GET | Googlebot-Image/1.0 |
request headers (9){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"traceparent": "00-1360f1956d791a245bab184e36d3e86a-5a104c2730abfa5a-01",
"tracestate": "",
"user-agent": "Googlebot-Image/1.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-06-23 13:55:27.974 UTC | +5448 ms | apple-touch-icon | GET | Googlebot-Image/1.0 |
request headers (11){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"connection": "keep-alive",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"traceparent": "00-544cc2b9bd1f2dc8cad77ed6d47220fb-1963264c3a789678-01",
"tracestate": "",
"user-agent": "Googlebot-Image/1.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-544cc2b9bd1f2dc8cad77ed6d47220fb-d8cba8c965da40f8-01",
"x-deno-userspace-tracestate": ""
}
|
||||