ua-tracer
by Paul Kinlan
trace zsaK99XH
what does a user agent actually fetch, follow & run?
Trace zsaK99XH
First seen: 2026-07-28 19:12:54.618 UTC
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Bot verification: ✓ verified Googlebot IP checked against published bot CIDR ranges; IP in Googlebot published range.
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 |
|---|---|---|---|---|
| 2026-07-28 19:12:54.618 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-f5b06440462abc1e7818f65ffc8744e9-03a8d10a42c63266-01",
"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"
}
|
||||
| 2026-07-28 19:12:59.506 UTC | +4888 ms | ES module | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36 |
request headers (13){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-8732dc619cc67e399a5d492574a20322-56f5c8150cd9489b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:01.124 UTC | +6506 ms | CSS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36 |
request headers (12){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-c9625127cffd95f21252345e55da8ef9-1fe0e3d4be28d390-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:03.058 UTC | +8440 ms | prefetch | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36 |
request headers (13){
"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",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-purpose": "prefetch",
"traceparent": "00-4a4867dc758911520b2583af5783ab5f-6d2f4176f017d489-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:03.739 UTC | +9121 ms | JS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36 |
request headers (12){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-c615c3e11942947f7f642e9fdeebd224-974e43f69b52c74a-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:04.102 UTC | +9484 ms | iframe document | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36 |
request headers (13){
"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",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-a689edfb482a03c8b93153754d58702a-53630200a6cbca17-01",
"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/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:04.610 UTC | +9992 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/150.0.7871.124 Safari/537.36 |
request headers (12){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"accept-language": "en-US",
"connection": "keep-alive",
"cookie": "ua-tracer-trace=zsaK99XH",
"from": "googlebot(at)googlebot.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/zsaK99XH/ecKGqCfK/style.css",
"traceparent": "00-a7657241341e1ac057c4092d029cec7e-53a5dca6103a30d6-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/150.0.7871.124 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-28 19:13:06.510 UTC | +11892 ms | favicon | 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-c62d15bc30413715deb35da4e42e3ce5-0d7d50e0934c0c25-01",
"tracestate": "",
"user-agent": "Googlebot-Image/1.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-c62d15bc30413715deb35da4e42e3ce5-3776a981167dc7ed-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-28 19:13:07.446 UTC | +12828 ms | apple-touch-icon | 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-b1a9321616ad0a492db42fa955256fa3-4373d40ff70a1b9d-01",
"tracestate": "",
"user-agent": "Googlebot-Image/1.0",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||