ua-tracer
by Paul Kinlan
ua-tracer
what does a user agent actually fetch, follow & run?
Trace byIWcq4Z
First seen: 2026-06-26 12:51:20.749 UTC
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36
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 |
|---|---|---|---|---|
| 2026-06-26 12:51:20.749 UTC | +0 ms | homepage | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (7){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-b33e1b65ee49abbc99e03ba6c1624739-dddcc4dcc6a2ceb4-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
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| 2026-06-26 12:51:28.504 UTC | +7755 ms | web app manifest | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (7){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-6704f18d75e4852fc943035832926c1b-399bdaf4a9485d5a-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
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| 2026-06-26 12:51:30.876 UTC | +10127 ms | apple-touch-icon | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (9){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-ac81faee7348aad519884a08a8011ef8-45987ee65ca67e75-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-ac81faee7348aad519884a08a8011ef8-13850ea2d14db366-01",
"x-deno-userspace-tracestate": ""
}
|
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| 2026-06-26 12:51:37.668 UTC | +16919 ms | favicon | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (9){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-973a6b4d63e3744c09b015b20735a082-d8b5a0e035c7052b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-973a6b4d63e3744c09b015b20735a082-3fb0b07651ca6efd-01",
"x-deno-userspace-tracestate": ""
}
|
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| 2026-06-26 12:51:41.864 UTC | +21115 ms | font (HTML) | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (9){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-ab5007083fc8d72a1643e6bb8dd772e5-4c3ecdd0325ec20a-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-ab5007083fc8d72a1643e6bb8dd772e5-f35a57df104d8cb7-01",
"x-deno-userspace-tracestate": ""
}
|
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| 2026-06-26 12:51:43.140 UTC | +22391 ms | CSS | GET | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 |
request headers (9){
"accept-encoding": "gzip,deflate",
"connection": "Keep-Alive",
"host": "uatracer.com",
"traceparent": "00-bf7a7287faa2f12c6dea27c6f77ca53a-ba076ca06ee4874b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-bf7a7287faa2f12c6dea27c6f77ca53a-bbd78ca699893468-01",
"x-deno-userspace-tracestate": ""
}
|
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