ua-tracer
by Paul Kinlan
trace 621xX3Cv
what does a user agent actually fetch, follow & run?
Trace 621xX3Cv
First seen: 2026-07-31 07:38:04.343 UTC
User-Agent: Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
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 |
|---|---|---|---|---|
| 2026-07-31 07:38:04.343 UTC | +0 ms | homepage | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (10){
"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",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"host": "uatracer.com",
"traceparent": "00-e7ca09406bca9b5a7e458e9859672984-fa9a9e5eb409d1ab-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-31 07:38:07.584 UTC | +3241 ms | prefetch | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
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",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-32e0d56c6dadd809873a7c8ad7819811-a9ca609c3881c122-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-32e0d56c6dadd809873a7c8ad7819811-9c076a3d2c11aee5-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:07.644 UTC | +3301 ms | ES module | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (14){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-fadda9efff687955243a3cc2832cac92-9788f18e646ad233-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-fadda9efff687955243a3cc2832cac92-2f51c4f0acdcc351-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:07.664 UTC | +3321 ms | preload (image) | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (11){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-80c5d721d912bd97e528a4c4c6cff10c-f3b4b436e9d346f6-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-31 07:38:07.692 UTC | +3349 ms | CSS | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-a84c2c338517143596d78a1461c33fe0-5f491b8478da9d68-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-a84c2c338517143596d78a1461c33fe0-8fd6e7cf7209ded0-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:07.724 UTC | +3381 ms | iframe document | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
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",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-8ca19f7d625696754b214cdb209bf4b7-780b01bfa16315da-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-8ca19f7d625696754b214cdb209bf4b7-33324ad2170fcbf2-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:07.740 UTC | +3397 ms | JS | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (11){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-847d11fbb763ace8163b5068ffdba56a-459f2d94520ba30d-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-07-31 07:38:07.792 UTC | +3449 ms | image | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-5371b1f83102ad0b2b1f444643bca545-e8fc203cc626403b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-5371b1f83102ad0b2b1f444643bca545-dabc396f4df2cba7-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:08.720 UTC | +4377 ms | font (HTML) | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (14){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-bcafed9669ef405f1c0bd30a25c0412f-e0ab9eb57780ef76-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-bcafed9669ef405f1c0bd30a25c0412f-f4f931ebd231312a-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:10.516 UTC | +6173 ms | CSS @import (nested stylesheet) | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/621xX3Cv/y2vfX0Tp/style.css",
"traceparent": "00-83f30c5a5f495b81dbf886b81b30b650-d9d27a45d7a79ec8-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-83f30c5a5f495b81dbf886b81b30b650-a43eb168182b23fa-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:10.800 UTC | +6457 ms | image inside iframe | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/621xX3Cv/y2vfX0Tp/iframe",
"traceparent": "00-6d444106de7f6b60d88b256bdfc2d5a4-0f5ce59f852d5d27-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-6d444106de7f6b60d88b256bdfc2d5a4-d763a6985fd23082-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:11.812 UTC | +7469 ms | CSS background-image | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/621xX3Cv/y2vfX0Tp/style.css",
"traceparent": "00-5d0de1d92d065bb627ba9fb0dd4e3311-185e988a79259fed-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-5d0de1d92d065bb627ba9fb0dd4e3311-02300a1c840a7466-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:11.856 UTC | +7513 ms | CSS @font-face | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (14){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/r/621xX3Cv/y2vfX0Tp/style.css",
"traceparent": "00-13384b1b9574c63ecd8f6c6b7fd3853f-6f5855ff00497793-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-13384b1b9574c63ecd8f6c6b7fd3853f-bbd1bb0583c3c985-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:11.896 UTC | +7553 ms | JS executed beacon | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-4737a998095cf6952c0be111e44c76cf-be9666f032e8b9dc-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-4737a998095cf6952c0be111e44c76cf-0fbeb4d5dd28068d-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:11.908 UTC | +7565 ms | CSP violation report (POST) | POST | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (16){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"content-length": "0",
"content-type": "application/json",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-54c7070c56670cbbac9b7ec591f85a41-9852f2054dd336be-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-54c7070c56670cbbac9b7ec591f85a41-a672f22e68dd3b38-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:12.016 UTC | +7673 ms | Reporting API report (POST) | POST | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (16){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"content-length": "0",
"content-type": "application/json",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-f36137c4ac7ddc5a177d643c97dc3bdf-f23153915f51bd96-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-f36137c4ac7ddc5a177d643c97dc3bdf-13b2c6c562276ebb-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:12.040 UTC | +7697 ms | ES module executed | GET | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (13){
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-209e29901d310ef4706dd9786f311a88-a792042887a01d1c-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-209e29901d310ef4706dd9786f311a88-b69ba597c7a00642-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-07-31 07:38:15.192 UTC | +10849 ms | client timing POST | POST | Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html) |
request headers (16){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh-CN,en;q=0.9,en-GB;q=0.8,en-US;q=0.7,fr;q=0.6",
"connection": "Close",
"content-length": "0",
"content-type": "application/json",
"cookie": "ua-tracer-trace=621xX3Cv",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-98441e00016c9b548d6095d1e5c4cf66-e4c228d1432b28c9-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-98441e00016c9b548d6095d1e5c4cf66-f2bc8cc7074bf406-01",
"x-deno-userspace-tracestate": ""
}
|
||||
Client-side resource waterfall
JS executed (beacon hit) but no resource-timing payload was posted (UA may block sendBeacon/fetch or strip the body).