ua-tracer
by Paul Kinlan
trace lRE1loib
what does a user agent actually fetch, follow & run?
Trace lRE1loib
First seen: 2026-10-14 02:22:12.559 UTC
User-Agent: Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)
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 |
|---|---|---|---|---|
| 2026-10-14 02:22:12.559 UTC | +0 ms | homepage | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (14){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/heif,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.5",
"host": "uatracer.com",
"priority": "u=0, i",
"sec-fetch-dest": "document",
"sec-fetch-mode": "navigate",
"sec-fetch-site": "none",
"sec-fetch-user": "?1",
"traceparent": "00-bb3212693e34963fc946a17dcd55306e-6090f9faf01d4491-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:13.442 UTC | +883 ms | CSS | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (14){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "u=0",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "style",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-faa62e20af68c0a3350e68d153fcf9cb-a8fa7225a7b762d2-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:13.668 UTC | +1109 ms | preload (image) | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (15){
"accept": "image/heif,image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "identity",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "i",
"range": "bytes=0-499",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-5b2fa728a3a382d1ec2e4952a0ed5e12-cdef00966944cc98-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:13.897 UTC | +1338 ms | iframe document | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (15){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/heif,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "u=0, i",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "iframe",
"sec-fetch-mode": "navigate",
"sec-fetch-site": "same-origin",
"traceparent": "00-724d93901806fcf8e41314fce639be68-fcd1aaa3e07b89fa-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:13.907 UTC | +1348 ms | image | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (15){
"accept": "image/heif,image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "identity",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "i",
"range": "bytes=0-499",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-8855c9ed4641741e55ae4621b6c0ee83-cf9b7e101dfa4161-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:14.171 UTC | +1612 ms | CSS @import (nested stylesheet) | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (14){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "u=0",
"referer": "https://uatracer.com/r/lRE1loib/8HdUFMTZ/style.css",
"sec-fetch-dest": "style",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-0c7a550ba632bda2fa856ce498542237-16f0111beb9c266d-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:14.392 UTC | +1833 ms | image inside iframe | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (15){
"accept": "image/heif,image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "identity",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "i",
"range": "bytes=0-499",
"referer": "https://uatracer.com/r/lRE1loib/8HdUFMTZ/iframe",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-f13f1bbedd6ccbcd1482f7bea06c15a8-7de514fa28f43edd-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-14 02:22:14.643 UTC | +2084 ms | CSS background-image | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (15){
"accept": "image/heif,image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "identity",
"accept-language": "en-US,en;q=0.5",
"cookie": "[redacted]",
"host": "uatracer.com",
"priority": "i",
"range": "bytes=0-499",
"referer": "https://uatracer.com/r/lRE1loib/8HdUFMTZ/style.css",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-b1f33f87ce5d410271e64d85652b03cd-b6f49360af8b9130-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-16 03:39:05.932 UTC | +177413373 ms | image inside iframe | GET | Mozilla/5.0 (compatible; crawler) |
request headers (9){
"accept": "*/*",
"accept-encoding": "gzip, deflate",
"accept-language": "en-US",
"connection": "keep-alive",
"host": "uatracer.com",
"traceparent": "00-e2ca8016a1d455f9b84d625557494187-3e34cfc95d91b6cf-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; crawler)",
"via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-16 05:14:14.393 UTC | +183121834 ms | image | GET | Mozilla/5.0 (compatible; crawler) |
request headers (9){
"accept": "*/*",
"accept-encoding": "gzip, deflate",
"accept-language": "en-US",
"connection": "keep-alive",
"host": "uatracer.com",
"traceparent": "00-a4c5c9f5084f928ce48c7e7a6691926e-503026a16833cc82-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (compatible; crawler)",
"via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-16 18:54:33.178 UTC | +232340619 ms | iframe document | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
request headers (9){
"accept-encoding": "gzip,deflate",
"connection": "close",
"host": "uatracer.com",
"traceparent": "00-1e2010cd6e252cba5b5f6125bf9be1f4-0f639d09cb348cbb-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36",
"via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-1e2010cd6e252cba5b5f6125bf9be1f4-31d9975b3b369278-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-10-16 18:54:36.838 UTC | +232344279 ms | image inside iframe | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36 |
request headers (7){
"accept-encoding": "gzip,deflate",
"connection": "close",
"host": "uatracer.com",
"traceparent": "00-1e5914d17e415d9d0475ba7a2fcb807c-00bdec10a6e864f3-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.36",
"via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-24 19:15:00.169 UTC | +924767610 ms | Open Graph image | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (10){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh,zh-CN;q=0.9",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "document",
"traceparent": "00-5f22d94ef274e904d6546b8fa2c7fc7a-1e58312283eec562-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-25 10:50:50.586 UTC | +980918027 ms | image inside iframe | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (10){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh,zh-CN;q=0.9",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "document",
"traceparent": "00-47beae0353e13600479f4dafe35324ec-7cfff67b87d498d6-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-25 12:24:26.680 UTC | +986534121 ms | Twitter card image | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (10){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh,zh-CN;q=0.9",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "document",
"traceparent": "00-1aeb97f312cc2ed32656de7cc1a5c8e2-cbde16d0c19eeb0b-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-25 17:12:52.427 UTC | +1003839868 ms | image | GET | Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com) |
request headers (10){
"accept": "*/*",
"accept-encoding": "gzip",
"accept-language": "zh,zh-CN;q=0.9",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"sec-fetch-dest": "document",
"traceparent": "00-e573300957400d3ea08a34037dddf55f-cd85ec64e297e2d9-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-10-28 08:00:27.478 UTC | +1229894919 ms | iframe document | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Reflectionbot/1.0; +https://reflection.ai/bot) Chrome/151.0.0.0 Safari/537.36 |
request headers (15){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
"accept-encoding": "gzip,deflate,br",
"accept-language": "en-US,en;q=0.9",
"host": "uatracer.com",
"sec-fetch-dest": "document",
"sec-fetch-mode": "navigate",
"sec-fetch-site": "none",
"sec-fetch-user": "?1",
"traceparent": "00-27bb3f71fabc2170c9d74e1622434fc5-37055b51ceea8c59-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Reflectionbot/1.0; +https://reflection.ai/bot) Chrome/151.0.0.0 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-27bb3f71fabc2170c9d74e1622434fc5-56984db168dfd0b9-01",
"x-deno-userspace-tracestate": ""
}
|
||||