ua-tracer
by Paul Kinlan
trace ZXeh0a5o
what does a user agent actually fetch, follow & run?
Trace ZXeh0a5o
First seen: 2026-10-26 12:36:40.383 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 |
|---|---|---|---|---|
| 2026-10-26 12:36:40.383 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": "00-5f392d88eca8fa41c5b7fe41fac99f31-9fd91d254aee4324-01",
"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"
}
|
||||
| 2026-10-26 12:36:43.275 UTC | +2892 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-f458573746e843ec2f2222927c3161f3-449267d7e889ac21-01",
"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"
}
|
||||
| 2026-10-26 12:36:43.502 UTC | +3119 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": "00-141d42496a84cac22ca6a22580c42bb4-402b7809e39983c4-01",
"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"
}
|
||||
| 2026-10-26 12:37:23.451 UTC | +43068 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-a393f9e2340c8efdcf5dd972d76f9c80-1eda6243e5eb10ca-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"
}
|
||||
| 2026-10-26 12:37:23.455 UTC | +43072 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-a46fc2a4489c13cb4f7f5a0d4171dbf0-3e02e83424b6de2d-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"
}
|
||||
| 2026-10-26 12:37:25.149 UTC | +44766 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/ZXeh0a5o/Nx7zlJrj/iframe",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"traceparent": "00-edc12d87af5028b9cdb8f4daae17c13b-e75dedfdba16a163-01",
"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"
}
|
||||