ua-tracer by Paul Kinlan

trace AnOzFNSW

ua-tracer

what does a user agent actually fetch, follow & run?

← all traces

Trace AnOzFNSW

First seen: 2026-07-06 04:21:09.405 UTC
User-Agent: Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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.

ReceivedΔKindMethodUser-Agent
2026-07-06 04:21:09.405 UTC +0 ms homepage GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "host": "uatracer.com",
  "priority": "u=0, i",
  "sec-fetch-dest": "document",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "none",
  "sec-fetch-user": "?1",
  "traceparent": "00-15c38bc70c323e781d4d48c61247e159-c2fa0a872d254795-01",
  "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; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:11.658 UTC +2253 ms CSS GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)
request headers (14) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "accept-language": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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": "00-7cfc8404fde8964f25f7d80dfe2759db-6e277ce1104a9d9e-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:11.882 UTC +2477 ms preload (image) GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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": "00-0c65d68aaad83be3836665c9b92a9496-feed84a6b1e8c2f1-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:12.109 UTC +2704 ms image GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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-d68bad2dfd65a51ef1f08d8e36469e4e-63664d8fde6fc3fd-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:12.152 UTC +2747 ms JS GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)
request headers (14) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "accept-language": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "host": "uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-e0ba17be0736f804d5bcb4a2cb0d5534-2d7b958271b2339b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:12.153 UTC +2748 ms iframe document GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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": "00-60814aa46180cf237c6bb50b843da3fa-9e186d083f8d3eb0-01",
  "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; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:12.154 UTC +2749 ms ES module GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)
request headers (15) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "accept-language": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-973777891b2c51f221caea78f16d76f8-c27af5c21771ff1c-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:12.551 UTC +3146 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; https://zhanzhang.toutiao.com/)
request headers (14) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "accept-language": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "host": "uatracer.com",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/AnOzFNSW/MmiU6IEz/style.css",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-62fadbc849f2b9b77e34db631b8cb5fa-92461c87e20104e1-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:13.028 UTC +3623 ms image inside iframe GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "host": "uatracer.com",
  "priority": "i",
  "range": "bytes=0-499",
  "referer": "https://uatracer.com/r/AnOzFNSW/MmiU6IEz/iframe",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-ee44771742193fcfb17f6299cac40967-96a2599a106c7b10-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:14.715 UTC +5310 ms CSS background-image GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "host": "uatracer.com",
  "priority": "i",
  "range": "bytes=0-499",
  "referer": "https://uatracer.com/r/AnOzFNSW/MmiU6IEz/style.css",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-be4a092f6a559ca3259ce8d09f739359-1233f7b18b7560a8-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:14.942 UTC +5537 ms ES module executed GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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": "00-28ed1a5628b5fb9f9292e91a7dabfdfb-33cccaf7ee87b0a3-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 04:21:14.984 UTC +5579 ms JS executed beacon GET Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.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": "zh,zh-CN;q=0.9",
  "cookie": "ua-tracer-trace=AnOzFNSW",
  "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": "00-697bb23e3f0b5ef2d96b95d9e3858b4e-dfc62b95a3362cbc-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; https://zhanzhang.toutiao.com/)",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}
2026-07-06 10:26:21.981 UTC +21912576 ms iframe document GET Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
request headers (6) 
{
  "accept": "*/*",
  "host": "uatracer.com",
  "traceparent": "00-6bedbcd9971353203584945705627c85-0f2c8fb6e5089d0d-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
  "via": "HTTP/2 ams.vultr.prod.deno-cluster.net"
}

Client-side resource waterfall

JS executed (beacon hit) but no resource-timing payload was posted (UA may block sendBeacon/fetch or strip the body).