ua-tracer by Paul Kinlan

trace XBq2C0M2

ua-tracer

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

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Trace XBq2C0M2

First seen: 2026-07-26 19:57:10.069 UTC
User-Agent: Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
Bot verification: ⚠ NOT in Bingbot range (spoofed?) IP checked against published bot CIDR ranges; UA claims Bingbot but IP not in published range.

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
2026-07-26 19:57:10.069 UTC +0 ms homepage GET Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-4723f215e6d58128754b2d1972f5db37-eb445df75d5c1366-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-26 19:57:13.175 UTC +3106 ms JS GET Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-8c0f2bfabd03c32c07ac3fb5b11aaa72-d4a9d13eb8d82a6c-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-26 19:57:13.301 UTC +3232 ms ES module GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-eb6af5222d683491405c1a0fa9fdb621-dd9e52ee27095912-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}
2026-07-26 19:57:16.888 UTC +6819 ms web app manifest GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)
request headers (6) 
{
  "accept-encoding": "gzip",
  "host": "uatracer.com",
  "traceparent": "00-b8c10b099259292178ec5efdbeda50e0-fdce9ebaa32ff2f5-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net"
}