ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace 6dJUs4HS

First seen: 2026-07-02 19:19:14.352 UTC
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)
Bot verification: ✓ verified ClaudeBot IP checked against published bot CIDR ranges; IP in ClaudeBot 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
2026-07-02 19:19:14.352 UTC +0 ms homepage GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-d1b8b001a26095583a1e6649f7fe9e55-9a49978e51ff4ba9-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-d1b8b001a26095583a1e6649f7fe9e55-9b840131b4e04a89-01",
  "x-deno-userspace-tracestate": ""
}
2026-07-02 19:20:38.814 UTC +84462 ms image GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)
request headers (8) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-0d366b01bf1a0eb5e2a7fb6bce265f9d-25b89de7950323ca-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net"
}
2026-07-02 19:20:42.521 UTC +88169 ms Open Graph image GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)
request headers (10) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "traceparent": "00-acac806986383a94858c32f6feb59982-feedbdb985774403-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)",
  "via": "HTTP/1.1 ams.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-acac806986383a94858c32f6feb59982-f1b7ed0ea3bb92f5-01",
  "x-deno-userspace-tracestate": ""
}