ua-tracer by Paul Kinlan

ua-tracer

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

← all traces

Trace qJg1xlT0

First seen: 2026-07-03 05:05:23.587 UTC
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; YouBot/1.0; +https://docs.you.com/youbot; env:prod) Chrome/142.0.0.0 Safari/537.36
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
2026-07-03 05:05:23.587 UTC +0 ms homepage GET Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; YouBot/1.0; +https://docs.you.com/youbot; env:prod) Chrome/142.0.0.0 Safari/537.36
request headers (13) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br",
  "connection": "keep-alive",
  "host": "uatracer.com",
  "signature": "sig1=:MzLxeYYaMU3hDoGVcNaXQ4dAkqeXcbbH3dXJKuo6I4jBB6Tiux9qPy0MczbksyBLMAItQSpYHmd/LepmE2wUBQ==:",
  "signature-agent": "\"https://you.com\"",
  "signature-input": "sig1=(\"@authority\" \"signature-agent\");created=1783055123;expires=1783055723;keyid=\"5hbjTA0RjjhxRRquk32fSeRWfTgAdSHCZMK1afI1qvI\";alg=\"ed25519\";nonce=\"-p9KuiHJnxXzJNef0hFvhlR4g5O7M7m8E4xAWa0Je7g\";tag=\"web-bot-auth\"",
  "traceparent": "00-0e21b1467cc02037bb33a7fe92e77560-01586d72e7da004b-01",
  "tracestate": "",
  "user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; YouBot/1.0; +https://docs.you.com/youbot; env:prod) Chrome/142.0.0.0 Safari/537.36",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-0e21b1467cc02037bb33a7fe92e77560-1d636d9164f21d49-01",
  "x-deno-userspace-tracestate": ""
}