tempo.halowerk.com – Font Render-Blocking Resources Check

Use this endpoint when you specifically need to audit render-blocking font resources on a webpage, as part of web performance analysis or Core Web Vitals optimization workflows. Prefer this over generic page-speed tools when you need a programmatic, per-check result that can be integrated into CI/CD pipelines or automated monitoring. Especially useful when diagnosing slow above-the-fold render times suspected to be caused by font loading.

• URL is not publicly accessible — returns an error or unreachable status
• URL is too long or malformed — rejected by schema validation (maxLength 2048)
• CSS selector matches no element or multiple elements — first match used or error returned
• Target page has no font resources — count returns zero
• Timeout fetching the target URL — may return a timeout or empty result
• Non-HTTP(S) URL provided — rejected by input validation