Public URL Requirement
External performance testing services require a publicly reachable website URL in order to analyze loading behavior, caching, scripts, images, and response performance correctly. If the testing system cannot access the website normally, performance scans may fail or return incomplete results.
Most external testing services normally will not test:
localhost
private staging subdomains behind auth
local development domains
sites blocked by maintenance mode or firewall challenges
Common Access Restrictions That Prevent Testing
Many staging environments and development websites intentionally block public access using passwords, maintenance systems, VPN restrictions, firewall rules, or authentication layers. While this improves security, it also prevents external performance scanners from loading the website correctly.
If a performance tool cannot access the site, temporarily verify that the URL is publicly reachable before assuming the testing service itself is failing.
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