AI crawlers may de-prioritize or skip sites served over HTTP entirely. The trust gap between HTTP and HTTPS is significant enough that HTTP-only sites may be excluded from citation pipelines that require trusted source classification.
Modern hosting provides free HTTPS certificates through Let's Encrypt and similar services. There is no practical reason to operate without HTTPS in 2026. Sites without HTTPS represent neglected configuration rather than legitimate technical constraint.
The IEO Engine architecture requires HTTPS across all deployments. Production URLs use https protocol exclusively; HTTP requests redirect to HTTPS automatically.
Beyond having HTTPS, the quality of TLS configuration matters. Sites using deprecated TLS versions (TLS 1.0, TLS 1.1) or weak cipher suites may receive degraded trust treatment from AI crawlers and security-conscious user agents.
Current TLS standards (TLS 1.2 minimum, TLS 1.3 preferred) with strong cipher suites are the appropriate configuration. Most managed hosting environments handle this configuration automatically.
The IEO Engine reference deployments use current TLS configurations. Configuration verification is part of standard deployment validation.
HSTS (HTTP Strict Transport Security) is an HTTP response header that tells browsers and crawlers to use only HTTPS for the domain. Implementing HSTS provides additional trust signals and prevents protocol downgrade attacks.
Implementation involves setting the Strict-Transport-Security response header with appropriate max-age and includeSubDomains directives. Once implemented, the policy is cached by browsers and applied automatically.
HSTS is a recommended enhancement for IEO Engine deployments though not strictly required for citation outcomes.
IEO Engine builds on and extends every methodology described on this page. Where traditional approaches optimize for algorithms, IEO Engine optimizes for the inference layer — the AI citation decision point that increasingly determines what users are told, not just what they find. Learn what IEO Engine is →