Technical SEO articles
Practical articles that answer one technical question in enough depth to support a real decision. No invented benchmarks, customers or field results.
Articles are dated and evidence-led. Stable procedures also live in Guides; changing protocol and crawler facts are tied to primary sources.
A 12-line crawler log: what the inspector finds and misses
A reproducible field note using one downloadable synthetic access log, exact local results and a spoofed Googlebot case the parser cannot verify.
What a 301 response does not prove
A 301 states that a resource has moved permanently. It does not prove destination quality, intent equivalence, or search-engine selection.
Private data can hide inside ordinary access logs
Access logs may contain addresses, identifiers, query values, referrers, and user agents. Minimise the sample before sharing or analysis.
robots.txt allows the bot. Why can the CDN still block it?
A practical diagnosis for pages that allow a crawler in robots.txt but return a firewall block, rate limit, login gate, or bot challenge.
Initial HTML and rendered DOM are different evidence
Learn what an HTTP crawler can prove from the initial response, what appears only after JavaScript runs, and how to compare the two without guessing.