Diagnostic guides
Stable workflows for inspecting the evidence you already have. Each guide states what the source can support, what remains unknown, and which check should come next.
A guide earns its own URL only when it covers a distinct diagnostic job. Query variations stay inside the strongest relevant page.
Server log analysis without invented certainty
A practical workflow for turning Apache or Nginx access logs into a bounded request inventory before drawing SEO conclusions.
Analyse crawler traffic in access logs
Find declared search crawlers in server logs, verify identity where needed, and avoid confusing crawl activity with indexing.
Debug HTTP responses in evidence order
Inspect status, Location, canonical, robots directives, and rendered HTML without letting one signal stand in for the whole response.
Analyse redirect chains hop by hop
A bounded workflow for inspecting 301, 302, 307, and 308 responses, resolving Location fields, and identifying the check that comes next.
Test robots.txt rules in evidence order
Check delivery, product-token groups, exact path matching, and crawl-versus-indexing boundaries with a reproducible local workflow.
IP geolocation data: limits and safe use
Understand what an IP-location result can estimate, what it cannot establish, and which decisions need stronger evidence.