A notebook for the work.

An annotated request map connecting DNS, transport, TLS and application observations to six local field notes.

• Protocol maps
• HTTP
• Evidence notes

A comparison method for positive, negative and failed DNS answers, keeping resolver and timestamp alongside each observation.

• DNS
• TTL
• Failure classification

A review model for certificate identity, proxy trust and the header contract between an edge and its application.

• TLS
• nginx
• Trust boundaries

An illustrative fixture design for fresh hits, conditional validation and private responses; no live cache benchmark is claimed.

• HTTP caching
• ETag
• Response policies