Cachey is a high-performance read-through caching solution for object storage that employs a simple HTTP API and combines memory and disk caching. It is designed to efficiently cache immutable blobs and supports S3-compatible backends, utilizing features like page-aligned lookups, concurrent request coalescing, and hedged requests to optimize latency. The service also provides detailed metrics and throughput stats, and offers configurable options for memory and disk usage, as well as TLS support.