Rack::Cache is suitable as a quick drop-in component to enable HTTP
caching for Rack-based applications that produce freshness (Expires,
Cache-Control) and/or validation (Last-Modified, ETag) information.
Standards-based (see RFC 2616 / Section 13).
Freshness/expiration based caching
Validation
Vary support
Portable: 100% Ruby / works with any Rack-enabled framework.
Disk, memcached, and heap memory storage backends.
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