# Functions
MatrixQuery is an echo.MiddlewareFunc that verifies basic prerequisites that the request shall comply with and injects the formatted query request into echo.Context.
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PopulateCacheHeader populates the `Cache-Control`.
RequestMetadata is an echo.MiddlewareFunc that populates response.RequestMetadata and injects it into echo.Context.
SiteStatsQuery is an echo.MiddlewareFunc that verifies siteStats.Query parameters and inject to echo.Context.
# Constants
CacheTypeDynamic describes the resource as if it is a valuable-to-cache dynamic resource.
CacheTypeNoCache describes the resource should always not be cached.
CacheTypeStatic describes the resource should never be changed and therefore is safe for long-term caching.
# Type aliases
CacheType describes the type of cache shall be used, which its value is the content of the `Cache-Control` header that is being populated.