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add Cache304 as an alternative to the server-side kataras/iris/cache middleware - it can perform better with less server overheat but it comes with a cost of 304 instead of 200 so custom clients must make that check

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Former-commit-id: b0ba68c528c870fe060e2825c35689771a1d3680
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Gerasimos (Makis) Maropoulos
2018-01-25 16:19:45 +02:00
parent befb1f0c08
commit 969c2e87d4
8 changed files with 140 additions and 30 deletions
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23
iris.go
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@@ -360,11 +360,32 @@ var (
//
// A shortcut for the `handlerconv#FromStd`.
FromStd = handlerconv.FromStd
// Cache is a middleware providing cache functionalities
// Cache is a middleware providing server-side cache functionalities
// to the next handlers, can be used as: `app.Get("/", iris.Cache, aboutHandler)`.
// It should be used after Static methods.
// See `context#Cache304` for an alternative, faster way.
//
// Examples can be found at: https://github.com/kataras/iris/tree/master/_examples/#caching
Cache = cache.Handler
// Cache304 sends a `StatusNotModified` (304) whenever
// the "If-Modified-Since" request header (time) is before the
// time.Now() + expiresEvery (always compared to their UTC values).
// Use this, which is a shortcut of the, `context#Cache304` instead of the "github.com/kataras/iris/cache" or iris.Cache
// for better performance.
// Clients that are compatible with the http RCF (all browsers are and tools like postman)
// will handle the caching.
// The only disadvantage of using that instead of server-side caching
// is that this method will send a 304 status code instead of 200,
// So, if you use it side by side with other micro services
// you have to check for that status code as well for a valid response.
//
// Developers are free to extend this method's behavior
// by watching system directories changes manually and use of the `ctx.WriteWithExpiration`
// with a "modtime" based on the file modified date,
// simillary to the `StaticWeb`(StaticWeb sends an OK(200) and browser disk caching instead of 304).
//
// A shortcut of the `context#Cache304`.
Cache304 = context.Cache304
)
// SPA accepts an "assetHandler" which can be the result of an