aliases.go

package iris

import (
	"net/http"
	"path"
	"regexp"

	"github.com/kataras/iris/v12/cache"
	"github.com/kataras/iris/v12/context"
	"github.com/kataras/iris/v12/core/handlerconv"
	"github.com/kataras/iris/v12/core/host"
	"github.com/kataras/iris/v12/core/router"
	"github.com/kataras/iris/v12/hero"
	"github.com/kataras/iris/v12/view"
)

type (
	// Context is the middle-man server's "object" for the clients.
	//
	// A New context is being acquired from a sync.Pool on each connection.
	// The Context is the most important thing on the iris's http flow.
	//
	// Developers send responses to the client's request through a Context.
	// Developers get request information from the client's request by a Context.
	Context = *context.Context
	// ViewEngine is an alias of `context.ViewEngine`.
	// See HTML, Blocks, Django, Jet, Pug, Ace, Handlebars, Amber and e.t.c.
	ViewEngine = context.ViewEngine
	// UnmarshalerFunc a shortcut, an alias for the `context#UnmarshalerFunc` type
	// which implements the `context#Unmarshaler` interface for reading request's body
	// via custom decoders, most of them already implement the `context#UnmarshalerFunc`
	// like the json.Unmarshal, xml.Unmarshal, yaml.Unmarshal and every library which
	// follows the best practises and is aligned with the Go standards.
	//
	// See 'context#UnmarshalBody` for more.
	//
	// Example: https://github.com/kataras/iris/blob/master/_examples/request-body/read-custom-via-unmarshaler/main.go
	UnmarshalerFunc = context.UnmarshalerFunc
	// A Handler responds to an HTTP request.
	// It writes reply headers and data to the Context.ResponseWriter() and then return.
	// Returning signals that the request is finished;
	// it is not valid to use the Context after or concurrently with the completion of the Handler call.
	//
	// Depending on the HTTP client software, HTTP protocol version,
	// and any intermediaries between the client and the iris server,
	// it may not be possible to read from the Context.Request().Body after writing to the context.ResponseWriter().
	// Cautious handlers should read the Context.Request().Body first, and then reply.
	//
	// Except for reading the body, handlers should not modify the provided Context.
	//
	// If Handler panics, the server (the caller of Handler) assumes that the effect of the panic was isolated to the active request.
	// It recovers the panic, logs a stack trace to the server error log, and hangs up the connection.
	Handler = context.Handler
	// Filter is just a type of func(Context) bool which reports whether an action must be performed
	// based on the incoming request.
	//
	// See `NewConditionalHandler` for more.
	// An alias for the `context/Filter`.
	Filter = context.Filter
	// A Map is an alias of map[string]interface{}.
	Map = context.Map
	// Problem Details for HTTP APIs.
	// Pass a Problem value to `context.Problem` to
	// write an "application/problem+json" response.
	//
	// Read more at: https://github.com/kataras/iris/wiki/Routing-error-handlers
	//
	// It is an alias of the `context#Problem` type.
	Problem = context.Problem
	// ProblemOptions the optional settings when server replies with a Problem.
	// See `Context.Problem` method and `Problem` type for more details.
	//
	// It is an alias of the `context#ProblemOptions` type.
	ProblemOptions = context.ProblemOptions
	// JSON the optional settings for JSON renderer.
	//
	// It is an alias of the `context#JSON` type.
	JSON = context.JSON
	// JSONP the optional settings for JSONP renderer.
	//
	// It is an alias of the `context#JSONP` type.
	JSONP = context.JSONP
	// ProtoMarshalOptions is a type alias for protojson.MarshalOptions.
	ProtoMarshalOptions = context.ProtoMarshalOptions
	// ProtoUnmarshalOptions is a type alias for protojson.UnmarshalOptions.
	ProtoUnmarshalOptions = context.ProtoUnmarshalOptions
	// XML the optional settings for XML renderer.
	//
	// It is an alias of the `context#XML` type.
	XML = context.XML
	// Supervisor is a shortcut of the `host#Supervisor`.
	// Used to add supervisor configurators on common Runners
	// without the need of importing the `core/host` package.
	Supervisor = host.Supervisor

	// Party is just a group joiner of routes which have the same prefix and share same middleware(s) also.
	// Party could also be named as 'Join' or 'Node' or 'Group' , Party chosen because it is fun.
	//
	// Look the `core/router#APIBuilder` for its implementation.
	//
	// A shortcut for the `core/router#Party`, useful when `PartyFunc` is being used.
	Party = router.Party
	// APIContainer is a wrapper of a common `Party` featured by Dependency Injection.
	// See `Party.ConfigureContainer` for more.
	//
	// A shortcut for the `core/router#APIContainer`.
	APIContainer = router.APIContainer
	// ResultHandler describes the function type which should serve the "v" struct value.
	// See `APIContainer.UseResultHandler`.
	ResultHandler = hero.ResultHandler

	// DirOptions contains the optional settings that
	// `FileServer` and `Party#HandleDir` can use to serve files and assets.
	// A shortcut for the `router.DirOptions`, useful when `FileServer` or `HandleDir` is being used.
	DirOptions = router.DirOptions
	// DirCacheOptions holds the options for the cached file system.
	// See `DirOptions`.
	DirCacheOptions = router.DirCacheOptions
	// DirListRichOptions the options for the `DirListRich` helper function.
	// A shortcut for the `router.DirListRichOptions`.
	// Useful when `DirListRich` function is passed to `DirOptions.DirList` field.
	DirListRichOptions = router.DirListRichOptions
	// Attachments options for files to be downloaded and saved locally by the client.
	// See `DirOptions`.
	Attachments = router.Attachments
	// Dir implements FileSystem using the native file system restricted to a
	// specific directory tree, can be passed to the `FileServer` function
	// and `HandleDir` method. It's an alias of `http.Dir`.
	Dir = http.Dir

	// ExecutionRules gives control to the execution of the route handlers outside of the handlers themselves.
	// Usage:
	// Party#SetExecutionRules(ExecutionRules {
	//   Done: ExecutionOptions{Force: true},
	// })
	//
	// See `core/router/Party#SetExecutionRules` for more.
	// Example: https://github.com/kataras/iris/tree/master/_examples/mvc/middleware/without-ctx-next
	ExecutionRules = router.ExecutionRules
	// ExecutionOptions is a set of default behaviors that can be changed in order to customize the execution flow of the routes' handlers with ease.
	//
	// See `ExecutionRules` and `core/router/Party#SetExecutionRules` for more.
	ExecutionOptions = router.ExecutionOptions

	// CookieOption is the type of function that is accepted on
	// context's methods like `SetCookieKV`, `RemoveCookie` and `SetCookie`
	// as their (last) variadic input argument to amend the end cookie's form.
	//
	// Any custom or builtin `CookieOption` is valid,
	// see `CookiePath`, `CookieCleanPath`, `CookieExpires` and `CookieHTTPOnly` for more.
	//
	// An alias for the `context.CookieOption`.
	CookieOption = context.CookieOption
	// N is a struct which can be passed on the `Context.Negotiate` method.
	// It contains fields which should be filled based on the `Context.Negotiation()`
	// server side values. If no matched mime then its "Other" field will be sent,
	// which should be a string or []byte.
	// It completes the `context/context.ContentSelector` interface.
	//
	// An alias for the `context.N`.
	N = context.N
)

// Constants for input argument at `router.RouteRegisterRule`.
// See `Party#SetRegisterRule`.
const (
	// RouteOverride replaces an existing route with the new one, the default rule.
	RouteOverride = router.RouteOverride
	// RouteSkip keeps the original route and skips the new one.
	RouteSkip = router.RouteSkip
	// RouteError log when a route already exists, shown after the `Build` state,
	// server never starts.
	RouteError = router.RouteError
	// RouteOverlap will overlap the new route to the previous one.
	// If the route stopped and its response can be reset then the new route will be execute.
	RouteOverlap = router.RouteOverlap
)

// Contains the enum values of the `Context.GetReferrer()` method,
// shortcuts of the context subpackage.
const (
	ReferrerInvalid  = context.ReferrerInvalid
	ReferrerIndirect = context.ReferrerIndirect
	ReferrerDirect   = context.ReferrerDirect
	ReferrerEmail    = context.ReferrerEmail
	ReferrerSearch   = context.ReferrerSearch
	ReferrerSocial   = context.ReferrerSocial

	ReferrerNotGoogleSearch     = context.ReferrerNotGoogleSearch
	ReferrerGoogleOrganicSearch = context.ReferrerGoogleOrganicSearch
	ReferrerGoogleAdwords       = context.ReferrerGoogleAdwords
)

// NoLayout to disable layout for a particular template file
// A shortcut for the `view#NoLayout`.
const NoLayout = view.NoLayout

var (
	// HTML view engine.
	// Shortcut of the view.HTML.
	HTML = view.HTML
	// Blocks view engine.
	// Can be used as a faster alternative of the HTML engine.
	// Shortcut of the view.Blocks.
	Blocks = view.Blocks
	// Django view engine.
	// Shortcut of the view.Django.
	Django = view.Django
	// Handlebars view engine.
	// Shortcut of the view.Handlebars.
	Handlebars = view.Handlebars
	// Pug view engine.
	// Shortcut of the view.Pug.
	Pug = view.Pug
	// Amber view engine.
	// Shortcut of the view.Amber.
	Amber = view.Amber
	// Jet view engine.
	// Shortcut of the view.Jet.
	Jet = view.Jet
	// Ace view engine.
	// Shortcut of the view.Ace.
	Ace = view.Ace
)

// PrefixDir returns a new FileSystem that opens files
// by adding the given "prefix" to the directory tree of "fs".
func PrefixDir(prefix string, fs http.FileSystem) http.FileSystem {
	return &prefixedDir{prefix, fs}
}

type prefixedDir struct {
	prefix string
	fs     http.FileSystem
}

func (p *prefixedDir) Open(name string) (http.File, error) {
	name = path.Join(p.prefix, name)
	return p.fs.Open(name)
}

var (
	// Compression is a middleware which enables
	// writing and reading using the best offered compression.
	// Usage:
	// app.Use (for matched routes)
	// app.UseRouter (for both matched and 404s or other HTTP errors).
	Compression = func(ctx Context) {
		ctx.CompressWriter(true)
		ctx.CompressReader(true)
		ctx.Next()
	}

	// MatchImagesAssets is a simple regex expression
	// that can be passed to the DirOptions.Cache.CompressIgnore field
	// in order to skip compression on already-compressed file types
	// such as images and pdf.
	MatchImagesAssets = regexp.MustCompile("((.*).pdf|(.*).jpg|(.*).jpeg|(.*).gif|(.*).tif|(.*).tiff)$")
	// MatchCommonAssets is a simple regex expression which
	// can be used on `DirOptions.PushTargetsRegexp`.
	// It will match and Push
	// all available js, css, font and media files.
	// Ideal for Single Page Applications.
	MatchCommonAssets = regexp.MustCompile("((.*).js|(.*).css|(.*).ico|(.*).png|(.*).ttf|(.*).svg|(.*).webp|(.*).gif)$")
)

var (
	// RegisterOnInterrupt registers a global function to call when CTRL+C/CMD+C pressed or a unix kill command received.
	//
	// A shortcut for the `host#RegisterOnInterrupt`.
	RegisterOnInterrupt = host.RegisterOnInterrupt

	// LimitRequestBodySize is a middleware which sets a request body size limit
	// for all next handlers in the chain.
	//
	// A shortcut for the `context#LimitRequestBodySize`.
	LimitRequestBodySize = context.LimitRequestBodySize
	// NewConditionalHandler returns a single Handler which can be registered
	// as a middleware.
	// Filter is just a type of Handler which returns a boolean.
	// Handlers here should act like middleware, they should contain `ctx.Next` to proceed
	// to the next handler of the chain. Those "handlers" are registered to the per-request context.
	//
	//
	// It checks the "filter" and if passed then
	// it, correctly, executes the "handlers".
	//
	// If passed, this function makes sure that the Context's information
	// about its per-request handler chain based on the new "handlers" is always updated.
	//
	// If not passed, then simply the Next handler(if any) is executed and "handlers" are ignored.
	// Example can be found at: _examples/routing/conditional-chain.
	//
	// A shortcut for the `context#NewConditionalHandler`.
	NewConditionalHandler = context.NewConditionalHandler
	// FileServer returns a Handler which serves files from a specific system, phyisical, directory
	// or an embedded one.
	// The first parameter is the directory, relative to the executable program.
	// The second optional parameter is any optional settings that the caller can use.
	//
	// See `Party#HandleDir` too.
	// Examples can be found at: https://github.com/kataras/iris/tree/master/_examples/file-server
	// A shortcut for the `router.FileServer`.
	FileServer = router.FileServer
	// DirList is the default `DirOptions.DirList` field.
	// Read more at: `core/router.DirList`.
	DirList = router.DirList
	// DirListRich can be passed to `DirOptions.DirList` field
	// to override the default file listing appearance.
	// Read more at: `core/router.DirListRich`.
	DirListRich = router.DirListRich
	// StripPrefix returns a handler that serves HTTP requests
	// by removing the given prefix from the request URL's Path
	// and invoking the handler h. StripPrefix handles a
	// request for a path that doesn't begin with prefix by
	// replying with an HTTP 404 not found error.
	//
	// Usage:
	// fileserver := iris.FileServer("./static_files", DirOptions {...})
	// h := iris.StripPrefix("/static", fileserver)
	// app.Get("/static/{file:path}", h)
	// app.Head("/static/{file:path}", h)
	StripPrefix = router.StripPrefix
	// FromStd converts native http.Handler, http.HandlerFunc & func(w, r, next) to context.Handler.
	//
	// Supported form types:
	// 		 .FromStd(h http.Handler)
	// 		 .FromStd(func(w http.ResponseWriter, r *http.Request))
	// 		 .FromStd(func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc))
	//
	// A shortcut for the `handlerconv#FromStd`.
	FromStd = handlerconv.FromStd
	// 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 `iris#Cache304` for an alternative, faster way.
	//
	// Examples can be found at: https://github.com/kataras/iris/tree/master/_examples/#caching
	Cache = cache.Handler
	// NoCache is a middleware which overrides the Cache-Control, Pragma and Expires headers
	// in order to disable the cache during the browser's back and forward feature.
	//
	// A good use of this middleware is on HTML routes; to refresh the page even on "back" and "forward" browser's arrow buttons.
	//
	// See `iris#StaticCache` for the opposite behavior.
	//
	// A shortcut of the `cache#NoCache`
	NoCache = cache.NoCache
	// StaticCache middleware for caching static files by sending the "Cache-Control" and "Expires" headers to the client.
	// It accepts a single input parameter, the "cacheDur", a time.Duration that it's used to calculate the expiration.
	//
	// If "cacheDur" <=0 then it returns the `NoCache` middleware instaed to disable the caching between browser's "back" and "forward" actions.
	//
	// Usage: `app.Use(iris.StaticCache(24 * time.Hour))` or `app.Use(iris.StaticCache(-1))`.
	// A middleware, which is a simple Handler can be called inside another handler as well, example:
	// cacheMiddleware := iris.StaticCache(...)
	// func(ctx iris.Context){
	//  cacheMiddleware(ctx)
	//  [...]
	// }
	//
	// A shortcut of the `cache#StaticCache`
	StaticCache = cache.StaticCache
	// 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, `chache#Cache304` instead of the "github.com/kataras/iris/v12/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,
	// similar to the `HandleDir`(which sends status OK(200) and browser disk caching instead of 304).
	//
	// A shortcut of the `cache#Cache304`.
	Cache304 = cache.Cache304

	// CookieAllowReclaim accepts the Context itself.
	// If set it will add the cookie to (on `CookieSet`, `CookieSetKV`, `CookieUpsert`)
	// or remove the cookie from (on `CookieRemove`) the Request object too.
	//
	// A shortcut for the `context#CookieAllowReclaim`.
	CookieAllowReclaim = context.CookieAllowReclaim
	// CookieAllowSubdomains set to the Cookie Options
	// in order to allow subdomains to have access to the cookies.
	// It sets the cookie's Domain field (if was empty) and
	// it also sets the cookie's SameSite to lax mode too.
	//
	// A shortcut for the `context#CookieAllowSubdomains`.
	CookieAllowSubdomains = context.CookieAllowSubdomains
	// CookieSameSite sets a same-site rule for cookies to set.
	// SameSite allows a server to define a cookie attribute making it impossible for
	// the browser to send this cookie along with cross-site requests. The main
	// goal is to mitigate the risk of cross-origin information leakage, and provide
	// some protection against cross-site request forgery attacks.
	//
	// See https://tools.ietf.org/html/draft-ietf-httpbis-cookie-same-site-00 for details.
	//
	// A shortcut for the `context#CookieSameSite`.
	CookieSameSite = context.CookieSameSite
	// CookieSecure sets the cookie's Secure option if the current request's
	// connection is using TLS. See `CookieHTTPOnly` too.
	//
	// A shortcut for the `context#CookieSecure`.
	CookieSecure = context.CookieSecure
	// CookieHTTPOnly is a `CookieOption`.
	// Use it to set the cookie's HttpOnly field to false or true.
	// HttpOnly field defaults to true for `RemoveCookie` and `SetCookieKV`.
	//
	// A shortcut for the `context#CookieHTTPOnly`.
	CookieHTTPOnly = context.CookieHTTPOnly
	// CookiePath is a `CookieOption`.
	// Use it to change the cookie's Path field.
	//
	// A shortcut for the `context#CookiePath`.
	CookiePath = context.CookiePath
	// CookieCleanPath is a `CookieOption`.
	// Use it to clear the cookie's Path field, exactly the same as `CookiePath("")`.
	//
	// A shortcut for the `context#CookieCleanPath`.
	CookieCleanPath = context.CookieCleanPath
	// CookieExpires is a `CookieOption`.
	// Use it to change the cookie's Expires and MaxAge fields by passing the lifetime of the cookie.
	//
	// A shortcut for the `context#CookieExpires`.
	CookieExpires = context.CookieExpires
	// CookieEncoding accepts a value which implements `Encode` and `Decode` methods.
	// It calls its `Encode` on `Context.SetCookie, UpsertCookie, and SetCookieKV` methods.
	// And on `Context.GetCookie` method it calls its `Decode`.
	//
	// A shortcut for the `context#CookieEncoding`.
	CookieEncoding = context.CookieEncoding

	// IsErrPath can be used at `context#ReadForm` and `context#ReadQuery`.
	// It reports whether the incoming error is type of `formbinder.ErrPath`,
	// which can be ignored when server allows unknown post values to be sent by the client.
	//
	// A shortcut for the `context#IsErrPath`.
	IsErrPath = context.IsErrPath
	// ErrEmptyForm is the type error which API users can make use of
	// to check if a form was empty on `Context.ReadForm`.
	//
	// A shortcut for the `context#ErrEmptyForm`.
	ErrEmptyForm = context.ErrEmptyForm
	// ErrEmptyFormField reports whether if form value is empty.
	// An alias of `context.ErrEmptyFormField`.
	ErrEmptyFormField = context.ErrEmptyFormField
	// ErrNotFound reports whether a key was not found, useful
	// on post data, versioning feature and others.
	// An alias of `context.ErrNotFound`.
	ErrNotFound = context.ErrNotFound
	// NewProblem returns a new Problem.
	// Head over to the `Problem` type godoc for more.
	//
	// A shortcut for the `context#NewProblem`.
	NewProblem = context.NewProblem
	// XMLMap wraps a map[string]interface{} to compatible xml marshaler,
	// in order to be able to render maps as XML on the `Context.XML` method.
	//
	// Example: `Context.XML(XMLMap("Root", map[string]interface{}{...})`.
	//
	// A shortcut for the `context#XMLMap`.
	XMLMap = context.XMLMap
	// ErrStopExecution if returned from a hero middleware or a request-scope dependency
	// stops the handler's execution, see _examples/dependency-injection/basic/middleware.
	ErrStopExecution = hero.ErrStopExecution
	// ErrHijackNotSupported is returned by the Hijack method to
	// indicate that Hijack feature is not available.
	//
	// A shortcut for the `context#ErrHijackNotSupported`.
	ErrHijackNotSupported = context.ErrHijackNotSupported
	// ErrPushNotSupported is returned by the Push method to
	// indicate that HTTP/2 Push support is not available.
	//
	// A shortcut for the `context#ErrPushNotSupported`.
	ErrPushNotSupported = context.ErrPushNotSupported
)

// HTTP Methods copied from `net/http`.
const (
	MethodGet     = http.MethodGet
	MethodPost    = http.MethodPost
	MethodPut     = http.MethodPut
	MethodDelete  = http.MethodDelete
	MethodConnect = http.MethodConnect
	MethodHead    = http.MethodHead
	MethodPatch   = http.MethodPatch
	MethodOptions = http.MethodOptions
	MethodTrace   = http.MethodTrace
	// MethodNone is an iris-specific "virtual" method
	// to store the "offline" routes.
	MethodNone = router.MethodNone
)

// HTTP status codes as registered with IANA.
// See: http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml.
// Raw Copy from the future(tip) net/http std package in order to recude the import path of "net/http" for the users.
const (
	StatusContinue             = http.StatusContinue
	StatusSwitchingProtocols   = http.StatusSwitchingProtocols
	StatusProcessing           = http.StatusProcessing
	StatusEarlyHints           = http.StatusEarlyHints
	StatusOK                   = http.StatusOK
	StatusCreated              = http.StatusCreated
	StatusAccepted             = http.StatusAccepted
	StatusNonAuthoritativeInfo = http.StatusNonAuthoritativeInfo
	StatusNoContent            = http.StatusNoContent
	StatusResetContent         = http.StatusResetContent
	StatusPartialContent       = http.StatusPartialContent
	StatusMultiStatus          = http.StatusMultiStatus
	StatusAlreadyReported      = http.StatusAlreadyReported
	StatusIMUsed               = http.StatusIMUsed

	StatusMultipleChoices  = http.StatusMultipleChoices
	StatusMovedPermanently = http.StatusMovedPermanently
	StatusFound            = http.StatusFound
	StatusSeeOther         = http.StatusSeeOther
	StatusNotModified      = http.StatusNotModified
	StatusUseProxy         = http.StatusUseProxy

	StatusTemporaryRedirect = http.StatusTemporaryRedirect
	StatusPermanentRedirect = http.StatusPermanentRedirect

	StatusBadRequest                   = http.StatusBadRequest
	StatusUnauthorized                 = http.StatusUnauthorized
	StatusPaymentRequired              = http.StatusPaymentRequired
	StatusForbidden                    = http.StatusForbidden
	StatusNotFound                     = http.StatusNotFound
	StatusMethodNotAllowed             = http.StatusMethodNotAllowed
	StatusNotAcceptable                = http.StatusNotAcceptable
	StatusProxyAuthRequired            = http.StatusProxyAuthRequired
	StatusRequestTimeout               = http.StatusRequestTimeout
	StatusConflict                     = http.StatusConflict
	StatusGone                         = http.StatusGone
	StatusLengthRequired               = http.StatusLengthRequired
	StatusPreconditionFailed           = http.StatusPreconditionFailed
	StatusRequestEntityTooLarge        = http.StatusRequestEntityTooLarge
	StatusPayloadTooRage               = StatusRequestEntityTooLarge
	StatusRequestURITooLong            = http.StatusRequestURITooLong
	StatusUnsupportedMediaType         = http.StatusUnsupportedMediaType
	StatusRequestedRangeNotSatisfiable = http.StatusRequestedRangeNotSatisfiable
	StatusExpectationFailed            = http.StatusExpectationFailed
	StatusTeapot                       = http.StatusTeapot
	StatusMisdirectedRequest           = http.StatusMisdirectedRequest
	StatusUnprocessableEntity          = http.StatusUnprocessableEntity
	StatusLocked                       = http.StatusLocked
	StatusFailedDependency             = http.StatusFailedDependency
	StatusTooEarly                     = http.StatusTooEarly
	StatusUpgradeRequired              = http.StatusUpgradeRequired
	StatusPreconditionRequired         = http.StatusPreconditionRequired
	StatusTooManyRequests              = http.StatusTooManyRequests
	StatusRequestHeaderFieldsTooLarge  = http.StatusRequestHeaderFieldsTooLarge
	StatusUnavailableForLegalReasons   = http.StatusUnavailableForLegalReasons
	// Unofficial Client Errors.
	StatusPageExpired                      = context.StatusPageExpired
	StatusBlockedByWindowsParentalControls = context.StatusBlockedByWindowsParentalControls
	StatusInvalidToken                     = context.StatusInvalidToken
	StatusTokenRequired                    = context.StatusTokenRequired
	//
	StatusInternalServerError           = http.StatusInternalServerError
	StatusNotImplemented                = http.StatusNotImplemented
	StatusBadGateway                    = http.StatusBadGateway
	StatusServiceUnavailable            = http.StatusServiceUnavailable
	StatusGatewayTimeout                = http.StatusGatewayTimeout
	StatusHTTPVersionNotSupported       = http.StatusHTTPVersionNotSupported
	StatusVariantAlsoNegotiates         = http.StatusVariantAlsoNegotiates
	StatusInsufficientStorage           = http.StatusInsufficientStorage
	StatusLoopDetected                  = http.StatusLoopDetected
	StatusNotExtended                   = http.StatusNotExtended
	StatusNetworkAuthenticationRequired = http.StatusNetworkAuthenticationRequired
	// Unofficial Server Errors.
	StatusBandwidthLimitExceeded = context.StatusBandwidthLimitExceeded
	StatusInvalidSSLCertificate  = context.StatusInvalidSSLCertificate
	StatusSiteOverloaded         = context.StatusSiteOverloaded
	StatusSiteFrozen             = context.StatusSiteFrozen
	StatusNetworkReadTimeout     = context.StatusNetworkReadTimeout
)

// StatusText returns a text for the HTTP status code. It returns the empty
// string if the code is unknown.
//
// Shortcut for core/router#StatusText.
var StatusText = context.StatusText