fiber.md

id	title	description	sidebar_position
fiber	📦 Fiber	Fiber represents the fiber package where you start to create an instance.	1

New

This method creates a new App named instance. You can pass optional config when creating a new instance.

func New(config ...Config) *App

// Default config
app := fiber.New()

// ...

Config

You can pass an optional Config when creating a new Fiber instance.

// Custom config
app := fiber.New(fiber.Config{
    Prefork:       true,
    CaseSensitive: true,
    StrictRouting: true,
    ServerHeader:  "Fiber",
    AppName: "Test App v1.0.1",
})

// ...

Config fields

Property	Type	Description	Default
AppName	string	This allows to setup app name for the app	""
BodyLimit	int	Sets the maximum allowed size for a request body, if the size exceeds the configured limit, it sends 413 - Request Entity Too Large response.	4 * 1024 * 1024
CaseSensitive	bool	When enabled, /Foo and /foo are different routes. When disabled, /Fooand /foo are treated the same.	false
ColorScheme	Colors	You can define custom color scheme. They'll be used for startup message, route list and some middlewares.	DefaultColors
CompressedFileSuffix	string	Adds a suffix to the original file name and tries saving the resulting compressed file under the new file name.	".fiber.gz"
Concurrency	int	Maximum number of concurrent connections.	256 * 1024
DisableDefaultContentType	bool	When set to true, causes the default Content-Type header to be excluded from the Response.	false
DisableDefaultDate	bool	When set to true causes the default date header to be excluded from the response.	false
DisableHeaderNormalizing	bool	By default all header names are normalized: conteNT-tYPE -> Content-Type	false
DisableKeepalive	bool	Disable keep-alive connections, the server will close incoming connections after sending the first response to the client	false
DisablePreParseMultipartForm	bool	Will not pre parse Multipart Form data if set to true. This option is useful for servers that desire to treat multipart form data as a binary blob, or choose when to parse the data.	false
DisableStartupMessage	bool	When set to true, it will not print out debug information	false
ETag	bool	Enable or disable ETag header generation, since both weak and strong etags are generated using the same hashing method (CRC-32). Weak ETags are the default when enabled.	false
EnableIPValidation	bool	If set to true, c.IP() and c.IPs() will validate IP addresses before returning them. Also, c.IP() will return only the first valid IP rather than just the raw header value that may be a comma seperated string. WARNING: There is a small performance cost to doing this validation. Keep disabled if speed is your only concern and your application is behind a trusted proxy that already validates this header.	false
EnablePrintRoutes	bool	EnablePrintRoutes enables print all routes with their method, path, name and handler..	false
EnableSplittingOnParsers	bool	EnableSplittingOnParsers splits the query/body/header parameters by comma when it's true. For example, you can use it to parse multiple values from a query parameter like this: /api?foo=bar,baz == foo[]=bar&foo[]=baz	false
EnableTrustedProxyCheck	bool	When set to true, fiber will check whether proxy is trusted, using TrustedProxies list. By default c.Protocol() will get value from X-Forwarded-Proto, X-Forwarded-Protocol, X-Forwarded-Ssl or X-Url-Scheme header, c.IP() will get value from ProxyHeader header, c.Hostname() will get value from X-Forwarded-Host header. If EnableTrustedProxyCheck is true, and RemoteIP is in the list of TrustedProxies c.Protocol(), c.IP(), and c.Hostname() will have the same behaviour when EnableTrustedProxyCheck disabled, if RemoteIP isn't in the list, c.Protocol() will return https in case when tls connection is handled by the app, or http otherwise, c.IP() will return RemoteIP() from fasthttp context, c.Hostname() will return fasthttp.Request.URI().Host()	false
ErrorHandler	ErrorHandler	ErrorHandler is executed when an error is returned from fiber.Handler. Mounted fiber error handlers are retained by the top-level app and applied on prefix associated requests.	DefaultErrorHandler
GETOnly	bool	Rejects all non-GET requests if set to true. This option is useful as anti-DoS protection for servers accepting only GET requests. The request size is limited by ReadBufferSize if GETOnly is set.	false
IdleTimeout	time.Duration	The maximum amount of time to wait for the next request when keep-alive is enabled. If IdleTimeout is zero, the value of ReadTimeout is used.	nil
Immutable	bool	When enabled, all values returned by context methods are immutable. By default, they are valid until you return from the handler; see issue #185.	false
JSONDecoder	utils.JSONUnmarshal	Allowing for flexibility in using another json library for decoding.	json.Unmarshal
JSONEncoder	utils.JSONMarshal	Allowing for flexibility in using another json library for encoding.	json.Marshal
Network	string	Known networks are "tcp", "tcp4" (IPv4-only), "tcp6" (IPv6-only) WARNING: When prefork is set to true, only "tcp4" and "tcp6" can be chosen.	NetworkTCP4
PassLocalsToViews	bool	PassLocalsToViews Enables passing of the locals set on a fiber.Ctx to the template engine. See our Template Middleware for supported engines.	false
Prefork	bool	Enables use of theSO_REUSEPORTsocket option. This will spawn multiple Go processes listening on the same port. learn more about socket sharding. NOTE: if enabled, the application will need to be ran through a shell because prefork mode sets environment variables. If you're using Docker, make sure the app is ran with CMD ./app or CMD ["sh", "-c", "/app"]. For more info, see this issue comment.	false
ProxyHeader	string	This will enable c.IP() to return the value of the given header key. By default c.IP()will return the Remote IP from the TCP connection, this property can be useful if you are behind a load balancer e.g. X-Forwarded-*.	""
ReadBufferSize	int	per-connection buffer size for requests' reading. This also limits the maximum header size. Increase this buffer if your clients send multi-KB RequestURIs and/or multi-KB headers (for example, BIG cookies).	4096
ReadTimeout	time.Duration	The amount of time allowed to read the full request, including the body. The default timeout is unlimited.	nil
RequestMethods	[]string	RequestMethods provides customizibility for HTTP methods. You can add/remove methods as you wish.	DefaultMethods
ServerHeader	string	Enables the Server HTTP header with the given value.	""
StreamRequestBody	bool	StreamRequestBody enables request body streaming, and calls the handler sooner when given body is larger than the current limit.	false
StrictRouting	bool	When enabled, the router treats /foo and /foo/ as different. Otherwise, the router treats /foo and /foo/ as the same.	false
TrustedProxies	[]string	Contains the list of trusted proxy IP's. Look at EnableTrustedProxyCheck doc. It can take IP or IP range addresses.	[]string*__*
UnescapePath	bool	Converts all encoded characters in the route back before setting the path for the context, so that the routing can also work with URL encoded special characters	false
Views	Views	Views is the interface that wraps the Render function. See our Template Middleware for supported engines.	nil
ViewsLayout	string	Views Layout is the global layout for all template render until override on Render function. See our Template Middleware for supported engines.	""
WriteBufferSize	int	Per-connection buffer size for responses' writing.	4096
WriteTimeout	time.Duration	The maximum duration before timing out writes of the response. The default timeout is unlimited.	nil
XMLEncoder	utils.XMLMarshal	Allowing for flexibility in using another XML library for encoding.	xml.Marshal

NewError

NewError creates a new HTTPError instance with an optional message.

func NewError(code int, message ...string) *Error

app.Get("/", func(c fiber.Ctx) error {
    return fiber.NewError(782, "Custom error message")
})

IsChild

IsChild determines if the current process is a result of Prefork.

func IsChild() bool

// Prefork will spawn child processes
app := fiber.New(fiber.Config{
    Prefork: true,
})

if !fiber.IsChild() {
    fmt.Println("I'm the parent process")
} else {
    fmt.Println("I'm a child process")
}

// ...