description: The app instance conventionally denotes the Fiber application.

🚀 App

Static

Use the Static method to serve static files such as images, CSS, and JavaScript.

By default, Static will serve index.html files in response to a request on a directory.

func (app *App) Static(prefix, root string, config ...Static) Router

Use the following code to serve files in a directory named ./public

app.Static("/", "./public")
// => http://localhost:3000/hello.html
// => http://localhost:3000/js/jquery.js
// => http://localhost:3000/css/style.css

// Serve files from multiple directories
app.Static("/", "./public")
// Serve files from "./files" directory:
app.Static("/", "./files")

You can use any virtual path prefix (where the path does not actually exist in the file system) for files that are served by the Static method, specify a prefix path for the static directory, as shown below:

app.Static("/static", "./public")
// => http://localhost:3000/static/hello.html
// => http://localhost:3000/static/js/jquery.js
// => http://localhost:3000/static/css/style.css

If you want to have a little bit more control regarding the settings for serving static files. You could use the fiber.Static struct to enable specific settings.

// Static defines configuration options when defining static assets.
type Static struct {
    // When set to true, the server tries minimizing CPU usage by caching compressed files.
    // This works differently than the github.com/gofiber/compression middleware.
    // Optional. Default value false
    Compress bool `json:"compress"`
    // When set to true, enables byte range requests.
    // Optional. Default value false
    ByteRange bool `json:"byte_range"`
    // When set to true, enables directory browsing.
    // Optional. Default value false.
    Browse bool `json:"browse"`
    // The name of the index file for serving a directory.
    // Optional. Default value "index.html".
    Index string `json:"index"`
    // Expiration duration for inactive file handlers.
    // Use a negative time.Duration to disable it.
    //
    // Optional. Default value 10 * time.Second.
    CacheDuration time.Duration `json:"cache_duration"`
    // The value for the Cache-Control HTTP-header
    // that is set on the file response. MaxAge is defined in seconds.
    //
    // Optional. Default value 0.
    MaxAge int `json:"max_age"`
    // Next defines a function to skip this middleware when returned true.
    //
    // Optional. Default: nil
    Next func(c *Ctx) bool
}

// Custom config
app.Static("/", "./public", fiber.Static{
  Compress:      true,
  ByteRange:     true,
  Browse:        true,
  Index:         "john.html"
  CacheDuration: 10 * time.Second,
  MaxAge:        3600,
})

Route Handlers

Registeres a route bound to a specific HTTP method.

// HTTP methods
func (app *App) Get(path string, handlers ...Handler) Router
func (app *App) Head(path string, handlers ...Handler) Router
func (app *App) Post(path string, handlers ...Handler) Router
func (app *App) Put(path string, handlers ...Handler) Router
func (app *App) Delete(path string, handlers ...Handler) Router
func (app *App) Connect(path string, handlers ...Handler) Router
func (app *App) Options(path string, handlers ...Handler) Router
func (app *App) Trace(path string, handlers ...Handler) Router
func (app *App) Patch(path string, handlers ...Handler) Router
// Add allows you to specifiy a method as value
func (app *App) Add(method, path string, handlers ...Handler) Router
// All will register the route on all HTTP methods
// Almost the same as app.Use but not bound to prefixes
func (app *App) All(path string, handlers ...Handler) Router

// Simple GET handler
app.Get("/api/list", func(c *fiber.Ctx)error{
  return c.SendString("I'm a GET request!")
})
// Simple POST handler
app.Post("/api/register", func(c *fiber.Ctx) error {
  return c.SendString("I'm a POST request!")
})

Use can be used for middleware packages and prefix catchers. These routes will only match the beginning of each path i.e. /john will match /john/doe, /johnnnnn etc

func (app *App) Use(args ...interface{}) Router

// Match any request
app.Use(func(c *fiber.Ctx) error {
    return c.Next()
})
// Match request starting with /api
app.Use("/api", func(c *fiber.Ctx) error {
    return c.Next()
})
// Attach multiple handlers 
app.Use("/api",func(c *fiber.Ctx) error {
  c.Set("X-Custom-Header", random.String(32))
    return c.Next()
}, func(c *fiber.Ctx) error {
    return c.Next()
})

Mount

You can Mount Fiber instance by creating a *Mount

Signature

func (a *App) Mount(prefix string, app *App) Router

Example

func main() {
    micro := fiber.New()
    micro.Get("/doe", func(c *fiber.Ctx) error {
        return c.SendStatus(fiber.StatusOK)
    })
    app := fiber.New()
    app.Mount("/john", micro) // GET /john/doe -> 200 OK
    log.Fatal(app.Listen(":3000"))
}

Group

You can group routes by creating a *Group struct.

Signature

func (app *App) Group(prefix string, handlers ...Handler) Router

Example

func main() {
  app := fiber.New()
  api := app.Group("/api", handler)  // /api
  v1 := api.Group("/v1", handler)   // /api/v1
  v1.Get("/list", handler)          // /api/v1/list
  v1.Get("/user", handler)          // /api/v1/user
  v2 := api.Group("/v2", handler)   // /api/v2
  v2.Get("/list", handler)          // /api/v2/list
  v2.Get("/user", handler)          // /api/v2/user
  log.Fatal(app.Listen(":3000"))
}

Server

Server returns the underlying fasthttp server

func (app *App) Server() *fasthttp.Server

func main() {
    app := fiber.New()
    app.Server().MaxConnsPerIP = 1
    // ...
}

Stack

This method returns the original router stack

func (app *App) Stack() [][]*Route

var handler = func(c *fiber.Ctx) error { return nil }
func main() {
    app := fiber.New()
    app.Get("/john/:age", handler)
    app.Post("/register", handler)
    data, _ := json.MarshalIndent(app.Stack(), "", "  ")
    fmt.Println(string(data))
    app.Listen(":3000")
}

[
  [
    {
      "method": "GET",
      "path": "/john/:age",
      "params": [
        "age"
      ]
    }
  ],
  [
    {
      "method": "HEAD",
      "path": "/john/:age",
      "params": [
        "age"
      ]
    }
  ],
  [
    {
      "method": "POST",
      "path": "/register",
      "params": null
    }
  ]
]

Config

Config returns the app config as value ( read-only ).

func (app *App) Config() Config

Handler

Handler returns the server handler that can be used to serve custom *fasthttp.RequestCtx requests.

func (app *App) Handler() fasthttp.RequestHandler

Listen

Listen serves HTTP requests from the given address.

func (app *App) Listen(addr string) error

// Listen on port :8080 
app.Listen(":8080")
// Custom host
app.Listen("127.0.0.1:8080")

ListenTLS

ListenTLS serves HTTPs requests from the given address using certFile and keyFile paths to as TLS certificate and key file.

func (app *App) ListenTLS(addr, certFile, keyFile string) error

app.ListenTLS(":443", "./cert.pem", "./cert.key");

Using ListenTLS defaults to the following config ( use Listener to provide your own config )

&tls.Config{
    MinVersion:               tls.VersionTLS12,
    PreferServerCipherSuites: true,
    Certificates: []tls.Certificate{
        cert,
    },
}

Listener

You can pass your own net.Listener using the Listener method. This method can be used to enable TLS/HTTPS with a custom tls.Config.

func (app *App) Listener(ln net.Listener) error

ln, _ := net.Listen("tcp", ":3000")
cer, _:= tls.LoadX509KeyPair("server.crt", "server.key")
ln = tls.NewListener(ln, &tls.Config{Certificates: []tls.Certificate{cer}})
app.Listener(ln)

Test

Testing your application is done with the Test method. Use this method for creating _test.go files or when you need to debug your routing logic. The default timeout is 1s if you want to disable a timeout altogether, pass -1 as a second argument.

func (app *App) Test(req *http.Request, msTimeout ...int) (*http.Response, error)

// Create route with GET method for test:
app.Get("/", func(c *fiber.Ctx) error {
  fmt.Println(c.BaseURL())              // => http://google.com
  fmt.Println(c.Get("X-Custom-Header")) // => hi
  return c.SendString("hello, World!")
})
// http.Request
req := httptest.NewRequest("GET", "http://google.com", nil)
req.Header.Set("X-Custom-Header", "hi")
// http.Response
resp, _ := app.Test(req)
// Do something with results:
if resp.StatusCode == 200 {
  body, _ := ioutil.ReadAll(resp.Body)
  fmt.Println(string(body)) // => Hello, World!
}