🚀 App

The app instance conventionally denotes the Fiber application.
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.
Signature
func (app *App) Static(prefix, root string, config ...Static) Router
Use the following code to serve files in a directory named ./public
Example
app.Static("/", "./public")
​
// => http://localhost:3000/hello.html
// => http://localhost:3000/js/jquery.js
// => http://localhost:3000/css/style.css
Example
// 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:
Example
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.
fiber.Static{}
// 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
}
Example
// 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.
Signatures
// 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
Example
// 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
Signatures
func (app *App) Use(args ...interface{}) Router
Example
// 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
Signature
func (app *App) Stack() [][]*Route
Example
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")
}
Result
[
  [
    {
      "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 ).
Signature
func (app *App) Config() Config
Handler
Handler returns the server handler that can be used to serve custom *fasthttp.RequestCtx requests.
Signature
func (app *App) Handler() fasthttp.RequestHandler
Listen
Listen serves HTTP requests from the given address.
Signature
func (app *App) Listen(addr string) error
Examples
// 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.
Signature
func (app *App) ListenTLS(addr, certFile, keyFile string) error
Examples
app.ListenTLS(":443", "./cert.pem", "./cert.key");
Using ListenTLS defaults to the following config ( use Listener to provide your own config )
Default *tls.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.
Signature
func (app *App) Listener(ln net.Listener) error
Example
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.
Signature
func (app *App) Test(req *http.Request, msTimeout ...int) (*http.Response, error)
Example
// 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 == fiber.StatusOK {
  body, _ := ioutil.ReadAll(resp.Body)
  fmt.Println(string(body)) // => Hello, World!
}
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Last updated 4 weeks ago