Function New

app.go:666–788

New creates a new Fiber named instance. app := fiber.New() You can pass optional configuration options by passing a Config struct: app := fiber.New(fiber.Config{ ServerHeader: "Fiber", })

(config ...Config)

//	    ServerHeader: "Fiber",
//	})
func New(config ...Config) *App {
	// Create a new app
	app := &App{
		// Create config
		config:        Config{},
		toBytes:       utils.UnsafeBytes,
		toString:      utils.UnsafeString,
		latestRoute:   &Route{},
		customBinders: []CustomBinder{},
		sendfiles:     []*sendFileStore{},
	}

	// Create Ctx pool
	app.pool = sync.Pool{
		New: func() any {
			if app.newCtxFunc != nil {
				return app.newCtxFunc(app)
			}
			return NewDefaultCtx(app)
		},
	}

	// Define hooks
	app.hooks = newHooks(app)

	// Define mountFields
	app.mountFields = newMountFields(app)

	// Define state
	app.state = newState()

	// Override config if provided
	if len(config) > 0 {
		app.config = config[0]
	}

	// Initialize configured before defaults are set
	app.configured = app.config
	if err := app.validateConfiguredServices(); err != nil {
		panic(err)
	}

	// Override default values
	if app.config.BodyLimit <= 0 {
		app.config.BodyLimit = DefaultBodyLimit
	}
	if app.config.MaxRanges <= 0 {
		app.config.MaxRanges = DefaultMaxRanges
	}
	if app.config.Concurrency <= 0 {
		app.config.Concurrency = DefaultConcurrency
	}
	if app.config.ReadBufferSize <= 0 {
		app.config.ReadBufferSize = DefaultReadBufferSize
	}
	if app.config.WriteBufferSize <= 0 {
		app.config.WriteBufferSize = DefaultWriteBufferSize
	}