New() — fiber Function Reference

Architecture documentation for the New() function in app.go from the fiber codebase.

Function go FiberCore Context

Entity Profile

FiberCore→ Context→ New() — fiber Function Reference

Dependency Diagram

graph TD
  70b9fa45_2b4d_d5f2_f6d1_f44ce79d6061["New()"]
  258982c0_9752_bf98_01ce_836d4de563e1["app.go"]
  70b9fa45_2b4d_d5f2_f6d1_f44ce79d6061 -->|defined in| 258982c0_9752_bf98_01ce_836d4de563e1
  style 70b9fa45_2b4d_d5f2_f6d1_f44ce79d6061 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

app.go lines 529–648

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
	}
	if app.config.CompressedFileSuffixes == nil {
		app.config.CompressedFileSuffixes = map[string]string{
			"gzip": ".fiber.gz",
			"br":   ".fiber.br",
			"zstd": ".fiber.zst",
		}
	}

	if app.config.Immutable {
		app.toBytes, app.toString = toBytesImmutable, toStringImmutable
	}

	if app.config.ErrorHandler == nil {
		app.config.ErrorHandler = DefaultErrorHandler
	}

	if app.config.JSONEncoder == nil {
		app.config.JSONEncoder = json.Marshal
	}
	if app.config.JSONDecoder == nil {
		app.config.JSONDecoder = json.Unmarshal
	}
	if app.config.MsgPackEncoder == nil {