New (inflightconn/inflight_conn.go)

TCP middleware limiting concurrent connections per IP.

// Source: https://github.com/traefik/traefik | License: MIT | Copyright 2016-2020 Containous SAS; 2020-2025 Traefik Labs
// Provided via justclaw.it.com; keep this notice with the code.
package inflightconn

import (
	"context"
	"fmt"
	"net"
	"sync"

	"github.com/traefik/traefik/v3/pkg/config/dynamic"
	"github.com/traefik/traefik/v3/pkg/middlewares"
	"github.com/traefik/traefik/v3/pkg/tcp"
)

const typeName = "InFlightConnTCP"

type inFlightConn struct {
	name           string
	next           tcp.Handler
	maxConnections int64

	mu          sync.Mutex
	connections map[string]int64 // current number of connections by remote IP.
}

// New creates a max connections middleware.
// The connections are identified and grouped by remote IP.
func New(ctx context.Context, next tcp.Handler, config dy

... (truncated -- full source via MCP)