diff --git a/go.mod b/go.mod
index cbed51c..899dbe6 100644
--- a/go.mod
+++ b/go.mod
@@ -10,10 +10,17 @@ require (
 	gorm.io/plugin/dbresolver v1.6.2
 )
 
+require (
+	github.com/fasthttp/websocket v1.5.8 // indirect
+	github.com/savsgio/gotils v0.0.0-20240303185622-093b76447511 // indirect
+	golang.org/x/net v0.43.0 // indirect
+)
+
 require (
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
 	github.com/go-sql-driver/mysql v1.9.3 // indirect
+	github.com/gofiber/contrib/websocket v1.3.4
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
diff --git a/go.sum b/go.sum
index 84683d6..484c752 100644
--- a/go.sum
+++ b/go.sum
@@ -7,8 +7,12 @@ github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUS
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fasthttp/websocket v1.5.8 h1:k5DpirKkftIF/w1R8ZzjSgARJrs54Je9YJK37DL/Ah8=
+github.com/fasthttp/websocket v1.5.8/go.mod h1:d08g8WaT6nnyvg9uMm8K9zMYyDjfKyj3170AtPRuVU0=
 github.com/go-sql-driver/mysql v1.9.3 h1:U/N249h2WzJ3Ukj8SowVFjdtZKfu9vlLZxjPXV1aweo=
 github.com/go-sql-driver/mysql v1.9.3/go.mod h1:qn46aNg1333BRMNU69Lq93t8du/dwxI64Gl8i5p1WMU=
+github.com/gofiber/contrib/websocket v1.3.4 h1:tWeBdbJ8q0WFQXariLN4dBIbGH9KBU75s0s7YXplOSg=
+github.com/gofiber/contrib/websocket v1.3.4/go.mod h1:kTFBPC6YENCnKfKx0BoOFjgXxdz7E85/STdkmZPEmPs=
 github.com/gofiber/fiber/v2 v2.52.9 h1:YjKl5DOiyP3j0mO61u3NTmK7or8GzzWzCFzkboyP5cw=
 github.com/gofiber/fiber/v2 v2.52.9/go.mod h1:YEcBbO/FB+5M1IZNBP9FO3J9281zgPAreiI1oqg8nDw=
 github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 h1:au07oEsX2xN0ktxqI+Sida1w446QrXBRJ0nee3SNZlA=
@@ -59,6 +63,8 @@ github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/savsgio/gotils v0.0.0-20240303185622-093b76447511 h1:KanIMPX0QdEdB4R3CiimCAbxFrhB3j7h0/OvpYGVQa8=
+github.com/savsgio/gotils v0.0.0-20240303185622-093b76447511/go.mod h1:sM7Mt7uEoCeFSCBM+qBrqvEo+/9vdmj19wzp3yzUhmg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -80,6 +86,8 @@ golang.org/x/crypto v0.41.0 h1:WKYxWedPGCTVVl5+WHSSrOBT0O8lx32+zxmHxijgXp4=
 golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sUc=
 golang.org/x/mod v0.27.0 h1:kb+q2PyFnEADO2IEF935ehFUXlWiNjJWtRNgBLSfbxQ=
 golang.org/x/mod v0.27.0/go.mod h1:rWI627Fq0DEoudcK+MBkNkCe0EetEaDSwJJkCcjpazc=
+golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
+golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
 golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
 golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/main.go b/main.go
index 762a83d..65e5c2e 100644
--- a/main.go
+++ b/main.go
@@ -11,6 +11,7 @@ import (
 	"git.kocoder.xyz/kocoded/vt/query"
 	"git.kocoder.xyz/kocoded/vt/routers"
 	"git.kocoder.xyz/kocoded/vt/utils"
+	"github.com/gofiber/contrib/websocket"
 	"github.com/gofiber/fiber/v2"
 	"github.com/gofiber/fiber/v2/middleware/compress"
 	"github.com/gofiber/fiber/v2/middleware/cors"
@@ -39,6 +40,39 @@ func main() {
 	routers.RegisterAnsprechpartnerRouter(app.Group("/v1/ansprechpartner"), logger)
 	routers.RegisterFirmaRouter(app.Group("/v1/firma"), logger)
 
+	app.Use("/ws", func(c *fiber.Ctx) error {
+		if websocket.IsWebSocketUpgrade(c) {
+			c.Locals("allowed", true)
+			return c.Next()
+		}
+		return fiber.ErrUpgradeRequired
+	})
+	app.Get("/ws/:id<int>", websocket.New(func(c *websocket.Conn) {
+		log.Println(c.Locals("allowed"))  // true
+		log.Println(c.Params("id"))       // 123
+		log.Println(c.Query("v"))         // 1.0
+		log.Println(c.Cookies("session")) // ""
+
+		var (
+			mt  int
+			msg []byte
+			err error
+		)
+		for {
+			if mt, msg, err = c.ReadMessage(); err != nil {
+				slog.Info("read", "error", err)
+				break
+			}
+
+			slog.Info("recv:", "messageType", mt, "bytes", msg)
+
+			if err = c.WriteMessage(mt, msg); err != nil {
+				slog.Info("write", "error", err)
+				break
+			}
+		}
+	}))
+
 	log.Fatalln(app.Listen(":3000"))
 }