diff --git a/internal/configtypes/types.go b/internal/configtypes/types.go
index 21cb73101..bb64ac3d7 100644
--- a/internal/configtypes/types.go
+++ b/internal/configtypes/types.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"net"
-	"net/http"
 
 	"github.com/centrifugal/centrifuge"
 )
@@ -117,38 +116,6 @@ type TransformedConnectErrorHttpResponse struct {
 	Body       string `mapstructure:"body" json:"body" envconfig:"body" yaml:"body" toml:"body"`
 }
 
-func ConnectErrorToToHTTPResponse(err error, transforms []ConnectCodeToHTTPStatusTransform) (TransformedConnectErrorHttpResponse, bool) {
-	var code uint32
-	var body string
-	switch t := err.(type) {
-	case *centrifuge.Disconnect:
-		code = t.Code
-		body = t.Reason
-	case centrifuge.Disconnect:
-		code = t.Code
-		body = t.Reason
-	case *centrifuge.Error:
-		code = t.Code
-		body = t.Message
-	default:
-	}
-	if code > 0 {
-		for _, t := range transforms {
-			if t.Code != code {
-				continue
-			}
-			if t.ToResponse.Body == "" {
-				t.ToResponse.Body = body
-			}
-			return t.ToResponse, true
-		}
-	}
-	return TransformedConnectErrorHttpResponse{
-		StatusCode: http.StatusInternalServerError,
-		Body:       http.StatusText(http.StatusInternalServerError),
-	}, false
-}
-
 type UniGRPC struct {
 	Enabled               bool      `mapstructure:"enabled" json:"enabled" envconfig:"enabled" yaml:"enabled" toml:"enabled"`
 	Address               string    `mapstructure:"address" json:"address" envconfig:"address" yaml:"address" toml:"address"`
diff --git a/internal/tools/ascii_test.go b/internal/tools/ascii_test.go
new file mode 100644
index 000000000..539c73d37
--- /dev/null
+++ b/internal/tools/ascii_test.go
@@ -0,0 +1,35 @@
+package tools
+
+import "testing"
+
+func Test_IsASCII(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected bool
+	}{
+		{
+			name:     "empty string",
+			input:    "",
+			expected: true,
+		},
+		{
+			name:     "ascii string",
+			input:    "hello",
+			expected: true,
+		},
+		{
+			name:     "non-ascii string",
+			input:    "こんにちは",
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if IsASCII(tt.input) != tt.expected {
+				t.Errorf("expected %v, got %v", tt.expected, !tt.expected)
+			}
+		})
+	}
+}
diff --git a/internal/tools/code_translate.go b/internal/tools/code_translate.go
index 138db4cd6..de413a18f 100644
--- a/internal/tools/code_translate.go
+++ b/internal/tools/code_translate.go
@@ -3,25 +3,12 @@ package tools
 import (
 	"net/http"
 
+	"github.com/centrifugal/centrifugo/v5/internal/configtypes"
+
 	"github.com/centrifugal/centrifuge"
 )
 
-type ConnectCodeToHTTPStatus struct {
-	Enabled    bool                               `mapstructure:"enabled" json:"enabled"`
-	Transforms []ConnectCodeToHTTPStatusTransform `mapstructure:"transforms" json:"transforms"`
-}
-
-type ConnectCodeToHTTPStatusTransform struct {
-	Code       uint32                              `mapstructure:"code" json:"code"`
-	ToResponse TransformedConnectErrorHttpResponse `mapstructure:"to_response" json:"to_response"`
-}
-
-type TransformedConnectErrorHttpResponse struct {
-	Status int    `mapstructure:"status_code" json:"status_code"`
-	Body   string `mapstructure:"body" json:"body"`
-}
-
-func ConnectErrorToToHTTPResponse(err error, transforms []ConnectCodeToHTTPStatusTransform) (TransformedConnectErrorHttpResponse, bool) {
+func ConnectErrorToToHTTPResponse(err error, transforms []configtypes.ConnectCodeToHTTPStatusTransform) (configtypes.TransformedConnectErrorHttpResponse, bool) {
 	var code uint32
 	var body string
 	switch t := err.(type) {
@@ -47,8 +34,8 @@ func ConnectErrorToToHTTPResponse(err error, transforms []ConnectCodeToHTTPStatu
 			return t.ToResponse, true
 		}
 	}
-	return TransformedConnectErrorHttpResponse{
-		Status: http.StatusInternalServerError,
-		Body:   http.StatusText(http.StatusInternalServerError),
+	return configtypes.TransformedConnectErrorHttpResponse{
+		StatusCode: http.StatusInternalServerError,
+		Body:       http.StatusText(http.StatusInternalServerError),
 	}, false
 }
diff --git a/internal/unihttpstream/handler.go b/internal/unihttpstream/handler.go
index c90de262d..7defa9db7 100644
--- a/internal/unihttpstream/handler.go
+++ b/internal/unihttpstream/handler.go
@@ -6,8 +6,9 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/centrifugal/centrifugo/v5/internal/tools"
+
 	"github.com/centrifugal/centrifuge"
-	"github.com/centrifugal/centrifugo/v5/internal/configtypes"
 	"github.com/centrifugal/protocol"
 )
 
@@ -95,7 +96,7 @@ func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if h.config.ConnectCodeToHTTPStatus.Enabled {
 		err = c.ConnectNoErrorToDisconnect(connectRequest)
 		if err != nil {
-			resp, ok := configtypes.ConnectErrorToToHTTPResponse(err, h.config.ConnectCodeToHTTPStatus.Transforms)
+			resp, ok := tools.ConnectErrorToToHTTPResponse(err, h.config.ConnectCodeToHTTPStatus.Transforms)
 			if ok {
 				w.WriteHeader(resp.StatusCode)
 				_, _ = w.Write([]byte(resp.Body))
diff --git a/internal/unisse/handler.go b/internal/unisse/handler.go
index 990427385..5a072f5d9 100644
--- a/internal/unisse/handler.go
+++ b/internal/unisse/handler.go
@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/centrifugal/centrifugo/v5/internal/configtypes"
+	"github.com/centrifugal/centrifugo/v5/internal/tools"
 
 	"github.com/centrifugal/centrifuge"
 	"github.com/centrifugal/protocol"
@@ -106,7 +106,7 @@ func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if h.config.ConnectCodeToHTTPStatus.Enabled {
 		err = c.ConnectNoErrorToDisconnect(connectRequest)
 		if err != nil {
-			resp, ok := configtypes.ConnectErrorToToHTTPResponse(err, h.config.ConnectCodeToHTTPStatus.Transforms)
+			resp, ok := tools.ConnectErrorToToHTTPResponse(err, h.config.ConnectCodeToHTTPStatus.Transforms)
 			if ok {
 				w.WriteHeader(resp.StatusCode)
 				_, _ = w.Write([]byte(resp.Body))