diff --git a/option/simple.go b/option/simple.go
index 0e5fa478..55bfe930 100644
--- a/option/simple.go
+++ b/option/simple.go
@@ -31,5 +31,5 @@ type HTTPOutboundOptions struct {
 	Password string              `json:"password,omitempty"`
 	TLS      *OutboundTLSOptions `json:"tls,omitempty"`
 	Path     string              `json:"path,omitempty"`
-	Headers  OutboundHeader      `json:"headers,omitempty"`
+	Headers  HTTPHeader          `json:"headers,omitempty"`
 }
diff --git a/option/types.go b/option/types.go
index c97ed0c8..ddabeb6a 100644
--- a/option/types.go
+++ b/option/types.go
@@ -236,12 +236,14 @@ func DNSQueryTypeToString(queryType uint16) string {
 	return F.ToString(queryType)
 }
 
-type OutboundHeader map[string]Listable[string]
+type HTTPHeader map[string]Listable[string]
 
-func (h OutboundHeader) HTTPHeader() http.Header {
+func (h HTTPHeader) Build() http.Header {
 	header := make(http.Header)
 	for name, values := range h {
-		header[http.CanonicalHeaderKey(name)] = values
+		for _, value := range values {
+			header.Add(name, value)
+		}
 	}
 	return header
 }
diff --git a/option/v2ray_transport.go b/option/v2ray_transport.go
index 6c93dcce..54b0de79 100644
--- a/option/v2ray_transport.go
+++ b/option/v2ray_transport.go
@@ -64,16 +64,16 @@ type V2RayHTTPOptions struct {
 	Host        Listable[string] `json:"host,omitempty"`
 	Path        string           `json:"path,omitempty"`
 	Method      string           `json:"method,omitempty"`
-	Headers     OutboundHeader   `json:"headers,omitempty"`
+	Headers     HTTPHeader       `json:"headers,omitempty"`
 	IdleTimeout Duration         `json:"idle_timeout,omitempty"`
 	PingTimeout Duration         `json:"ping_timeout,omitempty"`
 }
 
 type V2RayWebsocketOptions struct {
-	Path                string         `json:"path,omitempty"`
-	Headers             OutboundHeader `json:"headers,omitempty"`
-	MaxEarlyData        uint32         `json:"max_early_data,omitempty"`
-	EarlyDataHeaderName string         `json:"early_data_header_name,omitempty"`
+	Path                string     `json:"path,omitempty"`
+	Headers             HTTPHeader `json:"headers,omitempty"`
+	MaxEarlyData        uint32     `json:"max_early_data,omitempty"`
+	EarlyDataHeaderName string     `json:"early_data_header_name,omitempty"`
 }
 
 type V2RayQUICOptions struct{}
diff --git a/outbound/http.go b/outbound/http.go
index e53d7b65..cfc03216 100644
--- a/outbound/http.go
+++ b/outbound/http.go
@@ -48,7 +48,7 @@ func NewHTTP(ctx context.Context, router adapter.Router, logger log.ContextLogge
 			Username: options.Username,
 			Password: options.Password,
 			Path:     options.Path,
-			Headers:  options.Headers.HTTPHeader(),
+			Headers:  options.Headers.Build(),
 		}),
 	}, nil
 }
diff --git a/transport/v2rayhttp/client.go b/transport/v2rayhttp/client.go
index e4859863..d5e8a1f6 100644
--- a/transport/v2rayhttp/client.go
+++ b/transport/v2rayhttp/client.go
@@ -64,7 +64,7 @@ func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, opt
 		serverAddr: serverAddr,
 		host:       options.Host,
 		method:     options.Method,
-		headers:    options.Headers.HTTPHeader(),
+		headers:    options.Headers.Build(),
 		transport:  transport,
 		http2:      tlsConfig != nil,
 	}
diff --git a/transport/v2rayhttp/server.go b/transport/v2rayhttp/server.go
index 1d5c8650..dcfb07a6 100644
--- a/transport/v2rayhttp/server.go
+++ b/transport/v2rayhttp/server.go
@@ -55,7 +55,7 @@ func NewServer(ctx context.Context, options option.V2RayHTTPOptions, tlsConfig t
 		host:    options.Host,
 		path:    options.Path,
 		method:  options.Method,
-		headers: options.Headers.HTTPHeader(),
+		headers: options.Headers.Build(),
 	}
 	if server.method == "" {
 		server.method = "PUT"