diff --git a/socket/web/client/connector.go b/socket/web/client/connector.go
index 736069a..998232a 100644
--- a/socket/web/client/connector.go
+++ b/socket/web/client/connector.go
@@ -32,8 +32,9 @@ type Connectors struct {
 
 	URL string `json:"url"`
 
-	RequestHeader http.Header `json:"-"`
-	Subprotocols  []string    `json:"subprotocols"`
+	RequestHeader func() http.Header `json:"-"`
+
+	Subprotocols []string `json:"subprotocols"`
 	// Jar specifies the cookie jar.
 	// If Jar is nil, cookies are not sent in requests and ignored
 	// in responses.
@@ -220,7 +221,8 @@ func (c *Connectors) dial() (socket.Conn, *http.Response, error) {
 	if len(subprotocols) > 0 {
 		req.Header["Sec-WebSocket-Protocol"] = []string{strings.Join(subprotocols, ", ")}
 	}
-	for k, vs := range c.RequestHeader {
+
+	for k, vs := range c.RequestHeader() {
 		switch {
 		case k == "Host":
 			if len(vs) > 0 {