do not return Sec-WebSocket-Accept in response if upgrade error (not read yet from Request) + StatusCode getter

internal/http/upgrade/response/public.go

@@ -23,6 +23,12 @@ func (r *T) SetProtocol(p []byte) {
 // to the rfc from the Sec-WebSocket-Key
 func (r *T) ProcessKey(k []byte) {
 
+	// do nothing for empty key
+	if k == nil || len(k) == 0 {
+		r.accept = nil
+		return
+	}
+
 	/* (1) Concat with constant salt */
 	mix := append(k, WSSalt...)
 
@@ -48,7 +54,11 @@ func (r T) Send(w io.Writer) (int, error) {
 		optionalProtocol = fmt.Sprintf("Sec-WebSocket-Protocol: %s\r\n", r.protocol)
 	}
 
-	headers := fmt.Sprintf("Upgrade: websocket\t\nConnection: Upgrade\r\nSec-WebSocket-Accept: %s\r\nSec-WebSocket-Version: %d\r\n%s", r.accept, WSVersion, optionalProtocol)
+	headers := fmt.Sprintf("Upgrade: websocket\t\nConnection: Upgrade\r\nSec-WebSocket-Version: %d\r\n%s", WSVersion, optionalProtocol)
+	if r.accept != nil {
+		headers = fmt.Sprintf("%sSec-WebSocket-Accept: %s\r\n", headers, r.accept)
+	}
+	headers = fmt.Sprintf("%s\r\n", headers)
 
 	/* (3) Build all */
 	raw := []byte(fmt.Sprintf("%s%s\r\n", responseLine, headers))
@@ -63,4 +73,10 @@ func (r T) Send(w io.Writer) (int, error) {
 // GetProtocol returns the choosen protocol if set, else nil
 func (r T) GetProtocol() []byte {
 	return r.protocol
+}
+
+
+// GetStatusCode returns the response status code
+func (r T) GetStatusCode() StatusCode {
+	return r.code
 }