if streamlined

src/protocol/mod.rs

@@ -453,16 +453,14 @@ impl WebSocketContext {
                         // A server MUST remove masking for data frames received from a client
                         // as described in Section 5.3. (RFC 6455)
                         frame.apply_mask()
-                    } else {
+                    } else if !self.config.accept_unmasked_frames {
                         // The server MUST close the connection upon receiving a
                         // frame that is not masked. (RFC 6455)
                         // The only exception here is if the user explicitly accepts given
                         // stream by setting WebSocketConfig.accept_unmasked_frames to true
-                        if !self.config.accept_unmasked_frames {
-                            return Err(Error::Protocol(
-                                "Received an unmasked frame from client".into(),
-                            ));
-                        }
+                        return Err(Error::Protocol(
+                            "Received an unmasked frame from client".into(),
+                        ));
                     }
                 }
                 Role::Client => {