Merge pull request #2781 from chanjsq/patch-1

fix the broken RFC link

Author: iliakan

5-network/11-websocket/article.md

@@ -1,6 +1,6 @@
 # WebSocket
 
-The `WebSocket` protocol, described in the specification [RFC 6455](http://tools.ietf.org/html/rfc6455) provides a way to exchange data between browser and server via a persistent connection. The data can be passed in both directions as "packets", without breaking the connection and additional HTTP-requests.
+The `WebSocket` protocol, described in the specification [RFC 6455](https://datatracker.ietf.org/doc/html/rfc6455) provides a way to exchange data between browser and server via a persistent connection. The data can be passed in both directions as "packets", without breaking the connection and additional HTTP-requests.
 
 WebSocket is especially great for services that require continuous data exchange, e.g. online games, real-time trading systems and so on.