Merge branch '2.5.x'

Closes gh-27511

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/livereload/Connection.java

@@ -91,13 +91,12 @@ class Connection {
 	}
 
 	private void runWebSocket() throws Exception {
+		this.webSocket = true;
 		String accept = getWebsocketAcceptResponse();
 		this.outputStream.writeHeaders("HTTP/1.1 101 Switching Protocols", "Upgrade: websocket", "Connection: Upgrade",
 				"Sec-WebSocket-Accept: " + accept);
 		new Frame("{\"command\":\"hello\",\"protocols\":[\"http://livereload.com/protocols/official-7\"],"
 				+ "\"serverName\":\"spring-boot\"}").write(this.outputStream);
-		Thread.sleep(100);
-		this.webSocket = true;
 		while (this.running) {
 			readWebSocketFrame();
 		}