Polishing contribution

Closes gh-28000

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/AbstractHttpSendingTransportHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -79,15 +79,7 @@ public abstract class AbstractHttpSendingTransportHandler extends AbstractTransp
 			if (logger.isDebugEnabled()) {
 				logger.debug("Connection already closed (but not removed yet) for " + sockJsSession);
 			}
-			SockJsFrameFormat frameFormat = this.getFrameFormat(request);
-			SockJsFrame frame = SockJsFrame.closeFrameGoAway();
-			String formattedFrame = frameFormat.format(frame);
-			try {
-				response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
-			}
-			catch (IOException ex) {
-				throw new SockJsException("Failed to send " + frame, sockJsSession.getId(), ex);
-			}
+			writeFrame(SockJsFrame.closeFrameGoAway(), request, response, sockJsSession);
 		}
 		else if (!sockJsSession.isActive()) {
 			if (logger.isTraceEnabled()) {
@@ -99,13 +91,19 @@ public abstract class AbstractHttpSendingTransportHandler extends AbstractTransp
 			if (logger.isDebugEnabled()) {
 				logger.debug("Another " + getTransportType() + " connection still open for " + sockJsSession);
 			}
-			String formattedFrame = getFrameFormat(request).format(SockJsFrame.closeFrameAnotherConnectionOpen());
-			try {
-				response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
-			}
-			catch (IOException ex) {
-				throw new SockJsException("Failed to send " + formattedFrame, sockJsSession.getId(), ex);
-			}
+			writeFrame(SockJsFrame.closeFrameAnotherConnectionOpen(), request, response, sockJsSession);
+		}
+	}
+
+	private void writeFrame(SockJsFrame frame, ServerHttpRequest request, ServerHttpResponse response,
+			AbstractHttpSockJsSession sockJsSession) {
+
+		String formattedFrame = getFrameFormat(request).format(frame);
+		try {
+			response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
+		}
+		catch (IOException ex) {
+			throw new SockJsException("Failed to send " + formattedFrame, sockJsSession.getId(), ex);
 		}
 	}
 

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/session/AbstractHttpSockJsSession.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.