Polishing in HttpWebHandlerAdapter

Closes gh-23780

Author: rstoyanchev

spring-web/src/main/java/org/springframework/web/server/adapter/HttpWebHandlerAdapter.java

@@ -267,12 +267,14 @@ private Mono<Void> handleUnresolvedError(ServerWebExchange exchange, Throwable e
 		ServerHttpResponse response = exchange.getResponse();
 		String logPrefix = exchange.getLogPrefix();
 
-		if (isDisconnectedClientError(ex)) {
-			// Request handling error (e.g. remote call), if we manage to set the status..
-			if (response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR)) {
-				logger.error(logPrefix + "500 Server Error for " + formatRequest(request), ex);
-				return Mono.empty();
-			}
+		// Sometimes a remote call error can look like a disconnected client.
+		// Try to set the response first before the "isDisconnectedClient" check.
+
+		if (response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR)) {
+			logger.error(logPrefix + "500 Server Error for " + formatRequest(request), ex);
+			return Mono.empty();
+		}
+		else if (isDisconnectedClientError(ex)) {
 			if (lostClientLogger.isTraceEnabled()) {
 				lostClientLogger.trace(logPrefix + "Client went away", ex);
 			}
@@ -282,10 +284,6 @@ else if (lostClientLogger.isDebugEnabled()) {
 			}
 			return Mono.empty();
 		}
-		else if (response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR)) {
-			logger.error(logPrefix + "500 Server Error for " + formatRequest(request), ex);
-			return Mono.empty();
-		}
 		else {
 			// After the response is committed, propagate errors to the server...
 			logger.error(logPrefix + "Error [" + ex + "] for " + formatRequest(request) +