Fix response headers forwarding in error responses

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/AbstractErrorWebExceptionHandler.java

@@ -306,8 +306,7 @@ private String formatRequest(ServerRequest request) {
 	}
 
 	private Mono<? extends Void> write(ServerWebExchange exchange, ServerResponse response) {
-		// force content-type since writeTo won't overwrite response header values
-		exchange.getResponse().getHeaders().setContentType(response.headers().getContentType());
+		exchange.getResponse().getHeaders().clear();
 		return response.writeTo(exchange, new ResponseContext());
 	}