Merge branch '3.4.x'

Closes gh-44631

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/transport/HttpClientTransport.java

@@ -36,7 +36,6 @@ import org.apache.hc.core5.http.Header;
 import org.apache.hc.core5.http.HttpEntity;
 import org.apache.hc.core5.http.HttpHost;
 import org.apache.hc.core5.http.io.entity.AbstractHttpEntity;
-import org.apache.hc.core5.http.message.StatusLine;
 
 import org.springframework.boot.buildpack.platform.io.Content;
 import org.springframework.boot.buildpack.platform.io.IOConsumer;
@@ -51,6 +50,7 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @author Mike Smithson
  * @author Scott Frederick
+ * @author Moritz Halbritter
  */
 abstract class HttpClientTransport implements HttpTransport {
 
@@ -159,12 +159,12 @@ abstract class HttpClientTransport implements HttpTransport {
 			ClassicHttpResponse response = this.client.executeOpen(this.host, request, null);
 			int statusCode = response.getCode();
 			if (statusCode >= 400 && statusCode <= 500) {
-				HttpEntity entity = response.getEntity();
-				Errors errors = (statusCode != 500) ? getErrorsFromResponse(entity) : null;
-				Message message = getMessageFromResponse(entity);
-				StatusLine statusLine = new StatusLine(response);
+				byte[] content = readContent(response);
+				response.close();
+				Errors errors = (statusCode != 500) ? deserializeErrors(content) : null;
+				Message message = deserializeMessage(content);
 				throw new DockerEngineException(this.host.toHostString(), request.getUri(), statusCode,
-						statusLine.getReasonPhrase(), errors, message);
+						response.getReasonPhrase(), errors, message);
 			}
 			return new HttpClientResponse(response);
 		}
@@ -173,19 +173,38 @@ abstract class HttpClientTransport implements HttpTransport {
 		}
 	}
 
-	private Errors getErrorsFromResponse(HttpEntity entity) {
+	private byte[] readContent(ClassicHttpResponse response) throws IOException {
+		HttpEntity entity = response.getEntity();
+		if (entity == null) {
+			return null;
+		}
+		try (InputStream stream = entity.getContent()) {
+			if (stream == null) {
+				return null;
+			}
+			return stream.readAllBytes();
+		}
+	}
+
+	private Errors deserializeErrors(byte[] content) {
+		if (content == null) {
+			return null;
+		}
 		try {
-			return SharedObjectMapper.get().readValue(entity.getContent(), Errors.class);
+			return SharedObjectMapper.get().readValue(content, Errors.class);
 		}
 		catch (IOException ex) {
 			return null;
 		}
 	}
 
-	private Message getMessageFromResponse(HttpEntity entity) {
+	private Message deserializeMessage(byte[] content) {
+		if (content == null) {
+			return null;
+		}
 		try {
-			return (entity.getContent() != null)
-					? SharedObjectMapper.get().readValue(entity.getContent(), Message.class) : null;
+			Message message = SharedObjectMapper.get().readValue(content, Message.class);
+			return (message.getMessage() != null) ? message : null;
 		}
 		catch (IOException ex) {
 			return null;

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/transport/HttpClientTransportTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -57,6 +57,7 @@ import static org.mockito.BDDMockito.then;
  * @author Phillip Webb
  * @author Mike Smithson
  * @author Scott Frederick
+ * @author Moritz Halbritter
  */
 @ExtendWith(MockitoExtension.class)
 class HttpClientTransportTests {
@@ -309,6 +310,18 @@ class HttpClientTransportTests {
 			});
 	}
 
+	@Test
+	void shouldReturnErrorsAndMessage() throws IOException {
+		givenClientWillReturnResponse();
+		given(this.entity.getContent()).willReturn(getClass().getResourceAsStream("message-and-errors.json"));
+		given(this.response.getCode()).willReturn(404);
+		assertThatExceptionOfType(DockerEngineException.class).isThrownBy(() -> this.http.get(this.uri))
+			.satisfies((ex) -> {
+				assertThat(ex.getErrors()).hasSize(2);
+				assertThat(ex.getResponseMessage().getMessage()).contains("test message");
+			});
+	}
+
 	@Test
 	void executeWhenClientThrowsIOExceptionRethrowsAsDockerException() throws IOException {
 		given(this.client.executeOpen(any(HttpHost.class), any(HttpUriRequest.class), isNull()))

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/resources/org/springframework/boot/buildpack/platform/docker/transport/message-and-errors.json

@@ -0,0 +1,15 @@
+{
+  "message": "test message",
+  "errors": [
+    {
+      "code": "TEST1",
+      "message": "Test One",
+      "detail": 123
+    },
+    {
+      "code": "TEST2",
+      "message": "Test Two",
+      "detail": "fail"
+    }
+  ]
+}