Merge pull request #10350 from vpavic:gh-10348

* pr/10350:
  Polish "Remove usage of `HttpStatus` in Web Endpoints"
  Remove usage of `HttpStatus` in Web Endpoints

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/audit/AuditEventsWebEndpointExtension.java

@@ -22,7 +22,6 @@ import org.springframework.boot.actuate.audit.AuditEventsEndpoint.AuditEventsDes
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
 import org.springframework.boot.actuate.endpoint.web.WebEndpointResponse;
 import org.springframework.boot.actuate.endpoint.web.annotation.WebEndpointExtension;
-import org.springframework.http.HttpStatus;
 
 /**
  * {@link WebEndpointExtension} for the {@link AuditEventsEndpoint}.
@@ -43,7 +42,7 @@ public class AuditEventsWebEndpointExtension {
 	public WebEndpointResponse<AuditEventsDescriptor> eventsWithPrincipalDateAfterAndType(
 			String principal, Date after, String type) {
 		if (after == null) {
-			return new WebEndpointResponse<>(HttpStatus.BAD_REQUEST.value());
+			return new WebEndpointResponse<>(WebEndpointResponse.STATUS_BAD_REQUEST);
 		}
 		AuditEventsDescriptor auditEvents = this.delegate
 				.eventsWithPrincipalDateAfterAndType(principal, after, type);

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/WebEndpointResponse.java

@@ -26,10 +26,41 @@ import org.springframework.boot.actuate.endpoint.web.annotation.WebEndpointExten
  * @param <T> the type of the response body
  * @author Stephane Nicoll
  * @author Andy Wilkinson
+ * @author Vedran Pavic
  * @since 2.0.0
  */
 public final class WebEndpointResponse<T> {
 
+	/**
+	 * {@code 200 OK}.
+	 */
+	public static final int STATUS_OK = 200;
+
+	/**
+	 * {@code 400 Bad Request}.
+	 */
+	public static final int STATUS_BAD_REQUEST = 400;
+
+	/**
+	 * {@code 404 Not Found}.
+	 */
+	public static final int STATUS_NOT_FOUND = 404;
+
+	/**
+	 * {@code 429 Too Many Requests}.
+	 */
+	public static final int STATUS_TOO_MANY_REQUESTS = 429;
+
+	/**
+	 * {@code 500 Internal Server Error}.
+	 */
+	public static final int STATUS_INTERNAL_SERVER_ERROR = 500;
+
+	/**
+	 * {@code 503 Service Unavailable}.
+	 */
+	public static final int STATUS_SERVICE_UNAVAILABLE = 503;
+
 	private final T body;
 
 	private final int status;
@@ -56,7 +87,7 @@ public final class WebEndpointResponse<T> {
 	 * @param body the body
 	 */
 	public WebEndpointResponse(T body) {
-		this(body, 200);
+		this(body, STATUS_OK);
 	}
 
 	/**

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/HealthStatusHttpMapper.java

@@ -20,6 +20,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.springframework.boot.actuate.endpoint.web.WebEndpointResponse;
 import org.springframework.util.Assert;
 
 /**
@@ -40,8 +41,9 @@ public class HealthStatusHttpMapper {
 	}
 
 	private void setupDefaultStatusMapping() {
-		addStatusMapping(Status.DOWN, 503);
+		addStatusMapping(Status.DOWN, WebEndpointResponse.STATUS_SERVICE_UNAVAILABLE);
-		addStatusMapping(Status.OUT_OF_SERVICE, 503);
+		addStatusMapping(Status.OUT_OF_SERVICE,
+				WebEndpointResponse.STATUS_SERVICE_UNAVAILABLE);
 	}
 
 	/**
@@ -102,9 +104,10 @@ public class HealthStatusHttpMapper {
 		if (code != null) {
 			return this.statusMapping.keySet().stream()
 					.filter((key) -> code.equals(getUniformValue(key)))
-					.map(this.statusMapping::get).findFirst().orElse(200);
+					.map(this.statusMapping::get).findFirst()
+					.orElse(WebEndpointResponse.STATUS_OK);
 		}
-		return 200;
+		return WebEndpointResponse.STATUS_OK;
 	}
 
 	private String getUniformValue(String code) {

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/management/HeapDumpWebEndpoint.java

@@ -42,7 +42,6 @@ import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
 import org.springframework.boot.actuate.endpoint.web.WebEndpointResponse;
 import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;
-import org.springframework.http.HttpStatus;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ReflectionUtils;
 
@@ -89,12 +88,14 @@ public class HeapDumpWebEndpoint {
 			Thread.currentThread().interrupt();
 		}
 		catch (IOException ex) {
-			return new WebEndpointResponse<>(HttpStatus.INTERNAL_SERVER_ERROR.value());
+			return new WebEndpointResponse<>(
+					WebEndpointResponse.STATUS_INTERNAL_SERVER_ERROR);
 		}
 		catch (HeapDumperUnavailableException ex) {
-			return new WebEndpointResponse<>(HttpStatus.SERVICE_UNAVAILABLE.value());
+			return new WebEndpointResponse<>(
+					WebEndpointResponse.STATUS_SERVICE_UNAVAILABLE);
 		}
-		return new WebEndpointResponse<>(HttpStatus.TOO_MANY_REQUESTS.value());
+		return new WebEndpointResponse<>(WebEndpointResponse.STATUS_TOO_MANY_REQUESTS);
 	}
 
 	private Resource dumpHeap(boolean live) throws IOException, InterruptedException {