AbstractController supports HTTP OPTIONS

Issue: SPR-13130

spring-test/src/main/java/org/springframework/test/web/servlet/setup/AbstractMockMvcBuilder.java

 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -55,7 +55,7 @@ public abstract class AbstractMockMvcBuilder<B extends AbstractMockMvcBuilder<B>
 
 	private final List<ResultHandler> globalResultHandlers = new ArrayList<ResultHandler>();
 
-	private Boolean dispatchOptions = Boolean.FALSE;
+	private Boolean dispatchOptions = Boolean.TRUE;
 
 	private final List<MockMvcConfigurer> configurers = new ArrayList<MockMvcConfigurer>(4);
 

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/AbstractController.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -16,10 +16,15 @@
 
 package org.springframework.web.servlet.mvc;
 
+import java.util.Arrays;
+import java.util.List;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 
+import org.springframework.http.HttpMethod;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.support.WebContentGenerator;
 import org.springframework.web.util.WebUtils;
@@ -87,6 +92,7 @@ import org.springframework.web.util.WebUtils;
  *
  * @author Rod Johnson
  * @author Juergen Hoeller
+ * @author Rossen Stoyanchev
  * @see WebContentInterceptor
  */
 public abstract class AbstractController extends WebContentGenerator implements Controller {
@@ -149,6 +155,13 @@ public abstract class AbstractController extends WebContentGenerator implements
 	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
 			throws Exception {
 
+		String[] supportedMethods = getSupportedMethods();
+		if (HttpMethod.OPTIONS.matches(request.getMethod()) && !ObjectUtils.isEmpty(supportedMethods)) {
+			List<String> value = Arrays.asList(supportedMethods);
+			response.setHeader("Allow", StringUtils.collectionToCommaDelimitedString(value));
+			return null;
+		}
+
 		// Delegate to WebContentGenerator for checking and preparing.
 		checkRequest(request);
 		prepareResponse(response);

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/ParameterizableViewController.java

@@ -19,6 +19,7 @@ package org.springframework.web.servlet.mvc;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.View;
@@ -43,6 +44,11 @@ public class ParameterizableViewController extends AbstractController {
 	private boolean statusOnly;
 
 
+	public ParameterizableViewController() {
+		super(false);
+		setSupportedMethods(HttpMethod.GET.name(), HttpMethod.HEAD.name());
+	}
+
 	/**
 	 * Set a view name for the ModelAndView to return, to be resolved by the
 	 * DispatcherServlet via a ViewResolver. Will override any pre-existing

spring-webmvc/src/main/java/org/springframework/web/servlet/support/WebContentGenerator.java

@@ -17,10 +17,9 @@
 package org.springframework.web.servlet.support;
 
 import java.util.Arrays;
-import java.util.HashSet;
+import java.util.LinkedHashSet;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
-
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -111,7 +110,7 @@ public abstract class WebContentGenerator extends WebApplicationObjectSupport {
 	 */
 	public WebContentGenerator(boolean restrictDefaultSupportedMethods) {
 		if (restrictDefaultSupportedMethods) {
-			this.supportedMethods = new HashSet<String>(4);
+			this.supportedMethods = new LinkedHashSet<String>(4);
 			this.supportedMethods.add(METHOD_GET);
 			this.supportedMethods.add(METHOD_HEAD);
 			this.supportedMethods.add(METHOD_POST);
@@ -123,7 +122,7 @@ public abstract class WebContentGenerator extends WebApplicationObjectSupport {
 	 * @param supportedMethods the supported HTTP methods for this content generator
 	 */
 	public WebContentGenerator(String... supportedMethods) {
-		this.supportedMethods = new HashSet<String>(Arrays.asList(supportedMethods));
+		this.supportedMethods = new LinkedHashSet<String>(Arrays.asList(supportedMethods));
 	}
 
 
@@ -134,7 +133,7 @@ public abstract class WebContentGenerator extends WebApplicationObjectSupport {
 	 */
 	public final void setSupportedMethods(String... methods) {
 		if (methods != null) {
-			this.supportedMethods = new HashSet<String>(Arrays.asList(methods));
+			this.supportedMethods = new LinkedHashSet<String>(Arrays.asList(methods));
 		}
 		else {
 			this.supportedMethods = null;

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/ParameterizableViewControllerTests.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -19,6 +19,7 @@ package org.springframework.web.servlet.mvc;
 import org.junit.Before;
 import org.junit.Test;
 
+import org.springframework.http.HttpMethod;
 import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.mock.web.test.MockHttpServletResponse;
 import org.springframework.ui.ModelMap;
@@ -69,4 +70,14 @@ public class ParameterizableViewControllerTests {
 		assertEquals("value", mav.getModel().get("name"));
 	}
 
+	@Test
+	public void handleRequestHttpOptions() throws Exception {
+		this.request.setMethod(HttpMethod.OPTIONS.name());
+		MockHttpServletResponse response = new MockHttpServletResponse();
+		ModelAndView mav = this.controller.handleRequest(this.request, response);
+
+		assertNull(mav);
+		assertEquals("GET,HEAD", response.getHeader("Allow"));
+	}
+
 }