Add RedirectView to Spring Web Reactive

Main differences with the Spring MVC original implementation:
 - Default redirect HTTP code is 303 See Other since we can assume
   all HTTP clients support HTTP 1.1 in 2016
 - No more http10Compatible property, use statusCode instead
 - By default the redirect is relative to the context path
 - A builder allow to set various properties if needed
 - In UrlBasedViewResolver, a Function<String, RedirectView>
   redirectViewProvider property allows to customize RedirectView
   instances in a flexible way

Issue: SPR-14534

spring-web-reactive/src/main/java/org/springframework/web/reactive/result/view/RedirectView.java

@@ -0,0 +1,365 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.reactive.result.view;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URI;
+import java.nio.charset.Charset;
+import java.util.Collections;
+import java.util.Locale;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import reactor.core.publisher.Mono;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+import org.springframework.web.reactive.HandlerMapping;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * View that redirects to an absolute or context relative URL. The URL may be a URI
+ * template in which case the URI template variables will be replaced with values
+ * available in the model.
+ *
+ * <p>A URL for this view is supposed to be a HTTP redirect which does the redirect via
+ * sending an {@link HttpStatus#SEE_OTHER} code. If HTTP 1.0 compatibility is needed,
+ * {@link HttpStatus#FOUND} code can be set via {@link #setStatusCode(HttpStatus)}.
+ *
+ * <p>Note that the default value for the "contextRelative" flag is true.
+ * With the flag on, URLs starting with "/" are considered relative to the web application
+ * context path, while with this flag off they are considered relative to the web server
+ * root.
+ *
+ * @author Sebastien Deleuze
+ * @see #setContextRelative
+ * @since 5.0
+ */
+public class RedirectView extends AbstractUrlBasedView {
+
+	private static final Pattern URI_TEMPLATE_VARIABLE_PATTERN = Pattern.compile("\\{([^/]+?)\\}");
+
+
+	private boolean contextRelative = true;
+
+	private HttpStatus statusCode = HttpStatus.SEE_OTHER;
+
+	private boolean propagateQueryParams = false;
+
+	private String[] hosts;
+
+
+	/**
+	 * Create a new {@code RedirectView} with the given redirect URL.
+	 *
+	 * @see #builder(String)
+	 */
+	public RedirectView(String redirectUrl) {
+		super(redirectUrl);
+	}
+
+
+	/**
+	 * Return a builder for a {@code RedirectView}.
+	 */
+	public static Builder builder(String redirectUrl) {
+		return new BuilderImpl(redirectUrl);
+	}
+
+
+	/**
+	 * Set whether to interpret a given URL that starts with a slash ("/")
+	 * as relative to the current context path.
+	 * <p>Default is "true": the context path will be
+	 * prepended to the URL in such a case. If "false", an URL that starts
+	 * with a slash will be interpreted as absolute, i.e. taken as-is.
+	 */
+	public void setContextRelative(boolean contextRelative) {
+		this.contextRelative = contextRelative;
+	}
+
+	/**
+	 * Set a customized redirect status code to be used for a redirect. Default is
+	 * {@link HttpStatus#SEE_OTHER} which is the correct code for HTTP 1.1
+	 * clients. This setter can be used to configure {@link HttpStatus#FOUND}
+	 * if HTTP 1.0 clients need to be supported, or any other {@literal 3xx}
+	 * status code.
+	 */
+	public void setStatusCode(HttpStatus statusCode) {
+		Assert.notNull(statusCode);
+		this.statusCode = statusCode;
+	}
+
+	/**
+	 * Get the redirect status code.
+	 */
+	public HttpStatus getStatusCode() {
+		return statusCode;
+	}
+
+	/**
+	 * When set to {@code true} the query string of the current URL is appended
+	 * and thus propagated through to the redirected URL.
+	 * <p>Defaults to {@code false}.
+	 */
+	public void setPropagateQueryParams(boolean propagateQueryParams) {
+		this.propagateQueryParams = propagateQueryParams;
+	}
+
+	/**
+	 * Configure one or more hosts associated with the application.
+	 * All other hosts will be considered external hosts.
+	 * <p>In effect, this property provides a way turn off encoding via
+	 * {@link javax.servlet.http.HttpServletResponse#encodeRedirectURL} for URLs that have a
+	 * host and that host is not listed as a known host when using a Servlet based engine.
+	 * <p>If not set (the default) all URLs are encoded through the response.
+	 * @param hosts one or more application hosts
+	 */
+	public void setHosts(String... hosts) {
+		this.hosts = hosts;
+	}
+
+	/**
+	 * Convert model to request parameters and redirect to the given URL.
+	 * @see #sendRedirect
+	 */
+	@Override
+	protected Mono<Void> renderInternal(Map<String, Object> model, MediaType contentType,
+			ServerWebExchange exchange) {
+		String targetUrl = createTargetUrl(model, exchange);
+		return sendRedirect(exchange, targetUrl);
+	}
+
+	/**
+	 * Create the target URL by checking if the redirect string is a URI template first,
+	 * expanding it with the given model, and then optionally appending simple type model
+	 * attributes as query String parameters.
+	 */
+	protected final String createTargetUrl(Map<String, Object> model, ServerWebExchange exchange) {
+
+		ServerHttpRequest request = exchange.getRequest();
+		// Prepare target URL.
+		StringBuilder targetUrl = new StringBuilder();
+		if (this.contextRelative && getUrl().startsWith("/")) {
+			// Do not apply context path to relative URLs.
+			targetUrl.append(request.getContextPath());
+		}
+		targetUrl.append(getUrl());
+
+		Charset charset = this.getDefaultCharset();
+		if (StringUtils.hasText(targetUrl)) {
+			Map<String, String> variables = getCurrentRequestUriVariables(exchange);
+			targetUrl = replaceUriTemplateVariables(targetUrl.toString(), model, variables, charset);
+		}
+		if (this.propagateQueryParams) {
+		 	appendCurrentQueryParams(targetUrl, request);
+		}
+
+		return targetUrl.toString();
+	}
+
+	/**
+	 * Replace URI template variables in the target URL with encoded model
+	 * attributes or URI variables from the current request. Model attributes
+	 * referenced in the URL are removed from the model.
+	 * @param targetUrl the redirect URL
+	 * @param model Map that contains model attributes
+	 * @param currentUriVariables current request URI variables to use
+	 * @param charset the charset to use
+	 */
+	protected StringBuilder replaceUriTemplateVariables(String targetUrl,
+			Map<String, Object> model, Map<String, String> currentUriVariables, Charset charset) {
+
+		StringBuilder result = new StringBuilder();
+		Matcher matcher = URI_TEMPLATE_VARIABLE_PATTERN.matcher(targetUrl);
+		int endLastMatch = 0;
+		while (matcher.find()) {
+			String name = matcher.group(1);
+			Object value = (model.containsKey(name) ? model.remove(name) : currentUriVariables.get(name));
+			if (value == null) {
+				throw new IllegalArgumentException("Model has no value for key '" + name + "'");
+			}
+			result.append(targetUrl.substring(endLastMatch, matcher.start()));
+			try {
+				result.append(UriUtils.encodePathSegment(value.toString(), charset.name()));
+			}
+			catch (UnsupportedEncodingException ex) {
+				throw new IllegalStateException(ex);
+			}
+			endLastMatch = matcher.end();
+		}
+		result.append(targetUrl.substring(endLastMatch, targetUrl.length()));
+		return result;
+	}
+
+	@SuppressWarnings("unchecked")
+	private Map<String, String> getCurrentRequestUriVariables(ServerWebExchange exchange) {
+		String name = HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE;
+		return (Map<String, String>) exchange.getAttribute(name).orElse(Collections.emptyMap());
+	}
+
+	/**
+	 * Append the query string of the current request to the target redirect URL.
+	 * @param targetUrl the StringBuilder to append the properties to
+	 * @param request the current request
+	 */
+	protected void appendCurrentQueryParams(StringBuilder targetUrl, ServerHttpRequest request) {
+		String query = request.getURI().getQuery();
+		if (StringUtils.hasText(query)) {
+			// Extract anchor fragment, if any.
+			String fragment = null;
+			int anchorIndex = targetUrl.indexOf("#");
+			if (anchorIndex > -1) {
+				fragment = targetUrl.substring(anchorIndex);
+				targetUrl.delete(anchorIndex, targetUrl.length());
+			}
+
+			if (targetUrl.toString().indexOf('?') < 0) {
+				targetUrl.append('?').append(query);
+			}
+			else {
+				targetUrl.append('&').append(query);
+			}
+			// Append anchor fragment, if any, to end of URL.
+			if (fragment != null) {
+				targetUrl.append(fragment);
+			}
+		}
+	}
+
+	/**
+	 * Send a redirect back to the HTTP client
+	 * @param exchange current HTTP exchange
+	 * @param targetUrl the target URL to redirect to
+	 */
+	protected Mono<Void> sendRedirect(ServerWebExchange exchange, String targetUrl) {
+		ServerHttpResponse response = exchange.getResponse();
+		// TODO Support encoding redirect URL as ServerHttpResponse level when SPR-14529 will be fixed
+		response.getHeaders().setLocation(URI.create(targetUrl));
+		response.setStatusCode(this.statusCode);
+		return Mono.empty();
+	}
+
+	/**
+	 * Whether the given targetUrl has a host that is a "foreign" system in which
+	 * case {@link javax.servlet.http.HttpServletResponse#encodeRedirectURL} will not be applied.
+	 * This method returns {@code true} if the {@link #setHosts(String[])}
+	 * property is configured and the target URL has a host that does not match.
+	 * @param targetUrl the target redirect URL
+	 * @return {@code true} the target URL has a remote host, {@code false} if it
+	 * the URL does not have a host or the "host" property is not configured.
+	 */
+	protected boolean isRemoteHost(String targetUrl) {
+		if (ObjectUtils.isEmpty(this.hosts)) {
+			return false;
+		}
+		String targetHost = UriComponentsBuilder.fromUriString(targetUrl).build().getHost();
+		if (StringUtils.isEmpty(targetHost)) {
+			return false;
+		}
+		for (String host : this.hosts) {
+			if (targetHost.equals(host)) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	@Override
+	public boolean checkResourceExists(Locale locale) throws Exception {
+		return true;
+	}
+
+	public interface Builder {
+
+		/**
+		 * @see RedirectView#setContextRelative(boolean)
+		 */
+		Builder contextRelative(boolean contextRelative);
+
+		/**
+		 * @see RedirectView#setStatusCode(HttpStatus)
+		 */
+		Builder statusCode(HttpStatus statusCode);
+
+		/**
+		 * @see RedirectView#setPropagateQueryParams(boolean)
+		 */
+		Builder propagateQueryParams(boolean propagateQueryParams);
+
+		/**
+		 * @see RedirectView#setHosts(String...)
+		 */
+		Builder hosts(String... hosts);
+
+		/**
+		 * Build the redirect view.
+		 */
+		RedirectView build();
+
+	}
+
+	private static class BuilderImpl implements Builder {
+
+		private final RedirectView view;
+
+
+		public BuilderImpl(String redirectUrl) {
+			this.view = new RedirectView(redirectUrl);
+		}
+
+
+		@Override
+		public Builder contextRelative(boolean contextRelative) {
+			this.view.setContextRelative(contextRelative);
+			return this;
+		}
+
+		@Override
+		public Builder statusCode(HttpStatus statusCode) {
+			this.view.setStatusCode(statusCode);
+			return this;
+		}
+
+		@Override
+		public Builder propagateQueryParams(boolean propagateQueryParams) {
+			this.view.setPropagateQueryParams(propagateQueryParams);
+			return this;
+		}
+
+		@Override
+		public Builder hosts(String... hosts) {
+			this.view.setHosts(hosts);
+			return this;
+		}
+
+		@Override
+		public RedirectView build() {
+			return this.view;
+		}
+
+	}
+
+}

spring-web-reactive/src/main/java/org/springframework/web/reactive/result/view/UrlBasedViewResolver.java

@@ -17,6 +17,7 @@
 package org.springframework.web.reactive.result.view;
 
 import java.util.Locale;
+import java.util.function.Function;
 
 import reactor.core.publisher.Mono;
 
@@ -56,6 +57,15 @@ import org.springframework.util.PatternMatchUtils;
  */
 public class UrlBasedViewResolver extends ViewResolverSupport implements ViewResolver, InitializingBean {
 
+	/**
+	 * Prefix for special view names that specify a redirect URL (usually
+	 * to a controller after a form has been submitted and processed).
+	 * Such view names will not be resolved in the configured default
+	 * way but rather be treated as special shortcut.
+	 */
+	public static final String REDIRECT_URL_PREFIX = "redirect:";
+
+
 	private Class<?> viewClass;
 
 	private String prefix = "";
@@ -64,6 +74,8 @@ public class UrlBasedViewResolver extends ViewResolverSupport implements ViewRes
 
 	private String[] viewNames;
 
+	private Function<String, RedirectView> redirectViewProvider = url -> new RedirectView(url);
+
 
 	/**
 	 * Set the view class to instantiate through {@link #createUrlBasedView(String)}.
@@ -141,6 +153,13 @@ public class UrlBasedViewResolver extends ViewResolverSupport implements ViewRes
 		return this.viewNames;
 	}
 
+	/**
+	 * URL based {@link RedirectView} provider which can be used to provide, for example,
+	 * redirect views with a custom default status code.
+	 */
+	public void setRedirectViewProvider(Function<String, RedirectView> redirectViewProvider) {
+		this.redirectViewProvider = redirectViewProvider;
+	}
 
 	@Override
 	public void afterPropertiesSet() throws Exception {
@@ -149,13 +168,19 @@ public class UrlBasedViewResolver extends ViewResolverSupport implements ViewRes
 		}
 	}
 
-
 	@Override
 	public Mono<View> resolveViewName(String viewName, Locale locale) {
 		if (!canHandle(viewName, locale)) {
 			return Mono.empty();
 		}
-		AbstractUrlBasedView urlBasedView = createUrlBasedView(viewName);
+		AbstractUrlBasedView urlBasedView;
+		if (viewName.startsWith(REDIRECT_URL_PREFIX)) {
+			String redirectUrl = viewName.substring(REDIRECT_URL_PREFIX.length());
+			urlBasedView = this.redirectViewProvider.apply(redirectUrl);
+		}
+		else {
+			urlBasedView = createUrlBasedView(viewName);
+		}
 		View view = applyLifecycleMethods(viewName, urlBasedView);
 		try {
 			return (urlBasedView.checkResourceExists(locale) ? Mono.just(view) : Mono.empty());

spring-web-reactive/src/test/java/org/springframework/web/reactive/result/view/RedirectViewTests.java

@@ -0,0 +1,150 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.reactive.result.view;
+
+import java.net.URI;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
+import org.springframework.mock.http.server.reactive.test.MockServerHttpResponse;
+import org.springframework.web.reactive.HandlerMapping;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.adapter.DefaultServerWebExchange;
+import org.springframework.web.server.session.DefaultWebSessionManager;
+import org.springframework.web.server.session.WebSessionManager;
+
+/**
+ * Tests for redirect view, and query string construction.
+ * Doesn't test URL encoding, although it does check that it's called.
+ *
+ * @author Sebastien Deleuze
+ */
+public class RedirectViewTests {
+
+	private MockServerHttpRequest request;
+
+	private MockServerHttpResponse response;
+
+	private ServerWebExchange exchange;
+
+
+	@Before
+	public void setUp() {
+		request = new MockServerHttpRequest();
+		request.setContextPath("/context");
+		response = new MockServerHttpResponse();
+		WebSessionManager sessionManager = new DefaultWebSessionManager();
+		exchange = new DefaultServerWebExchange(request, response, sessionManager);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void noUrlSet() throws Exception {
+		RedirectView rv = new RedirectView(null);
+		rv.afterPropertiesSet();
+	}
+
+	@Test
+	public void defaultStatusCode() {
+		String url = "http://url.somewhere.com";
+		RedirectView view = new RedirectView(url);
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(HttpStatus.SEE_OTHER, response.getStatusCode());
+		assertEquals(URI.create(url), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void customStatusCode() {
+		RedirectView view = RedirectView
+				.builder("http://url.somewhere.com")
+				.statusCode(HttpStatus.FOUND)
+				.build();
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(HttpStatus.FOUND, response.getStatusCode());
+		assertEquals(URI.create("http://url.somewhere.com"), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void contextRelative() {
+		String url = "/test.html";
+		RedirectView view = new RedirectView(url);
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(URI.create("/context/test.html"), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void contextRelativeQueryParam() {
+		String url = "/test.html?id=1";
+		RedirectView view = new RedirectView(url);
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(URI.create("/context/test.html?id=1"), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void remoteHost() {
+		RedirectView view = new RedirectView("");
+
+		assertFalse(view.isRemoteHost("http://url.somewhere.com"));
+		assertFalse(view.isRemoteHost("/path"));
+		assertFalse(view.isRemoteHost("http://url.somewhereelse.com"));
+
+		view.setHosts(new String[] {"url.somewhere.com"});
+
+		assertFalse(view.isRemoteHost("http://url.somewhere.com"));
+		assertFalse(view.isRemoteHost("/path"));
+		assertTrue(view.isRemoteHost("http://url.somewhereelse.com"));
+	}
+
+	@Test
+	public void expandUriTemplateVariablesFromModel() {
+		String url = "http://url.somewhere.com?foo={foo}";
+		Map<String, String> model = Collections.singletonMap("foo", "bar");
+		RedirectView view = new RedirectView(url);
+		view.render(model, MediaType.TEXT_HTML, exchange);
+		assertEquals(URI.create("http://url.somewhere.com?foo=bar"), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void expandUriTemplateVariablesFromExchangeAttribute() {
+		String url = "http://url.somewhere.com?foo={foo}";
+		Map<String, String> attributes = Collections.singletonMap("foo", "bar");
+		exchange.getAttributes().put(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, attributes);
+		RedirectView view = new RedirectView(url);
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(URI.create("http://url.somewhere.com?foo=bar"), response.getHeaders().getLocation());
+	}
+
+	@Test
+	public void propagateQueryParams() throws Exception {
+		RedirectView view = RedirectView
+				.builder("http://url.somewhere.com?foo=bar#bazz")
+				.propagateQueryParams(true)
+				.build();
+		request.setUri(URI.create("http://url.somewhere.com?a=b&c=d"));
+		view.render(new HashMap<>(), MediaType.TEXT_HTML, exchange);
+		assertEquals(HttpStatus.SEE_OTHER, response.getStatusCode());
+		assertEquals(URI.create("http://url.somewhere.com?foo=bar&a=b&c=d#bazz"), response.getHeaders().getLocation());
+	}
+
+}

spring-web-reactive/src/test/java/org/springframework/web/reactive/result/view/UrlBasedViewResolverTests.java

@@ -19,33 +19,40 @@ package org.springframework.web.reactive.result.view;
 import java.util.Locale;
 import java.util.Map;
 
+import static org.junit.Assert.*;
+import org.junit.Before;
 import org.junit.Test;
 import reactor.core.publisher.Mono;
 
 import org.springframework.context.support.StaticApplicationContext;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.web.server.ServerWebExchange;
 
-import static org.junit.Assert.assertNotNull;
+import reactor.test.StepVerifier;
-import static org.junit.Assert.assertNull;
 
 /**
  * Unit tests for {@link UrlBasedViewResolver}.
  *
  * @author Rossen Stoyanchev
+ * @author Sebastien Deleuze
  */
 public class UrlBasedViewResolverTests {
 
+	private UrlBasedViewResolver resolver;
 
-	@Test
+	@Before
-	public void viewNames() throws Exception {
+	public void setUp() {
 		StaticApplicationContext context = new StaticApplicationContext();
 		context.refresh();
+		resolver = new UrlBasedViewResolver();
+		resolver.setApplicationContext(context);
+	}
 
-		UrlBasedViewResolver resolver = new UrlBasedViewResolver();
+	@Test
+	public void viewNames() throws Exception {
 		resolver.setViewClass(TestView.class);
 		resolver.setViewNames("my*");
-		resolver.setApplicationContext(context);
 
 		Mono<View> mono = resolver.resolveViewName("my-view", Locale.US);
 		assertNotNull(mono.block());
@@ -54,6 +61,34 @@ public class UrlBasedViewResolverTests {
 		assertNull(mono.block());
 	}
 
+	@Test
+	public void redirectView() throws Exception {
+		Mono<View> mono = resolver.resolveViewName("redirect:foo", Locale.US);
+		assertNotNull(mono.block());
+		StepVerifier.create(mono)
+				.consumeNextWith(view -> {
+					assertEquals(RedirectView.class, view.getClass());
+					RedirectView redirectView = (RedirectView) view;
+					assertEquals(redirectView.getUrl(), "foo");
+					assertEquals(redirectView.getStatusCode(), HttpStatus.SEE_OTHER);
+				})
+				.expectComplete();
+	}
+
+	@Test
+	public void customizedRedirectView() throws Exception {
+		resolver.setRedirectViewProvider(url -> RedirectView.builder(url).statusCode(HttpStatus.FOUND).build());
+		Mono<View> mono = resolver.resolveViewName("redirect:foo", Locale.US);
+		assertNotNull(mono.block());
+		StepVerifier.create(mono)
+				.consumeNextWith(view -> {
+					assertEquals(RedirectView.class, view.getClass());
+					RedirectView redirectView = (RedirectView) view;
+					assertEquals(redirectView.getUrl(), "foo");
+					assertEquals(redirectView.getStatusCode(), HttpStatus.FOUND);
+				})
+				.expectComplete();
+	}
 
 	private static class TestView extends AbstractUrlBasedView {