Set path in CookieWebSessionIdResolver

Issue: SPR-16030

spring-web/src/main/java/org/springframework/web/server/session/CookieWebSessionIdResolver.java

@@ -98,8 +98,10 @@ public class CookieWebSessionIdResolver implements WebSessionIdResolver {
 	private void setSessionCookie(ServerWebExchange exchange, String id, Duration maxAge) {
 		String name = getCookieName();
 		boolean secure = "https".equalsIgnoreCase(exchange.getRequest().getURI().getScheme());
-		MultiValueMap<String, ResponseCookie> cookieMap = exchange.getResponse().getCookies();
-		cookieMap.set(name, ResponseCookie.from(name, id).maxAge(maxAge).httpOnly(true).secure(secure).build());
+		String path = exchange.getRequest().getPath().contextPath().value() + "/";
+		exchange.getResponse().getCookies().set(name,
+				ResponseCookie.from(name, id).path(path)
+						.maxAge(maxAge).httpOnly(true).secure(secure).build());
 	}
 
 }

spring-web/src/test/java/org/springframework/web/server/session/CookieWebSessionIdResolverTests.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2002-2017 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.server.session;
+
+import org.junit.Test;
+
+import org.springframework.http.ResponseCookie;
+import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
+import org.springframework.mock.web.test.server.MockServerWebExchange;
+import org.springframework.util.MultiValueMap;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Unit tests for {@link CookieWebSessionIdResolver}.
+ * @author Rossen Stoyanchev
+ */
+public class CookieWebSessionIdResolverTests {
+
+	private final CookieWebSessionIdResolver resolver = new CookieWebSessionIdResolver();
+
+
+	@Test
+	public void setSessionId() throws Exception {
+		MockServerHttpRequest request = MockServerHttpRequest.get("https://example.org/path").build();
+		MockServerWebExchange exchange = MockServerWebExchange.from(request);
+		this.resolver.setSessionId(exchange, "123");
+
+		MultiValueMap<String, ResponseCookie> cookies = exchange.getResponse().getCookies();
+		assertEquals(1, cookies.size());
+		ResponseCookie cookie = cookies.getFirst(this.resolver.getCookieName());
+		assertNotNull(cookie);
+		assertEquals("SESSION=123; Path=/; Secure; HttpOnly", cookie.toString());
+	}
+}