diff --git a/spring-web/src/main/java/org/springframework/web/cors/DefaultCorsProcessor.java b/spring-web/src/main/java/org/springframework/web/cors/DefaultCorsProcessor.java
index e90d450751..7403938469 100644
--- a/spring-web/src/main/java/org/springframework/web/cors/DefaultCorsProcessor.java
+++ b/spring-web/src/main/java/org/springframework/web/cors/DefaultCorsProcessor.java
@@ -119,6 +119,10 @@ public class DefaultCorsProcessor implements CorsProcessor {
 
 		String requestOrigin = request.getHeaders().getOrigin();
 		String allowOrigin = checkOrigin(config, requestOrigin);
+		HttpHeaders responseHeaders = response.getHeaders();
+
+		responseHeaders.add(HttpHeaders.VARY, HttpHeaders.ORIGIN);
+
 		if (allowOrigin == null) {
 			logger.debug("Rejecting CORS request because '" + requestOrigin + "' origin is not allowed");
 			rejectRequest(response);
@@ -141,9 +145,7 @@ public class DefaultCorsProcessor implements CorsProcessor {
 			return false;
 		}
 
-		HttpHeaders responseHeaders = response.getHeaders();
 		responseHeaders.setAccessControlAllowOrigin(allowOrigin);
-		responseHeaders.add(HttpHeaders.VARY, HttpHeaders.ORIGIN);
 
 		if (preFlightRequest) {
 			responseHeaders.setAccessControlAllowMethods(allowMethods);
diff --git a/spring-web/src/main/java/org/springframework/web/cors/reactive/DefaultCorsProcessor.java b/spring-web/src/main/java/org/springframework/web/cors/reactive/DefaultCorsProcessor.java
index 4d82fbfc80..39ecfae87b 100644
--- a/spring-web/src/main/java/org/springframework/web/cors/reactive/DefaultCorsProcessor.java
+++ b/spring-web/src/main/java/org/springframework/web/cors/reactive/DefaultCorsProcessor.java
@@ -105,6 +105,9 @@ public class DefaultCorsProcessor implements CorsProcessor {
 
 		ServerHttpRequest request = exchange.getRequest();
 		ServerHttpResponse response = exchange.getResponse();
+		HttpHeaders responseHeaders = response.getHeaders();
+
+		response.getHeaders().add(HttpHeaders.VARY, HttpHeaders.ORIGIN);
 
 		String requestOrigin = request.getHeaders().getOrigin();
 		String allowOrigin = checkOrigin(config, requestOrigin);
@@ -130,9 +133,7 @@ public class DefaultCorsProcessor implements CorsProcessor {
 			return false;
 		}
 
-		HttpHeaders responseHeaders = response.getHeaders();
 		responseHeaders.setAccessControlAllowOrigin(allowOrigin);
-		responseHeaders.add(HttpHeaders.VARY, HttpHeaders.ORIGIN);
 
 		if (preFlightRequest) {
 			responseHeaders.setAccessControlAllowMethods(allowMethods);
diff --git a/spring-web/src/test/java/org/springframework/web/cors/DefaultCorsProcessorTests.java b/spring-web/src/test/java/org/springframework/web/cors/DefaultCorsProcessorTests.java
index ba666056cc..c929c10e4c 100644
--- a/spring-web/src/test/java/org/springframework/web/cors/DefaultCorsProcessorTests.java
+++ b/spring-web/src/test/java/org/springframework/web/cors/DefaultCorsProcessorTests.java
@@ -65,6 +65,7 @@ public class DefaultCorsProcessorTests {
 
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_FORBIDDEN, this.response.getStatus());
 	}
 
@@ -89,6 +90,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("*", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_MAX_AGE));
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -106,6 +108,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -121,6 +124,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -132,6 +136,7 @@ public class DefaultCorsProcessorTests {
 
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -149,6 +154,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS));
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS).contains("header1"));
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS).contains("header2"));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -160,6 +166,7 @@ public class DefaultCorsProcessorTests {
 		this.conf.addAllowedOrigin("*");
 
 		this.processor.processRequest(this.conf, this.request, this.response);
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -171,6 +178,7 @@ public class DefaultCorsProcessorTests {
 		this.conf.addAllowedOrigin("*");
 
 		this.processor.processRequest(this.conf, this.request, this.response);
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_FORBIDDEN, this.response.getStatus());
 	}
 
@@ -184,6 +192,7 @@ public class DefaultCorsProcessorTests {
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 		assertEquals("GET,HEAD", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 	}
 
 	@Test
@@ -193,6 +202,7 @@ public class DefaultCorsProcessorTests {
 
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_FORBIDDEN, this.response.getStatus());
 	}
 
@@ -204,6 +214,7 @@ public class DefaultCorsProcessorTests {
 
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_FORBIDDEN, this.response.getStatus());
 	}
 
@@ -216,6 +227,7 @@ public class DefaultCorsProcessorTests {
 
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_FORBIDDEN, this.response.getStatus());
 	}
 
@@ -237,6 +249,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
 		assertEquals("GET,PUT", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_MAX_AGE));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -257,6 +270,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -275,6 +289,7 @@ public class DefaultCorsProcessorTests {
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertEquals("http://domain2.com", this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -295,6 +310,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("Header1"));
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("Header2"));
 		assertFalse(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("Header3"));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -313,6 +329,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("Header1"));
 		assertTrue(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("Header2"));
 		assertFalse(this.response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS).contains("*"));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
@@ -328,6 +345,7 @@ public class DefaultCorsProcessorTests {
 		this.processor.processRequest(this.conf, this.request, this.response);
 		assertTrue(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertFalse(this.response.containsHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS));
+		assertEquals(HttpHeaders.ORIGIN, this.response.getHeader(HttpHeaders.VARY));
 		assertEquals(HttpServletResponse.SC_OK, this.response.getStatus());
 	}
 
diff --git a/spring-web/src/test/java/org/springframework/web/cors/reactive/DefaultCorsProcessorTests.java b/spring-web/src/test/java/org/springframework/web/cors/reactive/DefaultCorsProcessorTests.java
index 115fae252a..bf396e6a7b 100644
--- a/spring-web/src/test/java/org/springframework/web/cors/reactive/DefaultCorsProcessorTests.java
+++ b/spring-web/src/test/java/org/springframework/web/cors/reactive/DefaultCorsProcessorTests.java
@@ -63,6 +63,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertFalse(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
 	}
 
@@ -87,6 +88,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("*", response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertFalse(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_MAX_AGE));
 		assertFalse(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -104,6 +106,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -119,6 +122,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -130,6 +134,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertTrue(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -147,6 +152,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS));
 		assertTrue(response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS).contains("header1"));
 		assertTrue(response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS).contains("header2"));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -157,7 +163,9 @@ public class DefaultCorsProcessorTests {
 		this.conf.addAllowedOrigin("*");
 		this.processor.process(this.conf, exchange);
 
-		assertNull(exchange.getResponse().getStatusCode());
+		ServerHttpResponse response = exchange.getResponse();
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
+		assertNull(response.getStatusCode());
 	}
 
 
@@ -168,7 +176,9 @@ public class DefaultCorsProcessorTests {
 		this.conf.addAllowedOrigin("*");
 		this.processor.process(this.conf, exchange);
 
-		assertEquals(HttpStatus.FORBIDDEN, exchange.getResponse().getStatusCode());
+		ServerHttpResponse response = exchange.getResponse();
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
+		assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
 	}
 
 	@Test
@@ -180,6 +190,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertNull(response.getStatusCode());
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertEquals("GET,HEAD", response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
 	}
 
@@ -190,6 +201,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertFalse(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
 	}
 
@@ -201,6 +213,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertFalse(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
 	}
 
@@ -214,6 +227,7 @@ public class DefaultCorsProcessorTests {
 
 		ServerHttpResponse response = exchange.getResponse();
 		assertFalse(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
 	}
 
@@ -237,6 +251,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
 		assertEquals("GET,PUT", response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS));
 		assertFalse(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_MAX_AGE));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -259,6 +274,7 @@ public class DefaultCorsProcessorTests {
 		assertEquals("http://domain2.com", response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertTrue(response.getHeaders().containsKey(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
 		assertEquals("true", response.getHeaders().getFirst(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -279,6 +295,7 @@ public class DefaultCorsProcessorTests {
 		ServerHttpResponse response = exchange.getResponse();
 		assertTrue(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertEquals("http://domain2.com", response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_ORIGIN));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -301,6 +318,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("Header1"));
 		assertTrue(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("Header2"));
 		assertFalse(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("Header3"));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -321,6 +339,7 @@ public class DefaultCorsProcessorTests {
 		assertTrue(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("Header1"));
 		assertTrue(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("Header2"));
 		assertFalse(response.getHeaders().getFirst(ACCESS_CONTROL_ALLOW_HEADERS).contains("*"));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}
 
@@ -338,6 +357,7 @@ public class DefaultCorsProcessorTests {
 		ServerHttpResponse response = exchange.getResponse();
 		assertTrue(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_ORIGIN));
 		assertFalse(response.getHeaders().containsKey(ACCESS_CONTROL_ALLOW_HEADERS));
+		assertEquals(HttpHeaders.ORIGIN, response.getHeaders().getFirst(HttpHeaders.VARY));
 		assertNull(response.getStatusCode());
 	}