SPR-8862 Fix issue with matching negated header values.

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/annotation/ServletAnnotationMappingUtils.java

@@ -127,12 +127,21 @@ abstract class ServletAnnotationMappingUtils {
 							}
 
 						}
+						if (negated) {
+							found = !found;
+						}
 						if (!found) {
-							return negated;
+							return false;
 						}
 					}
-					else if (!value.equals(request.getHeader(key))) {
+					else {
-						return negated;
+						boolean match = value.equals(request.getHeader(key));
+						if (negated) {
+							match = !match;
+						}
+						if (!match) {
+							return false;
+						}
 					}
 				}
 			}

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/annotation/ServletAnnotationMappingUtilsTests.java

@@ -143,6 +143,17 @@ public class ServletAnnotationMappingUtilsTests {
 		assertFalse("Invalid request method result", result);
 	}
 
+	// SPR-8862 
+	
+	@Test
+	public void checkHeadersKeyValueNoMatchWithNegation() {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
+		request.addHeader("header1", "value1");
+		String[] headers = new String[]{"header1!=value1"};
+		boolean result = ServletAnnotationMappingUtils.checkHeaders(headers, request);
+		assertFalse("Invalid request method result", result);
+	}
+
 	@Test
 	public void checkHeadersAcceptMatch() {
 		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
@@ -161,4 +172,13 @@ public class ServletAnnotationMappingUtilsTests {
 		assertFalse("Invalid request method result", result);
 	}
 
+	@Test
+	public void checkHeadersAcceptNoMatchWithNegation() {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
+		request.addHeader("Accept", "application/pdf");
+		String[] headers = new String[]{"accept!=application/pdf"};
+		boolean result = ServletAnnotationMappingUtils.checkHeaders(headers, request);
+		assertFalse("Invalid request method result", result);
+	}
+
 }

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/condition/HeadersRequestConditionTests.java

@@ -111,6 +111,15 @@ public class HeadersRequestConditionTests {
 		assertNotNull(condition.getMatchingCondition(request));
 	}
 
+	@Test
+	public void headerValueNoMatchNegated() {
+		HeadersRequestCondition condition = new HeadersRequestCondition("foo!=bar");
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addHeader("foo", "bar");
+
+		assertNull(condition.getMatchingCondition(request));
+	}
+
 	@Test
 	public void compareTo() {
 		MockHttpServletRequest request = new MockHttpServletRequest();