SpringMvcContract: Ignore RequestMapping headers with no value.

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/support/SpringMvcContract.java

@@ -275,8 +275,10 @@ public class SpringMvcContract extends Contract.BaseContract
 		if (annotation.headers() != null && annotation.headers().length > 0) {
 			for (String header : annotation.headers()) {
 				int index = header.indexOf('=');
-				md.template().header(resolve(header.substring(0, index)),
+				if (!header.contains("!=") && index >= 0) {
+					md.template().header(resolve(header.substring(0, index)),
 						resolve(header.substring(index + 1).trim()));
+				}
 			}
 		}
 	}

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/feign/support/SpringMvcContractTests.java

@@ -333,6 +333,18 @@ public class SpringMvcContractTests {
 	}
 
 	@Test
+	public void testProcessHeadersWithoutValues() throws Exception {
+		Method method = TestTemplate_HeadersWithoutValues.class.getDeclaredMethod("getTest",
+				String.class);
+		MethodMetadata data = this.contract
+				.parseAndValidateMetadata(method.getDeclaringClass(), method);
+
+		assertEquals("/test/{id}", data.template().url());
+		assertEquals("GET", data.template().method());
+		assertEquals(true, data.template().headers().isEmpty());
+	}
+
+	@Test
 	public void testProcessAnnotations_Fallback() throws Exception {
 		Method method = TestTemplate_Advanced.class.getDeclaredMethod("getTestFallback",
 				String.class, String.class, Integer.class);
@@ -462,6 +474,11 @@ public class SpringMvcContractTests {
 		ResponseEntity<TestObject> getTest(@PathVariable("id") String id);
 	}
 
+	public interface TestTemplate_HeadersWithoutValues {
+		@RequestMapping(value = "/test/{id}", method = RequestMethod.GET, headers = { "X-Foo", "!X-Bar", "X-Baz!=fooBar" })
+		ResponseEntity<TestObject> getTest(@PathVariable("id") String id);
+	}
+
 	public interface TestTemplate_ListParams {
 		@RequestMapping(value = "/test", method = RequestMethod.GET)
 		ResponseEntity<TestObject> getTest(@RequestParam("id") List<String> id);