diff --git a/AFNetworking/AFHTTPSessionManager.h b/AFNetworking/AFHTTPSessionManager.h
index 3e0b9af49b..8072061f69 100644
--- a/AFNetworking/AFHTTPSessionManager.h
+++ b/AFNetworking/AFHTTPSessionManager.h
@@ -149,7 +149,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSURLSessionDataTask *)GET:(NSString *)URLString
                    parameters:(nullable id)parameters
-                      success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                       failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 /**
@@ -179,7 +179,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSURLSessionDataTask *)POST:(NSString *)URLString
                     parameters:(nullable id)parameters
-                       success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                        failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 /**
@@ -196,7 +196,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (nullable NSURLSessionDataTask *)POST:(NSString *)URLString
                     parameters:(nullable id)parameters
      constructingBodyWithBlock:(nullable void (^)(id <AFMultipartFormData> formData))block
-                       success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                        failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 /**
@@ -211,7 +211,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSURLSessionDataTask *)PUT:(NSString *)URLString
                    parameters:(nullable id)parameters
-                      success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                       failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 /**
@@ -226,7 +226,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSURLSessionDataTask *)PATCH:(NSString *)URLString
                      parameters:(nullable id)parameters
-                        success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                        success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                         failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 /**
@@ -241,7 +241,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSURLSessionDataTask *)DELETE:(NSString *)URLString
                       parameters:(nullable id)parameters
-                         success:(nullable void (^)(NSURLSessionDataTask *task, id responseObject))success
+                         success:(nullable void (^)(NSURLSessionDataTask *task, id _Nullable responseObject))success
                          failure:(nullable void (^)(NSURLSessionDataTask * __nullable task, NSError *error))failure;
 
 @end
diff --git a/Tests/Tests/AFHTTPSessionManagerTests.m b/Tests/Tests/AFHTTPSessionManagerTests.m
index dc810f2bfd..f816b9aa50 100644
--- a/Tests/Tests/AFHTTPSessionManagerTests.m
+++ b/Tests/Tests/AFHTTPSessionManagerTests.m
@@ -185,4 +185,46 @@ - (void)testThatSerializationErrorGeneratesErrorAndNullTaskForGET {
 }
 
 
+# pragma mark - Rest Interface
+
+- (void)testThatSuccessBlockIsCalledFor200 {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Request should succeed"];
+    [self.manager
+     GET:@"status/200"
+     parameters:nil
+     success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
+         [expectation fulfill];
+     }
+     failure:nil];
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:nil];
+}
+
+- (void)testThatFailureBlockIsCalledFor404 {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Request should succeed"];
+    [self.manager
+     GET:@"status/404"
+     parameters:nil
+     success:nil
+     failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nullable error) {
+         [expectation fulfill];
+     }];
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:nil];
+}
+
+- (void)testThatResponseObjectIsEmptyFor204 {
+    __block id urlResponseObject = nil;
+    XCTestExpectation *expectation = [self expectationWithDescription:@"Request should succeed"];
+    [self.manager
+     GET:@"status/204"
+     parameters:nil
+     success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
+         urlResponseObject = responseObject;
+         [expectation fulfill];
+     }
+     failure:nil];
+    [self waitForExpectationsWithCommonTimeoutUsingHandler:nil];
+    XCTAssertNil(urlResponseObject);
+}
+
+
 @end