diff --git a/modules/swagger-codegen/src/main/resources/objc/SWGApiClient.m b/modules/swagger-codegen/src/main/resources/objc/SWGApiClient.m
index f84d7b3f62..5b7fd03417 100644
--- a/modules/swagger-codegen/src/main/resources/objc/SWGApiClient.m
+++ b/modules/swagger-codegen/src/main/resources/objc/SWGApiClient.m
@@ -31,13 +31,13 @@ static bool loggingEnabled = true;
                                       diskSize: (unsigned long) diskSize {
     NSAssert(memorySize > 0, @"invalid in-memory cache size");
     NSAssert(diskSize >= 0, @"invalid disk cache size");
-    
+
     NSURLCache *cache =
     [[NSURLCache alloc]
      initWithMemoryCapacity:memorySize
      diskCapacity:diskSize
      diskPath:@"swagger_url_cache"];
-    
+
     [NSURLCache setSharedURLCache:cache];
 }
 
@@ -54,17 +54,17 @@ static bool loggingEnabled = true;
         // setup static vars
         // create queue
         sharedQueue = [[NSOperationQueue alloc] init];
-        
+
         // create pool
         _pool = [[NSMutableDictionary alloc] init];
-        
+
         // initialize URL cache
         [SWGApiClient configureCacheWithMemoryAndDiskCapacity:4*1024*1024 diskSize:32*1024*1024];
-        
+
         // configure reachability
         [SWGApiClient configureCacheReachibilityForHost:baseUrl];
     }
-    
+
     @synchronized(self) {
         SWGApiClient * client = [_pool objectForKey:baseUrl];
         if (client == nil) {
@@ -128,7 +128,7 @@ static bool loggingEnabled = true;
             return TRUE;
         else return FALSE;
     }];
-    
+
     if(matchingItems.count == 1) {
         if(loggingEnabled)
             NSLog(@"removing request id %@", requestId);
@@ -169,19 +169,19 @@ static bool loggingEnabled = true;
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusUnknown");
                 [SWGApiClient setOfflineState:true];
                 break;
-                
+
             case AFNetworkReachabilityStatusNotReachable:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusNotReachable");
                 [SWGApiClient setOfflineState:true];
                 break;
-                
+
             case AFNetworkReachabilityStatusReachableViaWWAN:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusReachableViaWWAN");
                 [SWGApiClient setOfflineState:false];
                 break;
-                
+
             case AFNetworkReachabilityStatusReachableViaWiFi:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusReachableViaWiFi");
@@ -202,7 +202,7 @@ static bool loggingEnabled = true;
                              queryParams:(NSDictionary*) queryParams {
     NSString * separator = nil;
     int counter = 0;
-    
+
     NSMutableString * requestUrl = [NSMutableString stringWithFormat:@"%@", path];
     if(queryParams != nil){
         for(NSString * key in [queryParams keyEnumerator]){
@@ -218,7 +218,7 @@ static bool loggingEnabled = true;
                 SWGQueryParamCollection * coll = (SWGQueryParamCollection*) queryParam;
                 NSArray* values = [coll values];
                 NSString* format = [coll format];
-                
+
                 if([format isEqualToString:@"csv"]) {
                     [requestUrl appendString:[NSString stringWithFormat:@"%@%@=%@", separator,
                         [SWGApiClient escape:key], [NSString stringWithFormat:@"%@", [values componentsJoinedByString:@","]]]];
@@ -274,7 +274,28 @@ static bool loggingEnabled = true;
       requestContentType: (NSString*) requestContentType
      responseContentType: (NSString*) responseContentType
          completionBlock: (void (^)(NSDictionary*, NSError *))completionBlock {
-    
+    // setting request serializer
+    if ([requestContentType isEqualToString:@"application/json"]) {
+        self.requestSerializer = [AFJSONRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"application/x-www-form-urlencoded"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"multipart/form-data"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else {
+        NSAssert(false, @"unsupport request type %@", requestContentType);
+    }
+
+    // setting response serializer
+    if ([responseContentType isEqualToString:@"application/json"]) {
+        self.responseSerializer = [AFJSONResponseSerializer serializer];
+    }
+    else {
+        self.responseSerializer = [AFHTTPResponseSerializer serializer];
+    }
+
     NSMutableURLRequest * request = nil;
     if (body != nil && [body isKindOfClass:[NSArray class]]){
         SWGFile * file;
@@ -291,7 +312,8 @@ static bool loggingEnabled = true;
             }
         }
         NSString * urlString = [[NSURL URLWithString:path relativeToURL:self.baseURL] absoluteString];
-        
+
+        // request with multipart form
         if(file != nil) {
             request = [self.requestSerializer multipartFormRequestWithMethod: @"POST"
                                                                    URLString: urlString
@@ -302,20 +324,30 @@ static bool loggingEnabled = true;
                                                            NSData* data = [params[key] dataUsingEncoding:NSUTF8StringEncoding];
                                                            [formData appendPartWithFormData: data name: key];
                                                        }
-                                                       
+
                                                        [formData appendPartWithFileData: [file data]
                                                                                    name: [file paramName]
                                                                                fileName: [file name]
                                                                                mimeType: [file mimeType]];
-                                                       
+
                                                    }
                                                                        error:nil];
         }
+        // request with form parameters
+        else {
+            NSString* pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
+            NSString* urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
+
+            request = [self.requestSerializer requestWithMethod:method
+                                                      URLString:urlString
+                                                     parameters:params
+                                                          error:nil];
+        }
     }
     else {
         NSString * pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
         NSString * urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
-        
+
         request = [self.requestSerializer requestWithMethod:method
                                                   URLString:urlString
                                                  parameters:body
@@ -337,11 +369,9 @@ static bool loggingEnabled = true;
         [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
     }
 
-    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
-
     if(body != nil) {
         if([body isKindOfClass:[NSDictionary class]] || [body isKindOfClass:[NSArray class]]){
-            [requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
+            [self.requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
         }
         else if ([body isKindOfClass:[SWGFile class]]) {}
         else {
@@ -353,16 +383,16 @@ static bool loggingEnabled = true;
             [request setValue:[headerParams valueForKey:key] forHTTPHeaderField:key];
         }
     }
-    [requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
-    
+    [self.requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+
     // Always disable cookies!
     [request setHTTPShouldHandleCookies:NO];
-    
-    
+
+
     if (self.logRequests) {
         [self logRequest:request];
     }
-    
+
     NSNumber* requestId = [SWGApiClient queueRequest];
     AFHTTPRequestOperation *op =
     [self HTTPRequestOperationWithRequest:request
@@ -380,14 +410,14 @@ static bool loggingEnabled = true;
                  userInfo[SWGResponseObjectErrorKey] = operation.responseObject;
              }
              NSError *augmentedError = [error initWithDomain:error.domain code:error.code userInfo:userInfo];
-             
+
              if(self.logServerResponses)
                  [self logResponse:nil forRequest:request error:augmentedError];
              completionBlock(nil, augmentedError);
          }
      }
      ];
-    
+
     [self.operationQueue addOperation:op];
     return requestId;
 }
@@ -400,6 +430,28 @@ static bool loggingEnabled = true;
                      requestContentType: (NSString*) requestContentType
                     responseContentType: (NSString*) responseContentType
                         completionBlock: (void (^)(NSString*, NSError *))completionBlock {
+    // setting request serializer
+    if ([requestContentType isEqualToString:@"application/json"]) {
+        self.requestSerializer = [AFJSONRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"application/x-www-form-urlencoded"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"multipart/form-data"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else {
+        NSAssert(false, @"unsupport request type %@", requestContentType);
+    }
+
+    // setting response serializer
+    if ([responseContentType isEqualToString:@"application/json"]) {
+        self.responseSerializer = [AFJSONResponseSerializer serializer];
+    }
+    else {
+        self.responseSerializer = [AFHTTPResponseSerializer serializer];
+    }
+
     NSMutableURLRequest * request = nil;
     if (body != nil && [body isKindOfClass:[NSArray class]]){
         SWGFile * file;
@@ -416,31 +468,43 @@ static bool loggingEnabled = true;
             }
         }
         NSString * urlString = [[NSURL URLWithString:path relativeToURL:self.baseURL] absoluteString];
-        
+
+        // request with multipart form
         if(file != nil) {
             request = [self.requestSerializer multipartFormRequestWithMethod: @"POST"
                                                                    URLString: urlString
                                                                   parameters: nil
                                                    constructingBodyWithBlock: ^(id<AFMultipartFormData> formData) {
-                                                       
+
                                                        for(NSString * key in params) {
                                                            NSData* data = [params[key] dataUsingEncoding:NSUTF8StringEncoding];
                                                            [formData appendPartWithFormData: data name: key];
                                                        }
-                                                       
+
                                                        [formData appendPartWithFileData: [file data]
                                                                                    name: [file paramName]
                                                                                fileName: [file name]
                                                                                mimeType: [file mimeType]];
-                                                       
+
                                                    }
                                                                        error:nil];
         }
+        // request with form parameters
+        else {
+            NSString* pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
+            NSString* urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
+
+            request = [self.requestSerializer requestWithMethod:method
+                                                      URLString:urlString
+                                                     parameters:params
+                                                          error:nil];
+        }
+
     }
     else {
         NSString * pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
         NSString * urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
-        
+
         request = [self.requestSerializer requestWithMethod: method
                                                   URLString: urlString
                                                  parameters: body
@@ -461,13 +525,11 @@ static bool loggingEnabled = true;
         NSLog(@"%@ cache disabled", path);
         [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
     }
-    
-    
-    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
+
 
     if(body != nil) {
         if([body isKindOfClass:[NSDictionary class]] || [body isKindOfClass:[NSArray class]]){
-            [requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
+            [self.requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
         }
         else if ([body isKindOfClass:[SWGFile class]]){}
         else {
@@ -479,12 +541,12 @@ static bool loggingEnabled = true;
             [request setValue:[headerParams valueForKey:key] forHTTPHeaderField:key];
         }
     }
-    [requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+    [self.requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+
 
-    
     // Always disable cookies!
     [request setHTTPShouldHandleCookies:NO];
-    
+
     NSNumber* requestId = [SWGApiClient queueRequest];
     AFHTTPRequestOperation *op = [self HTTPRequestOperationWithRequest:request
      success:^(AFHTTPRequestOperation *operation, id responseObject) {
@@ -502,15 +564,15 @@ static bool loggingEnabled = true;
                  userInfo[SWGResponseObjectErrorKey] = operation.responseObject;
              }
              NSError *augmentedError = [error initWithDomain:error.domain code:error.code userInfo:userInfo];
-             
+
              if(self.logServerResponses)
                  [self logResponse:nil forRequest:request error:augmentedError];
              completionBlock(nil, augmentedError);
          }
      }];
-    
+
     [self.operationQueue addOperation:op];
     return requestId;
 }
 
-@end
\ No newline at end of file
+@end
diff --git a/modules/swagger-codegen/src/main/resources/objc/api-body.mustache b/modules/swagger-codegen/src/main/resources/objc/api-body.mustache
index cafaf6ad2b..068cf5d3e5 100644
--- a/modules/swagger-codegen/src/main/resources/objc/api-body.mustache
+++ b/modules/swagger-codegen/src/main/resources/objc/api-body.mustache
@@ -68,8 +68,11 @@ static NSString * basePath = @"{{basePath}}";
     {{#pathParams}}[requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"{{baseName}}", @"}"]] withString: [SWGApiClient escape:{{paramName}}]];
     {{/pathParams}}
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[{{#consumes}}@"{{mediaType}}"{{#hasMore}}, {{/hasMore}}{{/consumes}}];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[{{#produces}}@"{{mediaType}}"{{#hasMore}}, {{/hasMore}}{{/produces}}];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     {{#queryParams}}if({{paramName}} != nil) {
@@ -116,7 +119,7 @@ static NSString * basePath = @"{{basePath}}";
     {{/bodyParam}}
     {{^bodyParam}}
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     {{#formParams}}
     {{#notFile}}
@@ -126,8 +129,10 @@ static NSString * basePath = @"{{basePath}}";
     if(bodyDictionary == nil) {
       bodyDictionary = [[NSMutableArray alloc] init];
     }
-    [bodyDictionary addObject:{{paramName}}];
-    {{paramName}}.paramName  = @"{{baseName}}";
+    if({{paramName}} != nil) {
+      [bodyDictionary addObject:{{paramName}}];
+      {{paramName}}.paramName  = @"{{baseName}}";
+    }
     {{/isFile}}
     if(bodyDictionary == nil) {
       bodyDictionary = [[NSMutableArray alloc] init];
@@ -172,4 +177,4 @@ static NSString * basePath = @"{{basePath}}";
 
 {{newline}}
 {{/operations}}
-@end
\ No newline at end of file
+@end
diff --git a/samples/client/petstore/objc/PetstoreClient/PetstoreClientTests/PetApiTest.m b/samples/client/petstore/objc/PetstoreClient/PetstoreClientTests/PetApiTest.m
index 7ad03afee1..6fb2b6e57c 100644
--- a/samples/client/petstore/objc/PetstoreClient/PetstoreClientTests/PetApiTest.m
+++ b/samples/client/petstore/objc/PetstoreClient/PetstoreClientTests/PetApiTest.m
@@ -154,7 +154,7 @@
 }
 
 - (void)testDeletePet {
-    XCTestExpectation *expectation = [self expectationWithDescription:@"testGetPetById"];
+    XCTestExpectation *expectation = [self expectationWithDescription:@"testDeletePet"];
 
     SWGPet* pet = [self createPet];
 
@@ -181,6 +181,42 @@
     [self waitForExpectationsWithTimeout:10.0 handler:nil];
 }
 
+- (void)testUploadFile {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"testUploadFile"];
+
+    NSString* str = @"teststring";
+    NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
+    
+    SWGFile * file = [[SWGFile alloc] initWithNameData: @"myFile.txt" mimeType:@"text/plain" data:data];
+    
+    [api uploadFileWithCompletionBlock:@1 additionalMetadata:@"special-metadata" file:file completionHandler:^(NSError *error) {
+        if(error) {
+            // good
+            XCTFail(@"expected a failure");
+            
+        }
+        else {
+            [expectation fulfill];
+        }
+    }];
+    [self waitForExpectationsWithTimeout:10.0 handler:nil];
+}
+
+- (void)TestUploadWithoutFile {
+    XCTestExpectation *expectation = [self expectationWithDescription:@"testUploadWithoutFile"];
+    
+    [api uploadFileWithCompletionBlock:@1 additionalMetadata:@"special-metadata" file:nil completionHandler:^(NSError *error) {
+        if(error) {
+            XCTFail(@"failed to upload");
+            
+        }
+        else {
+            [expectation fulfill];
+        }
+    }];
+    [self waitForExpectationsWithTimeout:10.0 handler:nil];
+}
+
 - (SWGPet*) createPet {
     SWGPet * pet = [[SWGPet alloc] init];
     pet._id = [[NSNumber alloc] initWithLong:[[NSDate date] timeIntervalSince1970]];
diff --git a/samples/client/petstore/objc/client/SWGApiClient.m b/samples/client/petstore/objc/client/SWGApiClient.m
index f84d7b3f62..5b7fd03417 100644
--- a/samples/client/petstore/objc/client/SWGApiClient.m
+++ b/samples/client/petstore/objc/client/SWGApiClient.m
@@ -31,13 +31,13 @@ static bool loggingEnabled = true;
                                       diskSize: (unsigned long) diskSize {
     NSAssert(memorySize > 0, @"invalid in-memory cache size");
     NSAssert(diskSize >= 0, @"invalid disk cache size");
-    
+
     NSURLCache *cache =
     [[NSURLCache alloc]
      initWithMemoryCapacity:memorySize
      diskCapacity:diskSize
      diskPath:@"swagger_url_cache"];
-    
+
     [NSURLCache setSharedURLCache:cache];
 }
 
@@ -54,17 +54,17 @@ static bool loggingEnabled = true;
         // setup static vars
         // create queue
         sharedQueue = [[NSOperationQueue alloc] init];
-        
+
         // create pool
         _pool = [[NSMutableDictionary alloc] init];
-        
+
         // initialize URL cache
         [SWGApiClient configureCacheWithMemoryAndDiskCapacity:4*1024*1024 diskSize:32*1024*1024];
-        
+
         // configure reachability
         [SWGApiClient configureCacheReachibilityForHost:baseUrl];
     }
-    
+
     @synchronized(self) {
         SWGApiClient * client = [_pool objectForKey:baseUrl];
         if (client == nil) {
@@ -128,7 +128,7 @@ static bool loggingEnabled = true;
             return TRUE;
         else return FALSE;
     }];
-    
+
     if(matchingItems.count == 1) {
         if(loggingEnabled)
             NSLog(@"removing request id %@", requestId);
@@ -169,19 +169,19 @@ static bool loggingEnabled = true;
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusUnknown");
                 [SWGApiClient setOfflineState:true];
                 break;
-                
+
             case AFNetworkReachabilityStatusNotReachable:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusNotReachable");
                 [SWGApiClient setOfflineState:true];
                 break;
-                
+
             case AFNetworkReachabilityStatusReachableViaWWAN:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusReachableViaWWAN");
                 [SWGApiClient setOfflineState:false];
                 break;
-                
+
             case AFNetworkReachabilityStatusReachableViaWiFi:
                 if(loggingEnabled)
                     NSLog(@"reachability changed to AFNetworkReachabilityStatusReachableViaWiFi");
@@ -202,7 +202,7 @@ static bool loggingEnabled = true;
                              queryParams:(NSDictionary*) queryParams {
     NSString * separator = nil;
     int counter = 0;
-    
+
     NSMutableString * requestUrl = [NSMutableString stringWithFormat:@"%@", path];
     if(queryParams != nil){
         for(NSString * key in [queryParams keyEnumerator]){
@@ -218,7 +218,7 @@ static bool loggingEnabled = true;
                 SWGQueryParamCollection * coll = (SWGQueryParamCollection*) queryParam;
                 NSArray* values = [coll values];
                 NSString* format = [coll format];
-                
+
                 if([format isEqualToString:@"csv"]) {
                     [requestUrl appendString:[NSString stringWithFormat:@"%@%@=%@", separator,
                         [SWGApiClient escape:key], [NSString stringWithFormat:@"%@", [values componentsJoinedByString:@","]]]];
@@ -274,7 +274,28 @@ static bool loggingEnabled = true;
       requestContentType: (NSString*) requestContentType
      responseContentType: (NSString*) responseContentType
          completionBlock: (void (^)(NSDictionary*, NSError *))completionBlock {
-    
+    // setting request serializer
+    if ([requestContentType isEqualToString:@"application/json"]) {
+        self.requestSerializer = [AFJSONRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"application/x-www-form-urlencoded"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"multipart/form-data"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else {
+        NSAssert(false, @"unsupport request type %@", requestContentType);
+    }
+
+    // setting response serializer
+    if ([responseContentType isEqualToString:@"application/json"]) {
+        self.responseSerializer = [AFJSONResponseSerializer serializer];
+    }
+    else {
+        self.responseSerializer = [AFHTTPResponseSerializer serializer];
+    }
+
     NSMutableURLRequest * request = nil;
     if (body != nil && [body isKindOfClass:[NSArray class]]){
         SWGFile * file;
@@ -291,7 +312,8 @@ static bool loggingEnabled = true;
             }
         }
         NSString * urlString = [[NSURL URLWithString:path relativeToURL:self.baseURL] absoluteString];
-        
+
+        // request with multipart form
         if(file != nil) {
             request = [self.requestSerializer multipartFormRequestWithMethod: @"POST"
                                                                    URLString: urlString
@@ -302,20 +324,30 @@ static bool loggingEnabled = true;
                                                            NSData* data = [params[key] dataUsingEncoding:NSUTF8StringEncoding];
                                                            [formData appendPartWithFormData: data name: key];
                                                        }
-                                                       
+
                                                        [formData appendPartWithFileData: [file data]
                                                                                    name: [file paramName]
                                                                                fileName: [file name]
                                                                                mimeType: [file mimeType]];
-                                                       
+
                                                    }
                                                                        error:nil];
         }
+        // request with form parameters
+        else {
+            NSString* pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
+            NSString* urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
+
+            request = [self.requestSerializer requestWithMethod:method
+                                                      URLString:urlString
+                                                     parameters:params
+                                                          error:nil];
+        }
     }
     else {
         NSString * pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
         NSString * urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
-        
+
         request = [self.requestSerializer requestWithMethod:method
                                                   URLString:urlString
                                                  parameters:body
@@ -337,11 +369,9 @@ static bool loggingEnabled = true;
         [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
     }
 
-    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
-
     if(body != nil) {
         if([body isKindOfClass:[NSDictionary class]] || [body isKindOfClass:[NSArray class]]){
-            [requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
+            [self.requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
         }
         else if ([body isKindOfClass:[SWGFile class]]) {}
         else {
@@ -353,16 +383,16 @@ static bool loggingEnabled = true;
             [request setValue:[headerParams valueForKey:key] forHTTPHeaderField:key];
         }
     }
-    [requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
-    
+    [self.requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+
     // Always disable cookies!
     [request setHTTPShouldHandleCookies:NO];
-    
-    
+
+
     if (self.logRequests) {
         [self logRequest:request];
     }
-    
+
     NSNumber* requestId = [SWGApiClient queueRequest];
     AFHTTPRequestOperation *op =
     [self HTTPRequestOperationWithRequest:request
@@ -380,14 +410,14 @@ static bool loggingEnabled = true;
                  userInfo[SWGResponseObjectErrorKey] = operation.responseObject;
              }
              NSError *augmentedError = [error initWithDomain:error.domain code:error.code userInfo:userInfo];
-             
+
              if(self.logServerResponses)
                  [self logResponse:nil forRequest:request error:augmentedError];
              completionBlock(nil, augmentedError);
          }
      }
      ];
-    
+
     [self.operationQueue addOperation:op];
     return requestId;
 }
@@ -400,6 +430,28 @@ static bool loggingEnabled = true;
                      requestContentType: (NSString*) requestContentType
                     responseContentType: (NSString*) responseContentType
                         completionBlock: (void (^)(NSString*, NSError *))completionBlock {
+    // setting request serializer
+    if ([requestContentType isEqualToString:@"application/json"]) {
+        self.requestSerializer = [AFJSONRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"application/x-www-form-urlencoded"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else if ([requestContentType isEqualToString:@"multipart/form-data"]) {
+        self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    }
+    else {
+        NSAssert(false, @"unsupport request type %@", requestContentType);
+    }
+
+    // setting response serializer
+    if ([responseContentType isEqualToString:@"application/json"]) {
+        self.responseSerializer = [AFJSONResponseSerializer serializer];
+    }
+    else {
+        self.responseSerializer = [AFHTTPResponseSerializer serializer];
+    }
+
     NSMutableURLRequest * request = nil;
     if (body != nil && [body isKindOfClass:[NSArray class]]){
         SWGFile * file;
@@ -416,31 +468,43 @@ static bool loggingEnabled = true;
             }
         }
         NSString * urlString = [[NSURL URLWithString:path relativeToURL:self.baseURL] absoluteString];
-        
+
+        // request with multipart form
         if(file != nil) {
             request = [self.requestSerializer multipartFormRequestWithMethod: @"POST"
                                                                    URLString: urlString
                                                                   parameters: nil
                                                    constructingBodyWithBlock: ^(id<AFMultipartFormData> formData) {
-                                                       
+
                                                        for(NSString * key in params) {
                                                            NSData* data = [params[key] dataUsingEncoding:NSUTF8StringEncoding];
                                                            [formData appendPartWithFormData: data name: key];
                                                        }
-                                                       
+
                                                        [formData appendPartWithFileData: [file data]
                                                                                    name: [file paramName]
                                                                                fileName: [file name]
                                                                                mimeType: [file mimeType]];
-                                                       
+
                                                    }
                                                                        error:nil];
         }
+        // request with form parameters
+        else {
+            NSString* pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
+            NSString* urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
+
+            request = [self.requestSerializer requestWithMethod:method
+                                                      URLString:urlString
+                                                     parameters:params
+                                                          error:nil];
+        }
+
     }
     else {
         NSString * pathWithQueryParams = [self pathWithQueryParamsToString:path queryParams:queryParams];
         NSString * urlString = [[NSURL URLWithString:pathWithQueryParams relativeToURL:self.baseURL] absoluteString];
-        
+
         request = [self.requestSerializer requestWithMethod: method
                                                   URLString: urlString
                                                  parameters: body
@@ -461,13 +525,11 @@ static bool loggingEnabled = true;
         NSLog(@"%@ cache disabled", path);
         [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
     }
-    
-    
-    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
+
 
     if(body != nil) {
         if([body isKindOfClass:[NSDictionary class]] || [body isKindOfClass:[NSArray class]]){
-            [requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
+            [self.requestSerializer setValue:requestContentType forHTTPHeaderField:@"Content-Type"];
         }
         else if ([body isKindOfClass:[SWGFile class]]){}
         else {
@@ -479,12 +541,12 @@ static bool loggingEnabled = true;
             [request setValue:[headerParams valueForKey:key] forHTTPHeaderField:key];
         }
     }
-    [requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+    [self.requestSerializer setValue:responseContentType forHTTPHeaderField:@"Accept"];
+
 
-    
     // Always disable cookies!
     [request setHTTPShouldHandleCookies:NO];
-    
+
     NSNumber* requestId = [SWGApiClient queueRequest];
     AFHTTPRequestOperation *op = [self HTTPRequestOperationWithRequest:request
      success:^(AFHTTPRequestOperation *operation, id responseObject) {
@@ -502,15 +564,15 @@ static bool loggingEnabled = true;
                  userInfo[SWGResponseObjectErrorKey] = operation.responseObject;
              }
              NSError *augmentedError = [error initWithDomain:error.domain code:error.code userInfo:userInfo];
-             
+
              if(self.logServerResponses)
                  [self logResponse:nil forRequest:request error:augmentedError];
              completionBlock(nil, augmentedError);
          }
      }];
-    
+
     [self.operationQueue addOperation:op];
     return requestId;
 }
 
-@end
\ No newline at end of file
+@end
diff --git a/samples/client/petstore/objc/client/SWGPetApi.m b/samples/client/petstore/objc/client/SWGPetApi.m
index fe3750119a..321e5cd2da 100644
--- a/samples/client/petstore/objc/client/SWGPetApi.m
+++ b/samples/client/petstore/objc/client/SWGPetApi.m
@@ -65,8 +65,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[@"application/json", @"application/xml", ];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -146,8 +149,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[@"application/json", @"application/xml", ];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -227,8 +233,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     if(status != nil) {
@@ -245,7 +254,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -304,8 +313,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     if(tags != nil) {
@@ -322,7 +334,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -382,8 +394,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"petId", @"}"]] withString: [SWGApiClient escape:petId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -394,7 +409,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -457,8 +472,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"petId", @"}"]] withString: [SWGApiClient escape:petId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[@"application/x-www-form-urlencoded", ];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -469,7 +487,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -533,8 +551,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"petId", @"}"]] withString: [SWGApiClient escape:petId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -547,7 +568,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -596,8 +617,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"petId", @"}"]] withString: [SWGApiClient escape:petId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[@"multipart/form-data", ];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -608,7 +632,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -624,8 +648,10 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     if(bodyDictionary == nil) {
       bodyDictionary = [[NSMutableArray alloc] init];
     }
-    [bodyDictionary addObject:file];
-    file.paramName  = @"file";
+    if(file != nil) {
+      [bodyDictionary addObject:file];
+      file.paramName  = @"file";
+    }
     
     if(bodyDictionary == nil) {
       bodyDictionary = [[NSMutableArray alloc] init];
@@ -664,4 +690,4 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
 
 
-@end
\ No newline at end of file
+@end
diff --git a/samples/client/petstore/objc/client/SWGStoreApi.m b/samples/client/petstore/objc/client/SWGStoreApi.m
index 4380c8e10c..84df4f9bf1 100644
--- a/samples/client/petstore/objc/client/SWGStoreApi.m
+++ b/samples/client/petstore/objc/client/SWGStoreApi.m
@@ -63,8 +63,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -75,7 +78,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -127,8 +130,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -223,8 +229,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"orderId", @"}"]] withString: [SWGApiClient escape:orderId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -235,7 +244,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -296,8 +305,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"orderId", @"}"]] withString: [SWGApiClient escape:orderId]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -308,7 +320,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -343,4 +355,4 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
 
 
-@end
\ No newline at end of file
+@end
diff --git a/samples/client/petstore/objc/client/SWGUserApi.m b/samples/client/petstore/objc/client/SWGUserApi.m
index 52338d0a3b..58f3291c2a 100644
--- a/samples/client/petstore/objc/client/SWGUserApi.m
+++ b/samples/client/petstore/objc/client/SWGUserApi.m
@@ -64,8 +64,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -145,8 +148,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -226,8 +232,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -308,8 +317,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     if(username != nil) {
@@ -328,7 +340,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -385,8 +397,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -397,7 +412,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -444,8 +459,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"username", @"}"]] withString: [SWGApiClient escape:username]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -456,7 +474,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -518,8 +536,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"username", @"}"]] withString: [SWGApiClient escape:username]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -600,8 +621,11 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     [requestUrl replaceCharactersInRange: [requestUrl rangeOfString:[NSString stringWithFormat:@"%@%@%@", @"{", @"username", @"}"]] withString: [SWGApiClient escape:username]];
     
 
-    NSString* requestContentType = @"application/json";
-    NSString* responseContentType = @"application/json";
+    NSArray* requestContentTypes = @[];
+    NSString* requestContentType = [requestContentTypes count] > 0 ? requestContentTypes[0] : @"application/json";
+
+    NSArray* responseContentTypes = @[@"application/json", @"application/xml"];
+    NSString* responseContentType = [responseContentTypes count] > 0 ? responseContentTypes[0] : @"application/json";
 
     NSMutableDictionary* queryParams = [[NSMutableDictionary alloc] init];
     
@@ -612,7 +636,7 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
     
     
 
-    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init]; 
+    NSMutableDictionary * formParams = [[NSMutableDictionary alloc]init];
 
     
     
@@ -647,4 +671,4 @@ static NSString * basePath = @"http://petstore.swagger.io/v2";
 
 
 
-@end
\ No newline at end of file
+@end