added support for retrieving HTTP response headers in obj-c. Also added a +sharedAPI class method for easy initialization of an API class without passing headers

modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache

@@ -9,6 +9,13 @@ static bool cacheEnabled = false;
 static AFNetworkReachabilityStatus reachabilityStatus = AFNetworkReachabilityStatusNotReachable;
 static void (^reachabilityChangeBlock)(int);
 
+
+@interface {{classPrefix}}ApiClient ()
+
+@property (readwrite, nonatomic) NSDictionary *HTTPResponseHeaders;
+
+@end
+
 @implementation {{classPrefix}}ApiClient
 
 - (instancetype)init {
@@ -385,6 +392,8 @@ static void (^reachabilityChangeBlock)(int);
                                                                        if([[{{classPrefix}}Configuration sharedConfig] debug]) {
                                                                            [self logResponse:operation forRequest:request error:nil];
                                                                        }
+                                                                       NSDictionary *responseHeaders = [[operation response] allHeaderFields];
+                                                                       self.HTTPResponseHeaders = responseHeaders;
                                                                        completionBlock(response, nil);
                                                                    }
                                                                } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
@@ -398,6 +407,10 @@ static void (^reachabilityChangeBlock)(int);
 
                                                                        if([[{{classPrefix}}Configuration sharedConfig] debug])
                                                                            [self logResponse:nil forRequest:request error:augmentedError];
+                                                                       
+                                                                       NSDictionary *responseHeaders = [[operation response] allHeaderFields];
+                                                                       self.HTTPResponseHeaders = responseHeaders;
+
                                                                        completionBlock(nil, augmentedError);
                                                                    }
                                                                }];
@@ -441,6 +454,7 @@ static void (^reachabilityChangeBlock)(int);
                                                                    NSURL *file = [NSURL fileURLWithPath:filepath];
 
                                                                    [operation.responseData writeToURL:file atomically:YES];
+                                                                   self.HTTPResponseHeaders = headers;
                                                                    completionBlock(file, nil);
                                                                } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
 
@@ -455,7 +469,8 @@ static void (^reachabilityChangeBlock)(int);
                                                                        if ([[{{classPrefix}}Configuration sharedConfig] debug]) {
                                                                            [self logResponse:nil forRequest:request error:augmentedError];
                                                                        }
-
+                                                                       NSDictionary *responseHeaders = [[operation response] allHeaderFields];
+                                                                       self.HTTPResponseHeaders = responseHeaders;
                                                                        completionBlock(nil, augmentedError);
                                                                    }
                                                                }];

modules/swagger-codegen/src/main/resources/objc/ApiClient-header.mustache

@@ -31,6 +31,9 @@ extern NSString *const {{classPrefix}}ResponseObjectErrorKey;
 @property(nonatomic, assign) NSTimeInterval timeoutInterval;
 @property(nonatomic, readonly) NSOperationQueue* queue;
 
+/// In order to ensure the HTTPResponseHeaders are correct, it is recommended to initialize one {{classPrefix}}ApiClient instance per thread.
+@property(nonatomic, readonly) NSDictionary* HTTPResponseHeaders;
+
 /**
  * Clears Cache
  */

modules/swagger-codegen/src/main/resources/objc/api-body.mustache

@@ -11,6 +11,8 @@
 
 @implementation {{classname}}
 
+static {{classname}}* singletonAPI = nil;
+
 #pragma mark - Initialize methods
 
 - (id) init {
@@ -38,7 +40,6 @@
 #pragma mark -
 
 +({{classname}}*) apiWithHeader:(NSString*)headerValue key:(NSString*)key {
-    static {{classname}}* singletonAPI = nil;
 
     if (singletonAPI == nil) {
         singletonAPI = [[{{classname}} alloc] init];
@@ -47,6 +48,14 @@
     return singletonAPI;
 }
 
++({{classname}}*) sharedAPI {
+
+    if (singletonAPI == nil) {
+        singletonAPI = [[{{classname}} alloc] init];
+    }
+    return singletonAPI;
+}
+
 -(void) addHeader:(NSString*)value forKey:(NSString*)key {
     [self.defaultHeaders setValue:value forKey:key];
 }

modules/swagger-codegen/src/main/resources/objc/api-header.mustache

@@ -20,6 +20,7 @@
 -(void) addHeader:(NSString*)value forKey:(NSString*)key;
 -(unsigned long) requestQueueSize;
 +({{classname}}*) apiWithHeader:(NSString*)headerValue key:(NSString*)key;
++({{classname}}*) sharedAPI;
 {{#operation}}
 ///
 ///