added 'raw' serializer

src/ios/AFNetworking/AFURLRequestSerialization.m

@@ -1195,6 +1195,62 @@ typedef enum {
 
 @end
 
+
+#pragma mark -
+
+@implementation AFRAWRequestSerializer
+
++ (instancetype)serializer
+{
+    AFRAWRequestSerializer *serializer = [[self alloc] init];
+    return serializer;
+}
+
+#pragma mark - AFURLRequestSerialization
+
+- (NSURLRequest *)requestBySerializingRequest:(NSURLRequest *)request
+                               withParameters:(id)parameters
+                                        error:(NSError *__autoreleasing *)error
+{
+    NSParameterAssert(request);
+    
+    if ([self.HTTPMethodsEncodingParametersInURI containsObject:[[request HTTPMethod] uppercaseString]]) {
+        return [super requestBySerializingRequest:request withParameters:parameters error:error];
+    }
+    
+    NSMutableURLRequest *mutableRequest = [request mutableCopy];
+    
+    [self.HTTPRequestHeaders enumerateKeysAndObjectsUsingBlock:^(id field, id value, BOOL * __unused stop) {
+        if (![request valueForHTTPHeaderField:field]) {
+            [mutableRequest setValue:value forHTTPHeaderField:field];
+        }
+    }];
+    
+    if (parameters) {
+//        if (![mutableRequest valueForHTTPHeaderField:@"Content-Type"]) {
+//            [mutableRequest setValue:@"application/xml" forHTTPHeaderField:@"Content-Type"];
+//        }
+        
+        [mutableRequest setHTTPBody: [parameters dataUsingEncoding:NSUTF8StringEncoding]];
+    }
+    
+    return mutableRequest;
+}
+
+#pragma mark - NSSecureCoding
+
+- (instancetype)initWithCoder:(NSCoder *)decoder {
+    self = [super initWithCoder:decoder];
+    if (!self) {
+        return nil;
+    }
+    
+    return self;
+}
+
+@end
+
+
 #pragma mark -
 
 @implementation AFJSONRequestSerializer