Ios 使用PUT请求时发生AFN网络错误，错误为400

我正在尝试使用PUT请求增加解析数据

-(void)requestHit {

AFHTTPClient *client = [[AFHTTPClient alloc]initWithBaseURL:[NSURL     URLWithString:kHBFParseAPIBaseURLString]];
[client setDefaultHeader:@"X-Parse-Application-Id" value:kHBFParseAPIApplicationId];
[client setDefaultHeader:@"X-Parse-REST-API-Key" value:kHBFParseAPIKey];

[client registerHTTPOperationClass:[AFJSONRequestOperation class]];

NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"Increment",@"__op", [NSNumber numberWithInt:100],@"amount",
                               nil];

NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:&error];

if (!jsonData) {
    NSLog(@"NSJSONSerialization failed %@", error);
}

NSString *json = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];

NSDictionary * params = [[NSDictionary alloc]initWithObjectsAndKeys: json, @"hot", nil];


[client putPath:self.shopping.objectId parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject){
    NSLog(@"Success %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Failed %@", error);
}];
}

我得到一个错误代码400。我知道400意味着糟糕的URL，但我在safari上检查了URL，我就可以访问该网站了。我在想，也许这本字典的编码不对，但没有线索。以下是Parse网站上增量的REST API旋度：

curl -X PUT \
-H "X-Parse-Application-Id: DWZFxindnjGtp3SCMmA4iGaYN55dgVDRmobt7mkC" \
-H "X-Parse-REST-API-Key: QbjhRMhVshPkJmEoDdpS3xAkNOofzLsUBlMBQETU" \
-H "Content-Type: application/json" \
-d '{"score":{"__op":"Increment","amount":1}}' \
https://api.parse.com/1/classes/GameScore/Ed1nuqPvcm

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请帮助~~

默认情况下，AFHTTPClient将使用AFFormURLParameterEncoding作为参数编码方式，因此您必须将其设置为AFJSONParameterEncoding

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某些java web服务器无法接收@_op:@1此类参数，您应该手动将其转换为@0或@1，这将避免400错误。试试看。

失败的错误域=com.alamofire.networking.Error Code=-1011 200-299中的预期状态代码，获得400 UserInfo=0x6b9edd0{nserrorfailingurkey=，NSLocalizedDescription=200-299中的预期状态代码，获得400}