iOS post请求时报错NSLocalizedDescription=Expected status code in (200-299), got 400

用AFNetworking postJSON数据的时候，刚开始提示我//Error Domain=NSURLErrorDomain Code=-1007 "too many HTTP redirects"，说是多重定向问题

后来我改了之后又报错//NSLocalizedDescription=Expected status code in (200-299), got 400

解决办法：

NSString *pathStr=@"http://api.XXX.com/provider" ;

    NSDictionary *jsonObject = @{@"key":@"d85c713ef6704d651c7ce",@"userId":@"123456654321"};

    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:pathStr]];

    httpClient.parameterEncoding=AFJSONParameterEncoding;

    [httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

    [httpClient setDefaultHeader:@"Accept" value:@"application/json"];



//    NSMutableDictionary *params=[[NSMutableDictionary alloc]init];
//
//    [params setObject:@"5dc1203cd89d85c713ef6704d651c7ce" forKey:@"key"];
//
//    [params setObject:@"123456654321" forKey:@"userId"];

    [httpClient postPath:@"accessToken" parameters:jsonObject success:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"data=====%@",jsonObject);
        //NSString *responseStr = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSLog(@"responseString:%@",operation.responseString);
        //NSLog(@"Request Successful, response '%@'", responseStr);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"[HTTPClient Error]: %@", error);
    }];

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iOS post请求时报错NSLocalizedDescription=Expected status code in (200-299), got 400

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