iOS post請求時報錯NSLocalizedDescription=Expected status code in (200-299), got 400

iOS post請求時報錯NSLocalizedDescription=Expected status code in (200-299), got 400

用AFNetworking postJSON資料的時候，剛開始提示我//Error Domain=NSURLErrorDomain Code=-1007 "too many HTTP redirects"，說是多重新導向問題

後來我改了之後又報錯//NSLocalizedDescription=Expected status code in (200-299), got 400

解決辦法：

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);
}];