AFNetworkingErrorDomain Code=-1011 "Request failed: internal server error (500)"，IOS与API交互失败

原因一：IOS参数错误或Content-Type错误

参数错误

NSArray *groupNames = [[NSArray alloc] initWithObjects:groupName];NSMutableDictionary *params = [[NSMutableDictionary alloc]                               initWithObjects:@[guid, groupNames]                               forKeys:@[APISEND_BLOGGUID, APISEND_CONTACTGROUPKEY]];

Content-Type错误

manager.requestSerializer = [AFJSONRequestSerializer serializer];[manager.requestSerializer setValue:@"text/html" forHTTPHeaderField:@"Content-Type"];manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

参考文档：
http://www.4byte.cn/question/2823141/afnetworkingerrordomain-code-1011-request-failed-internal-server-error-500.html

原因二：相关文件夹或文件权限不够

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