AFNetworking网络请求头的设定

1. AFHTTPRequestOperationManager*manager=[AFHTTPRequestOperationManagermanager];
2. manager.securityPolicy=[AFSecurityPolicypolicyWithPinningMode:AFSSLPinningModeNone];
3. manager.requestSerializer=[AFJSONRequestSerializerserializer];
4. manager.responseSerializer=[AFJSONResponseSerializerserializer];
5. [manager.requestSerializersetValue:@"application/json"forHTTPHeaderField:@"Accept"];
6. [manager.requestSerializersetValue:@"application/json;charset=utf-8"forHTTPHeaderField:@"Content-Type"];