swift:
varurlRequest =URLRequest(url: url!)
urlRequest.httpMethod="POST"
urlRequest.setValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type")
oc:
AFHTTPSessionManager*manager = [AFHTTPSessionManager sharedHTTPSession];
manager.requestSerializer= [AFHTTPRequestSerializer serializer];
//配置
[manager.requestSerializersetValue:@"application/x-www-form-urlencoded"forHTTPHeaderField:@"Content-Type"];
