ios - How to fix memory leak in AFNetworking 3.1? -

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i'm testing app in instruments below code getting memory leak. please tell me how fix it.

nsurlsessionconfiguration *configuration = [nsurlsessionconfiguration defaultsessionconfiguration];  afhttpsessionmanager *manager = [[afhttpsessionmanager alloc]initwithsessionconfiguration:configuration];

you can try code: 

static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{          nsurlsessionconfiguration *sessionconfiguration = [nsurlsessionconfiguration defaultsessionconfiguration];         sessionconfiguration.httpmaximumconnectionsperhost = 10;          self.manager = [[afurlsessionmanager alloc] initwithsessionconfiguration:sessionconfiguration]; });

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