ASIFormDataRequest * request;
request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:@""]];
NSData *cerFile = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"d1" ofType:@"cer"]];
SecCertificateRef cert = SecCertificateCreateWithData(NULL, (__bridge CFDataRef)cerFile);
NSArray *array = [NSArray arrayWithObjects:(__bridge id)cert,nil];
[request setClientCertificates:array];
[request setValidatesSecureCertificate:NO];
[request startSynchronous];