关于AFN 适配HTTPS配置及忽略证书方法

在实战开发过程中，通常使用HTTPS实现网络请求，有时候后台开发人员无法给你提供https验证证书，此时需要通过忽略（跳过）证书验证的方法去实现网络请求，下面是实现方法：
1.忽略证书配置方法

_sessionManager = [AFHTTPSessionManager manager];
    _sessionManager.requestSerializer = [AFJSONRequestSerializer serializer];
    _sessionManager.securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
    _sessionManager.securityPolicy.allowInvalidCertificates = YES;
    [_sessionManager.securityPolicy setValidatesDomainName:NO];

注意：如果请求的URL里面需要去掉端口号，否则会请求失败。
2.配置证书验证

+ (void)setSecurityPolicyWithCerPath:(NSString *)cerPath validatesDomainName:(BOOL)validatesDomainName {
   NSData *cerData = [NSData dataWithContentsOfFile:cerPath];
   AFSecurityPolicy *securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];
   securityPolicy.allowInvalidCertificates = YES;
   securityPolicy.validatesDomainName = validatesDomainName;
   securityPolicy.pinnedCertificates = [[NSSet alloc] initWithObjects:cerData, nil];
   [_sessionManager setSecurityPolicy:securityPolicy];
}