CFDictionaryRef dicRef = CFNetworkCopySystemProxySettings();
CFStringRef proxyStr = CFDictionaryGetValue(dicRef, kCFNetworkProxiesHTTPProxy);
NSString *proxy = (__bridge NSString *)(proxyStr);

+ (BOOL)getProxyStatus {
    NSDictionary *proxySettings = NSMakeCollectable([(NSDictionary *)CFNetworkCopySystemProxySettings() autorelease]);
    NSArray *proxies = NSMakeCollectable([(NSArray *)CFNetworkCopyProxiesForURL((CFURLRef)[NSURL URLWithString:@"http://www.baidu.com"], (CFDictionaryRef)proxySettings) autorelease]);
    NSDictionary *settings = [proxies objectAtIndex:0];
    
    NSLog(@"host=%@", [settings objectForKey:(NSString *)kCFProxyHostNameKey]);
    NSLog(@"port=%@", [settings objectForKey:(NSString *)kCFProxyPortNumberKey]);
    NSLog(@"type=%@", [settings objectForKey:(NSString *)kCFProxyTypeKey]);
    
    if ([[settings objectForKey:(NSString *)kCFProxyTypeKey] isEqualToString:@"kCFProxyTypeNone"])
    {
        //沒有設(shè)置代理
        return NO;
    }
    else
    {
        //設(shè)置代理了
        return YES;
    }
}

+ (void)load{
  Method method1 = class_getClassMethod([NSURLSession class],@selector(sessionWithConfiguration:));
  Method method2 = class_getClassMethod([NSURLSession class],@selector(px_sessionWithConfiguration:));
  method_exchangeImplementations(method1, method2);

  Method method3 = class_getClassMethod([NSURLSession class],@selector(sessionWithConfiguration:delegate:delegateQueue:));
  Method method4 = class_getClassMethod([NSURLSession class],@selector(px_sessionWithConfiguration:delegate:delegateQueue:));
  method_exchangeImplementations(method3, method4);
}

+ (NSURLSession*)px_sessionWithConfiguration:(NSURLSessionConfiguration*)configuration delegate:(nullable id)delegate delegateQueue:(nullable NSOperationQueue*)queue
{
      if(configuration) configuration.connectionProxyDictionary = @{};

  return [self px_sessionWithConfiguration:configuration delegate:delegate delegateQueue:queue];
}

+ (NSURLSession*)px_sessionWithConfiguration:(NSURLSessionConfiguration*)configuration
{

      if(configuration) configuration.connectionProxyDictionary = @{};

  return [self px_sessionWithConfiguration:configuration];
}

static NSArray * AFCertificateTrustChainForServerTrust(SecTrustRef serverTrust) {
   CFIndex certificateCount = SecTrustGetCertificateCount(serverTrust);
   NSMutableArray *trustChain = [NSMutableArray arrayWithCapacity:(NSUInteger)certificateCount];

   for (CFIndex i = 0; i < certificateCount; i++) {
       SecCertificateRef certificate = SecTrustGetCertificateAtIndex(serverTrust, i);
       [trustChain addObject:(__bridge_transfer NSData *)SecCertificateCopyData(certificate)];
   }

   return [NSArray arrayWithArray:trustChain];
}

NSString *cerPath = [[NSBundle mainBundle] pathForResource:@"certificate" ofType:@"cer"];//證書的路徑
NSData *certData = [NSData dataWithContentsOfFile:cerPath];
SSet<NSData*> * set = [[NSSet alloc]initWithObjects:certData  , nil];  // 本地證書內(nèi)容
// 服務(wù)端證書內(nèi)容
NSArray *serverCertificates = AFCertificateTrustChainForServerTrust(serverTrust);
for (NSData *trustChainCertificate in [serverCertificates reverseObjectEnumerator]) {
    if ([set containsObject:trustChainCertificate]) {
        // 證書驗證通過
    }
}

/**
 Whether or not to trust servers with an invalid or expired SSL certificates. Defaults to `NO`.
 */
@property (nonatomic, assign) BOOL allowInvalidCertificates;

/**
 Whether or not to validate the domain name in the certificate's CN field. Defaults to `YES`.
 */
@property (nonatomic, assign) BOOL validatesDomainName;

+ (AFHTTPSessionManager *)manager
{
    static AFHTTPSessionManager *manager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    
        NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
        manager =  [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config];

        AFSecurityPolicy *securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModePublicKey withPinnedCertificates:[AFSecurityPolicy certificatesInBundle:[NSBundle mainBundle]]];
        manager.securityPolicy = securityPolicy;
    });
    return manager;
}

URL url = new URL(urlStr);  
urlConnection = (HttpURLConnection) url.openConnection(Proxy.NO_PROXY); 

OkHttpClient client = new OkHttpClient().newBuilder().proxy(Proxy.NO_PROXY).build();