import "ViewController.h"
@interface ViewController ()<NSURLSessionTaskDelegate>
@property (nonatomic, strong) NSURLSession *session;
@end
@implementation ViewController
(NSURLSession *)session {
if (!_session) {
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
_session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
}
return _session;
}(void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}-
(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
NSURL *url = [NSURL URLWithString:@"https://kyfw.12306.cn/otn/"];
[[self.session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"返回的字符串===%@",html);}] resume];
}
pragma mark ---NSURLSessionTaskDelegate代理---
-
(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler{// https工作原理
// 1.判断身份验证方式是否是服务器验证方法
if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
// 2.获取服务器证书
NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
// 3.信任服务器证书
completionHandler(0,credential);
}
}
@end
