问题是会有一个验证服务器证书的过程，如果不设置验证不过，请求就会报错。
URLSession的代理中有个- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * __nullable credential))completionHandler；方法，在这个方法中设置就好了。
具体代码如下：
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * __nullable credential))completionHandler {
// 判断是否是信任服务器证书
if(challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
// 告诉服务器，客户端信任证书
NSLog(@"protectionSpace = %@",challenge.protectionSpace);
NSLog(@"host:%@ ,realm:%@,port:%ld,proxyType:%@",challenge.protectionSpace.host,challenge.protectionSpace.realm,(long)challenge.protectionSpace.port,challenge.protectionSpace.proxyType);
// 创建凭据对象
NSURLCredential *credntial = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
// 通过completionHandler告诉服务器信任证书
completionHandler(NSURLSessionAuthChallengeUseCredential,credntial);
}
NSLog(@"protectionSpace = %@",challenge.protectionSpace);
}
记录一下。