预请求跨域配置

try
{
  string bucket = "examplebucket-1250000000"; //存储桶，格式：BucketName-APPID
  string key = "exampleobject"; //对象键
  string origin = "http://cloud.tencent.com";
  string accessMthod = "PUT";
  OptionObjectRequest request = new OptionObjectRequest(bucket, key, origin, accessMthod);
  //执行请求
  OptionObjectResult result = cosXml.OptionObject(request);
  //请求成功
  Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
  //请求失败
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  //请求失败
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}