objective-c - NSUrlSessionTaskDelegate 服务器响应

Question

我正在使用 NSUrlSessionTaskDelegate 将文件上传到服务器，但服务器代码没有在 didCompleteWithError 中返回。这与苹果文档相符:

Server errors are not reported through the error parameter. The only errors your delegate receives through the error parameter are client-side errors, such as being unable to resolve the hostname or connect to the host.

但是有没有其他方法可以得到服务器错误，比如 400 Bad Request 之类的？因为即使我收到错误的请求，现在每个文件上传都是成功的..

Answer 1

像这样的东西应该可以工作。但我没有测试它。它作为答案发布只是因为更简单的代码格式......

- (void)URLSession:(NSURLSession *)session
              task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error
{
    if (!error)
    {
        NSHTTPURLResponse *response = task.response;

        NSLog(@"StatusCode: %d",response.statusCode);

        if (response.statusCode != 200) //note that other 2xx codes might be valid
        {
            //....
        }
    }
    else
    {
        NSLog(@"Error: %@",error.description);
    }
}