Question

我正在使用-[NSURLConnection initWithRequest...]连接到服务器，当服务器端出现故障时，它将响应错误400，并在正文中显示消息。当没有错误时，我可以在didReceiveData中获取响应数据。但是当服务器返回错误400时，我在didReceiveData中没有收到任何错误消息。

但是，如果我使用-[NSURLConnection sendSynchronousRequest...]来执行相同的请求我从sendSynchronousRequest的返回值中获取错误数据。

我想从didReceiveData获取错误消息，但我不知道为什么我无法得到它。这有什么不同，有人可以帮助我吗？

这样我就可以收到错误消息：

NSURL *url = [NSURL URLWithString:@"http://devapi.xxx.com/v1/debug/error"];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] initWithURL:url
                                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                          timeoutInterval:240] autorelease];

[request setHTTPMethod:@"POST"];


[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

NSURLResponse *response = nil;
NSError *error = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:request
                                     returningResponse:&response
                                                 error:&error];


NSLog(@"STATUS:%d", [((NSHTTPURLResponse *)response) statusCode]);
NSLog(@"ERROR:%@", error);

这种方式我无法得到它：

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://devapi.xxx.com/v1/debug/error"]
                                                             cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                         timeoutInterval:240] autorelease];

[request setHTTPMethod:@"POST"];


[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
urlConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"statusCode:%d",((NSHTTPURLResponse *)response).statusCode);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[receivedData appendData:data];
NSLog(@"DATA:%@",[NSString stringWithCString:[receivedData bytes] encoding:NSASCIIStringEncoding]);
}

Answer 1

使用此委托方法处理此类错误。

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
      NSLog(@" Failed with error---%@",error);
}

Answer 2

我想我发现它发生了什么，当我在didReceiveResponse中收到错误状态代码时，我立即尝试获取数据并取消连接，但这是错的，因为didReceiveData仍然在didReceiveResponse之后接收。

非常感谢！

获取错误时NSURLConnection结果不同

2 个答案: