仅在 iPhone 上获取 HTTP 标头字段 [英] Get HTTP header fields only on iPhone

问题描述

我只想获取 URL 请求的标头.到目前为止，我一直在使用 stringWithContentsOfURL() 进行所有下载，但现在我只对标题感兴趣，并且下载整个文件不可行，因为它太大了.

I want to get only the headers of an URL request. I have been using stringWithContentsOfURL() for all downloading so far, but now I am only interested in the headers and downloading the entire file is not feasible as it is too large.

我找到了显示如何在收到响应后读取标头的解决方案，但是如何在请求中指定我只希望下载标头.跳过身体！

I have found solutions which show how to read the headers after the response has been receieved, but how do I specify in the request that I only wish to download headers. Skip the body!

谢谢.

推荐答案

我用过的.下面的代码是同步的，但您可以使用委托使其异步.

What I've used. The code below is synchronous but you can make it asynchronous using a delegate.

    NSMutableURLRequest *newRequest = ... //init your request...
    NSURLResponse *response=nil;
    NSError *error=nil;

    [newRequest setValue:@"HEAD" forKey:@"HTTPMethod"];
    [NSURLConnection sendSynchronousRequest:newRequest returningResponse:&response error:&error];
    [newRequest release];
    //Get MIME type from the response
    NSString* MIMEType = [response MIMEType];

编辑添加了用 NSMutableRequest 替换 NSURLRequest.

Edited to add replace NSURLRequest with NSMutableRequest.

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