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

问题描述

我想只获取网址请求的标头。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是不可行的，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.

我找到了解决方案，显示在收到响应后如何读取标题，但如何在请求中指定我只想下载标题。撇开身体！

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

我是什么用过的。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];

编辑为使用NSMutableRequest添加替换NSURLRequest。

Edited to add replace NSURLRequest with NSMutableRequest.

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