通过HTTP获取远程文件大小，而无需下载该文件 [英] Get remote file size via HTTP without downloading said file

问题描述

有什么方法可以获取(远程，http)文件的大小而无需实际下载吗?

Any way to get the size of a (remote, http) file without actually downloading it?

所有其他类似的问题似乎都围绕着从 didReceiveResponse:中的 NSURLResponse 对象中获取 expectedContentLength ，但是我不想下载该文件，我只想知道它有多大.

All other similar questions seem to revolve around grabbing the expectedContentLength from the NSURLResponse object in didReceiveResponse: but I don't want to download the file, I just want to know how big it is.

推荐答案

尝试发出HEAD请求，它仅返回包含Content-Length标头的标头.

Try to make HEAD request, it returns only headers with Content-Length header included.

~$ curl -I http://google.com/
HTTP/1.1 301 Moved Permanently
Location: http://www.google.com/
Content-Length: 219
...

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