libcurl resume support

Using libcurl, does anybody knows how to determine if a web server supports resuming?

I'm trying to make a开发者_StackOverflow中文版 custom update software which needs to determine if the web server supports resuming.

Thanks.

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I assume you mean HTTP and then there's really no good way to know until you try it.

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you can send a HEAD request firstly with RANGE header, then determine with the response header.