Size of a remote URL

[Cameron Laird]

In article <41336331$0$65608$a1866201 at newsreader.visi.com>,
Grant Edwards  <grante at visi.com> wrote:
>On 2004-08-30, Justin <justin__devine at hotmail.com> wrote:
>
>> I want to track the download of files in a progress bar.  I asume I
>> need the final size to do that so I can compare it to the current size
>> on disk.
>
>Correct.
>
>> Le tme know if you know anything
>
>I know lots of things. :)  
>
>But, if the server doesn't tell you the content length in the
>HTTP headers, there's nothing you can do.
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I'll reinforce Grant's message:  there are quite a few Web addresses
whose server begins delivery of content before it, the server, has
yet calculated the whole "page", much less its size.  Your require-
ment, as stated, is simply not possible in full generality.