What is the maximum URL length you can pass to the Wininet function, HttpOpenRequest?
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I would suggest less than 2000 characters., but this KB article suggests Internet Explorer has a limit of 2083, which may well apply to your case too.
There are some max length consts in WinInet.h:
HttpOpenRequest does not have a maximum length but server software you are targeting will likely have a limit on your URL length.
(from Boutell.com)