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The following code doesn't work:
url.c:parse_proxy sets the proxy name to "2a00" and overrides the port with 0, as it tries to parse "fac0:a000::7:13" as a port number. Is this a bug or expected behavior?
Unfortunately the documentation at http://curl.haxx.se/libcurl/c/CURLOPT_PROXY.html doesn't mention if IPv6 addresses have to be in square brackets even if they don't contain a port number or a scheme. If so, probably the documentation should reflect that and parse_proxy should return an error if the port string is invalid.
If the port number in the proxy string ended weirdly or the number is too large, skip it. Mostly as a means to bail out early if a "bare" IPv6 numerical address is used without enclosing brackets. Also mention the bracket requirement for IPv6 numerical addresses to the man page for CURLOPT_PROXY. Closes curl#415 Reported-by: Marcel Raad