How interesting! www.%33com.com also fails, so it isn't even being kicked into numeric addresses that does it - the parsers simply don't interpret the escape at that point.
So they're all broken?
Brian
Juergen Schoenwaelder wrote:
On Sun, Dec 05, 2004 at 11:54:07AM -0800, Bill Fenner wrote:
I've added the following pieces to the draft to try to capture the conversation so far.
[at the end of section 2.1:] o Use '%' in the URI Pro: + "%" is the same character. + Can copy and paste between forms. Con: + '%' is fundamentally special in URIs; parsers can be expected to be hard-wired to know that they start a percent-encoded octet. + IPvFuture ABNF doesn't permit bare percent. Issues: + Impossible to ensure that this exception to a fundamental URI rule would be handled properly by parsers.
I think it is useful to explore how generic these real-world URI parsers really are. I just tried to use
http://%3134.169.34.18/ and http://134.169.34.%31%38/
to access a web page, expecting that parsers would turn that into
http://134.169.34.18/
but I got lots of "host not found" messages. So it indeed looks like the real-world parsers I have access to pass hostnames/IP addresses to name lookup functions without preparsing them. I also tried things such as <http://%77%77%77.ietf.org/> without much luck. Please make your own tests.
The conclusion from my little series of tests is clear. The implementations I have tried do not interpret % escape sequences in the host portion of URIs and so the direction should be to simply allow % for IPv6 addresses with a zone identifier and to tell URI folks that they better do not mandate that % escape encoding is applied to the host portion of URIs since this is a) not really useful and b) not widely implemented. Of course, if you find implementations that do interpret % escape sequences in the host portion of URIs, your conclusions might be different.
/js
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