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If you edit this question you'll see that both urls display in the preview - but the second one mixed-case which is not standards-compliant is (correctly IMO) eliminated in the 'live' version.

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How bizarre. HtTp:// ... – Matt Jan 26 '12 at 11:54
When I read the title of the question I thought it an unlikely scenario, but with only the first letter capitalized, I can see how this could happen. – Oded Jan 26 '12 at 12:18
@Obed, yes it did happen too on I used HtTp in the title as I was worried that Http would not be processed as odd by the average human brain. Mine didn't for a while though admittedly my brain is a little below average :-) – Jack Douglas Jan 26 '12 at 12:33
The client-side sanitizer uses case-insensitive regular expressions where the server-side one doesn't, which is easily fixed, but there may have been good reason for that. Even then, the client-side sanitizer leaves behind the URL as plaintext, so I'm unsure what the server-side is doing that causes it to be removed completely... – Tim Stone Jan 26 '12 at 12:55
@TimStone: autolinking in our Markdown versions happens by enclosing bare links in <http://anglebrackets> if they aren't, and then converting links in angle brackets to actual links. Since the server doesn't consider it a valid link, the <Http://foobar> stays as it is, and to the sanitizer, it looks like an HTML tag that gets killed. – balpha Jan 26 '12 at 13:12
@balpha Ohhhh, that makes sense. I see the difference in DoAutoLinks now. :) – Tim Stone Jan 26 '12 at 13:18
The RFC says For resiliency, programs interpreting URLs should treat upper case letters as equivalent to lower case in scheme names (e.g., allow "HTTP" as well as "http"). -- so I guess it's okay to allow mixed case. Of course we should do it consistently. – balpha Jan 26 '12 at 13:21

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