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When you visit a user's profile page, the actual username in the URL isn't supposed to matter. For example, all these URLs go to the same place:

However, if your username happens to end in the letters json, your profile page gets screwed up:

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No actual file names, and still the ghost of file extensions as meta-data haunts us... – Shog9 Mar 29 '10 at 19:30
Predicted fix: Disallow usernames ending in json – ベレアー アダム Mar 29 '10 at 19:57
Methinks that someone has been playing with a route to let people download data as JSON. Might want to adjust the regex in that routing constraint. – tvanfosson Mar 29 '10 at 20:03
@tvanfosson: Wouldn't it be funny if he just forgot to escape the dot? – mmyers Mar 29 '10 at 20:12
@ベレアー アダム why do you hate me and Martin Jajson? – perbert Mar 29 '10 at 20:12
@json: I don't hate you, I'm merely the harbinger of your doom. – ベレアー アダム Mar 29 '10 at 20:42
This receives Pollyanna's coveted LOL OF THE DAY seal. Congratulations. – Adam Davis Mar 29 '10 at 20:51
Badge request for lol-of-the-day in 3... 2... 1... – juan Mar 29 '10 at 21:05
Are the argonauts ok? – Andrew Grimm Mar 29 '10 at 22:28

I'm sorry, I won't do it again.

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Now you username has history like mine...… – juan Mar 29 '10 at 21:04
@downvoter My name changes have always had some kind of history ;)… – perbert Mar 29 '10 at 21:14
You won't do it for another 30 days, you mean. – Gnome Mar 30 '10 at 8:34

Also broken:

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...and that's probably a good thing. – tvanfosson Mar 29 '10 at 20:04
...but why that specific error? – Aarobot Mar 29 '10 at 21:18
totally unrelated bug – Jeff Atwood Mar 30 '10 at 8:18
web.config is actually an IIS config file to control web access to the folder in question. It's roughly the same as .htaccess is for Apache HTTPD. If it was public accessible, it might leak sensitive information about for example folders, configs, patterns, etc, we shouldn't know about. So that it errors is only good. – BalusC Mar 30 '10 at 16:54

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