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Visiting https://en.wikipedia.org/wiki/Special:Captcha/image or e.g. http://en.wikipedia.org/w/index.php?title=Special%3ACaptcha%2Fimage&wpCaptchaId=167501434 results in a 500 which a) produces graph noise & alerts, b) is uncacheable. This isn't an internal server error as it's clearly properly handled on the server side. A 4xx range error code should be emitted; possibly even 404.

Visiting https://en.wikipedia.org/wiki/Special:Captcha/image or e.g. http://en.wikipedia.org/w/index.php?title=Special%3ACaptcha%2Fimage&wpCaptchaId=167501434 results in a 500 which a) produces graph noise & alerts, b) is uncacheable. This isn't an internal server error as it's clearly properly handled on the server side. A 4xx range error code should be emitted; possibly even 404.

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