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Comment by simlevesque | Hacker News Reader

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If you wget the file you'll see this:

--2019-01-18 13:46:40-- http://acid3.acidtests.org/support-a.png

Resolving acid3.acidtests.org (acid3.acidtests.org)... 75.119.197.251

Connecting to acid3.acidtests.org (acid3.acidtests.org)|75.119.197.251|:80... connected.

HTTP request sent, awaiting response... 404 Not Found

2019-01-18 13:46:40 ERROR 404: Not Found.

This is by design. By the specs, browsers should not display a favicon if the file 404s. But that file contains a valid favicon, so rendering it is a failure. [source: Wikipedia]

The status is 404, but the body contains image data. I assume this is intentional.

Try curling it.

It's actually sending a PNG file, but with a 404 response.

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