Chromium won't show PDF's served from your webserver?

Grey with grey If Chromium won't show PDF's inline when served from your webserver, it might be because you followed some security advice and set a "Content-Security-Policy"-header, containing the rule "default-src 'none'".

The symptom is that instead of showing the PDF, Chromium will just show a grey page with a tiny rectangle with rounded corners in the middle.

I fixed it by changing "none" to "self"; but I guess I should figure out which of the more specific policies it is that Chromium needs to be changed.

Some more digging reveals the I can keep "default-src 'none'" if I add "object-src 'self'", and Chromium will then display PDF's inline, so that's what I'm using now.

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