How do I fix this error displayed in the browser console?
Mixed Content: The page at '<URL>' was loaded over HTTPS, but requested an insecure element '<URL>'. This request was automatically upgraded to HTTPS, For more information see <URL>
AI-generated summary
Users are troubleshooting a ‘Mixed Content’ error in their Discourse site, where an HTTPS-loaded page requests an insecure HTTP resource, likely an SVG logo. pfaffman suggests checking the Network tab in developer tools to identify the insecure asset and recommends updating it to HTTPS. poyrazdursuncan confirms the issue lies in the SVG logo file and questions whether the force_https setting should be enabled — noting it crashes the site. pfaffman clarifies that force_https should be set automatically via environment variables, not UI, and asks if the site is standard or recently rebuilt. Canapin suggests re-uploading the logo to update its URL, noting force_https is no longer in UI settings. pfaffman confirms it’s handled via env vars, except during a brief broken period. Ultimately, poyrazdursuncan marks the issue as solved, linking to a meta.discourse.org thread for further context.
Something on you site is referring to an asset with http, probably. It might be an image. It might be that a theme component is doing it
You should be able to tell in the network section of the developer tools.
Should the force_https setting be on? When I turn this setting on, the site crashes.
The problem is in the svg file. The extension of the site logo is svg.
So you’ll need to change that to point to https.
The force https should be set automatically, but if it’s crashing your site then you may have other issues.
I may be very wrong but that reminds me something. You can try removing your logo, then reuploading it so the full url may be updated.
The force https settings has be gone from the interface settings many versions ago though… 
(I’ll remove my message if it is nonsense to avoid misleading people using the search)
That’s because the standard install sets it in an environment variable (except for a time last fall when it was broken).
Has this site been rebuilt lately? Is it a standard install?
Solved.