Were you previously accessing your WP site unencrypted (over http) and now you’re accessing the site behind a reverse proxy? If so, this is a known WP issue. There are two solutions. Refer to New Page: How to move WordPress site from HTTP to HTTPS · Issue #333 · WordPress/HelpHub · GitHub. This Caddy forum thread Help HTTPS to bitnami wordpress (mixed content error, need to force-rewrite http to https) will lead you to the first solution suggested in issue #333.
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