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Find mixed content in the HTML of an HTTPS page

harmlessSEO checksdebian, ubuntu
Adjust the values, the command updates live
user@server
curl -s https://example.com/ | tr '\n' ' ' | grep -oiE '(src|srcset|data-src)="http://[^"]+"|<link[^>]+href="http://[^"]+"|url\(.?http://[^)]+\)' | sort -u

Searches the HTML for resources loaded via http://: src, srcset, <link href> and url() in inline CSS. Browsers block such content or show a warning, which costs trust and breaks the layout. Typical after switching to HTTPS when old URLs remain in the database.

Note: <link href="http://..."> also matches canonical or hreflang links, which are not mixed content. Resources referenced from external CSS and JS files are not covered. For WordPress, the entry on switching from http to https with WP-CLI helps.

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