DSmidge

When WP is opened through HTTPS, all local absolute links in content are replaced from HTTP to HTTPS. 
Additional hosts can be specified through admin interface (like graph.facebook.com which works on HTTP and on HTTPS). 
Options HOME and SITEURL shuld be changed to HTTPS when enabling this plugin.

HTTP to HTTPS link changer by Eyga.net

When WP is opened through HTTPS, all local absolute links in content are replaced from HTTP to HTTPS.

SecuPress

If you encounter the issue “cURL error 60: certificate problem: certificate has expired”, you may need to temporarily deactivate the SSL Check.
SecuPress SSL Fixer will do it for you in a small interface.

SecuPress SSL Fixer

Plugin qui fait ce qu'on lui demande et pour le coup dépanne bien.


Pratique et efficace

Temporarily fix the SSL Check to prevent "cURL error 60: certificate problem: certificate has expired"

HTTP to HTTPS link changer by Eyga.net vs SecuPress SSL Fixer