function.php追加

//SSL設定
function http_to_https($the_content){
	$domain = $_SERVER["HTTP_HOST"];

	$src_http_single = "src=\'http://".$domain;
	$src_http_double = "src=\"http://".$domain;
	$src_https_single = "src=\'https://".$domain;
	$src_https_double = "src=\"https://".$domain;

	$href_http_single = "href=\'http://".$domain;
	$href_http_double = "href=\"http://".$domain;
	$href_https_single = "href=\'https://".$domain;
	$href_https_double = "href=\"https://".$domain;

	$http = array($src_http_single, $src_http_double, $href_http_single, $href_http_double);
	$https = array($src_https_single, $src_https_double, $href_https_single, $href_https_double);
	$the_content = str_replace($http, $https, $the_content);
	
	return $the_content;
}
add_filter('the_content', 'http_to_https');

.httaccsessを追加


<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
</IfModule>

SSLにするとwp-principle.net/ssl/

Thank you!  Word Press