Exclude URL from the mixed content fixer in Really Simple SSL on child sites.
Snippet Type
Execute on Child Sites
Snippet
function rsssl_exclude_http_url($html) {
$html = str_replace("https://www.domain.com", "http://www.domain.com", $html);
return $html;
}
add_filter("rsssl_fixer_output","rsssl_exclude_http_url");