$http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
echo $http_type . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; ?>

PHP judges http request or https request

/**
      * PHP determines whether the current protocol is HTTPS
      */
   function is_https() {
       if ( !empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {
           return true;
       } elseif ( isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https' ) {
           return true;
       } elseif ( !empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
           return true;
       }
       return false;
   }

$http_type = $this->is_https();
    if($http_type){
        echo "是https";
    }else{
        
        echo "是http";
    }

js judges http request or https request

var ishttps = 'https:' == document.location.protocol ? true: false;
if(ishttps){
alert('https');
}else{
alert('http');
}