Enabling SSL Causes Blank Page

ZenCart Version v1.5.5e
This version was upgraded using official upgrade procedure (I think)
https://www.doma-italian-market.com
When I try to enable SSL (by changing the configure.php as in the code below) the page goes blank.
When I try to change the configure.php back to the way that it was- everything is still blank.
(I take out https: and clear cache) I have to restore a backup file of configure.php to get it working again.
The SSL appears to be in place as when I go directly to https://www.doma-italian-market.com the page loads with https successfully.
When I change the configure.php as below, the site url shows as https: but is blank.
Currently I have https server as follows with ssl set to false: ```
define('HTTPS_SERVER', 'https://sperdie.fatcow.com/doma-italian-market');

That is not the proper route for my shared ssl BTW.  Its just what is there  now.  SSL was purchased for this domain with hosting company. 

// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg, http://www.yourdomain.com
// HTTPS_SERVER is your Secure webserver: eg, https://www.yourdomain.com
define('HTTP_SERVER', 'http://www.doma-italian-market.com');
define('HTTPS_SERVER', 'https:www//doma-italian-market.com’);
// Use secure webserver for checkout procedure?
define('ENABLE_SSL', ‘true’);

// NOTE: be sure to leave the trailing '/' at the end of these lines if you make changes!
// * DIR_WS_* = Webserver directories (virtual/URL)
// these paths are relative to top of your webspace ... (ie: under the public_html or httpdocs folder)
define('DIR_WS_CATALOG', '/');
define('DIR_WS_HTTPS_CATALOG', '/');
define('DIR_WS_IMAGES', 'images/');
define('DIR_WS_INCLUDES', 'includes/');
define('DIR_WS_FUNCTIONS', DIR_WS_INCLUDES . 'functions/');
define('DIR_WS_CLASSES', DIR_WS_INCLUDES . 'classes/');
define('DIR_WS_MODULES', DIR_WS_INCLUDES . 'modules/');
define('DIR_WS_LANGUAGES', DIR_WS_INCLUDES . 'languages/');
define('DIR_WS_DOWNLOAD_PUBLIC', DIR_WS_CATALOG . 'pub/');
define('DIR_WS_TEMPLATES', DIR_WS_INCLUDES . 'templates/');
define('DIR_WS_PHPBB', '/');

You need to change your HTTPS_SERVER definition to

define('HTTPS_SERVER', 'https://www.doma-italian-market.com’);

lat9:

You need to change your HTTPS_SERVER definition to

define('HTTPS_SERVER', 'https://www.doma-italian-market.com’);

Also the closing single quotation mark should be a single quotation of the same variety as the opening one in that path.  Note how it looks like a backwards single quote?

Be sure when editing the file that a plain text editor is being used and that the quote looks like: ' instead of ’ 

easiest/best is that when a functional configure.php file is used, that the single quote(s) are not removed when making the edit(s).