Page not found - %20 in url

In the config file have you updated the base url to include /api ?

I've tried both 

PHP Code:

$config['base_url] = "https://someurl.com/api/"; 


and 

PHP Code:

$config['base_url] = ""; 


Neither helps. For some reason CI 3.0 insists on reading in the directory name as part of the URL when a space is present in the URL.