Update base.py

Modification necessary for using CVAT from remote machines when accessing with FQDNs
See cvat-ai#1011 (comment)

This might just be a hacky workaround, compensating for a bug in proper parsing of the URL

"I believe the reason for this is that sometimes if the port number is :80 and the URL is not in the LAN (<HOST-IP>:port), but instead it is a Fully Qualified Domain Name (<FQDN>:port), the port 80 is redundant (mydomain.com:80) and the errors arise."

cvat/settings/base.py

@@ -192,10 +192,11 @@ def generate_ssh_keys():
 CORS_ALLOW_CREDENTIALS = True
 CSRF_TRUSTED_ORIGINS = [UI_HOST]
 UI_URL = '{}://{}'.format(UI_SCHEME, UI_HOST)
+UI_WITHOUT_PORT = UI_URL
 if len(UI_URL):
     UI_URL += ':{}'.format(UI_PORT)
 
-CORS_ORIGIN_WHITELIST = [UI_URL]
+CORS_ORIGIN_WHITELIST = [UI_URL, UI_WITHOUT_PORT]
 CORS_REPLACE_HTTPS_REFERER = True
 
 STATICFILES_FINDERS = [