How to disable forced redirects in magento

Start by removing all https from your config

UPDATE core_config_data
SET value=REPLACE(value, 'https', 'http') 
WHERE value LIKE 'https%';

Then remove the secure redirection

UPDATE core_config_data
SET value=0
WHERE path='web/secure/use_in_frontend' OR path='web/secure/use_in_adminhtml' OR path='web/url/redirect_to_base';

And the most important after this: delete content of

var/cache
var/full_page_cache
var/session