In WSL version 3.0.1 when diagnostics page checked its shows 'WSL end-points' as 'FAIL' and throw 404 error in the console but they work fine while testing social network signup or signin. After debugging I found that the URL for WSL end-point to test in diagnostics has some issue.
e.g see screenshot above for 404 URL
wp-content/plugins/wordpress-social-login/hybridauth/callbacks/.php?url=http%3A%2F%2Fexample.com
In WSL version 3.0.1 when diagnostics page checked its shows 'WSL end-points' as 'FAIL' and throw 404 error in the console but they work fine while testing social network signup or signin. After debugging I found that the URL for WSL end-point to test in diagnostics has some issue.
e.g see screenshot above for 404 URL
wp-content/plugins/wordpress-social-login/hybridauth/callbacks/.php?url=http%3A%2F%2Fexample.com
It should be
/wp-content/plugins/wordpress-social-login/hybridauth/?test=http://example.com
Code below is changing the URL and also giving 403 forbidden error while testing the end-point
https://github.com/miled/wordpress-social-login/blob/74d4ef9edbdb3d021dfcff921bf7a116d769d326/hybridauth/index.php#L24-L40
Commenting these lines fix the issue and WSL end-points test now Pass