'blocked by CORS :The 'Access-Control-Allow-Origin' header contains multiple values ', ', Laravel8

Access to XMLHttpRequest at 'http://localhost:8000/api/objectives' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed.

Solution 1:^[1]

First solution is to use this library https://github.com/fruitcake/laravel-cors

second one is adding header('Access-Control-Allow-Origin: *'); to your public/index.php that may fix the problem

Solution 2:^[2]

Head over to the cors.php in config folder and change this 'allowed_origins_patterns' => [], to 'allowed_origins_patterns' => ['*'],

Solution 3:^[3]

Try changing this 'supports_credentials' => false, to 'supports_credentials' => true, in the cors.php file located in the configs file Learn more

Solution 4:^[4]

I ran into similar issues. In my case, I fixed it by removing

Header set Access-Control-Allow-Origin "*"

from my .htaccess file.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	mj.akbarian
Solution 2	Arnoldkk
Solution 3	Arnoldkk
Solution 4	Md. Zubaer Ahammed

'blocked by CORS :The 'Access-Control-Allow-Origin' header contains multiple values '*, *', Laravel8

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]