Error 404 not found while sending get request to Shopify

Hello everyone !
When I send a get request with client-secret and client-password appending to header, I receive error 404 (Not found)

when I click on button to send request first time I get the following errror

but when I click on button for second and after I get the following error

My code

If I send the request from postman there is no problem

Please stop creating multiple topics for the same issue:

Also: You should invalidate this username/password combination.