RK-A2

Every "gcf" has the following code.

headers = {
        'Access-Control-Allow-Origin': '*',  
        'Access-Control-Allow-Origin': get_allowed_origin(),  
        'Access-Control-Allow-Methods': 'POST',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Content-Type': 'application/json'
    }

create a set_headers method and replace above in every "gcf" with one line of code