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Provide a default Content Security Policy (CSP) that is lenient yet secure #24961

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Just for now

@@ -21,7 +21,9 @@ class Railtie < Rails::Railtie # :nodoc:
config.action_dispatch.default_headers = {
'X-Frame-Options' => 'SAMEORIGIN',
'X-XSS-Protection' => '1; mode=block',
'X-Content-Type-Options' => 'nosniff'
'X-Content-Type-Options' => 'nosniff',
'Content-Security-Policy' =>
"default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src 'self' https:; style-src 'self' https: 'unsafe-inline'"

config.eager_load_namespaces << ActionDispatch
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