Add 'private' to Cache-Control, match Rails expectations (mastodon#20608

)

Several controlers set quite intricate Cache-Control headers in order to
hopefully not be cached by any intermediate proxies or local caches. Unfortunately,
these headers are processed by ActionDispatch::HTTP::Cache in a way that squashes
and discards any values set alongside no-store other than private:
https://github.com/rails/rails/blob/8015c2c2cf5c8718449677570f372ceb01318a32/actionpack/lib/action_dispatch/http/cache.rb#L207-L209

We want to preserve no-store on these responses, but we might as well remove
parts that are going to be dropped anyway. As many of the endpoints in these
controllers are private to a particular user, we should also add "private",
which will be preserved alongside no-store.

app/controllers/api/base_controller.rb

@@ -129,7 +129,7 @@ def authorize_if_got_token!(*scopes)
   end
 
   def set_cache_headers
-    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+    response.headers['Cache-Control'] = 'private, no-store'
   end
 
   def disallow_unauthenticated_api_access?

app/controllers/auth/registrations_controller.rb

@@ -154,6 +154,6 @@ def require_rules_acceptance!
   end
 
   def set_cache_headers
-    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+    response.headers['Cache-Control'] = 'private, no-store'
   end
 end

app/controllers/oauth/authorizations_controller.rb

@@ -30,6 +30,6 @@ def truthy_param?(key)
   end
 
   def set_cache_headers
-    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+    response.headers['Cache-Control'] = 'private, no-store'
   end
 end

app/controllers/settings/base_controller.rb

@@ -14,7 +14,7 @@ def set_body_classes
   end
 
   def set_cache_headers
-    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+    response.headers['Cache-Control'] = 'private, no-store'
   end
 
   def require_not_suspended!