Actions

An action defines what Chrome does when every enabled condition in a profile matches.

Action type	Result	Additional configuration
modifyHeaders	Modifies request or response headers	At least one valid header modification or synchronized cookie
redirect	Redirects the request	One enabled, non-empty destination URL
block	Blocks the request	None
allow	Exempts the request from lower-priority Headerly rules	None
upgradeScheme	Upgrades an insecure URL scheme	None
allowAllRequests	Allows a complete frame hierarchy	A frame resource type

Changing a profile's action type removes configuration that is incompatible with the new type. Conditions and priority remain unless changed separately.

block, allow, upgradeScheme, and allowAllRequests are complete actions by themselves. modifyHeaders and redirect are registered only after their required configuration is valid.