What does Header Relay do?
Header Relay captures response headers you select and adds fixed or captured header values to later browser requests that match your enabled profile.
Which requests can Header Relay modify?
Only requests matching an enabled profile's configured target origins are eligible. Excluded paths remain untouched.
Does Header Relay send data to an external server?
The extension does not send data to the developer, analytics providers, or unrelated servers. Configured header values are attached only to matching target origins; profiles, session state, and audit logs remain in the local Chrome profile. Separately, this documentation site uses GA4 only after you consent.
Where should I use Header Relay?
Header Relay is designed for API development and testing in local, staging, internal, and other controlled environments.