I built Header Relay: a Chrome extension that captures response headers and replays them on later requests

Short summary

Header Relay is a Manifest V3 Chrome extension that captures response headers like session tokens and automatically attaches them to subsequent matching requests. It works around MV3's removal of blocking webRequest by using non-blocking observation paired with declarativeNetRequest rules for native header injection. The tool supports origin-scoped profiles, path exclusions, conflict detection, and keeps captured values in memory only with no external transmission.

• •Chrome extension captures response headers and replays them on matching requests automatically
• •Works within Manifest V3 constraints using non-blocking webRequest plus declarativeNetRequest rules
• •Security-conscious design: in-memory only, no external transmission, per-origin host permissions

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