Header Relay Chrome Extension Automates API Token Relay Without a Proxy

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A developer has built Header Relay, a Manifest V3 Chrome extension designed to streamline API development by automatically capturing response headers and replaying them on subsequent requests. The tool addresses a common pain point where session tokens or trace IDs must be manually copied from DevTools and re-attached to each new request. Because Manifest V3 removed blocking webRequest listeners, the extension uses a split approach: a non-blocking observer captures response headers into session memory, while Chrome's declarativeNetRequest engine attaches them natively to outgoing requests. Header Relay supports both dynamic captured headers and static fixed headers, with origin-scoped profiles, path exclusions, and a URL probe for pre-save testing. Captured values are stored only in in-memory session storage and are cleared on browser restart or profile disable, with no external data transmission.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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