RequestHeaders — Modify HTTP Headers

Add custom request headers with simple key-value rows and toggles.

RequestHeaders is a lightweight developer tool for adding and modifying HTTP request headers directly from your browser. Create key-value header rules, enable or disable individual headers, and organize different header sets into numbered profiles. Switch profiles instantly when testing different environments, accounts, feature flags, API configurations, or authentication setups. RequestHeaders is useful for developers, QA engineers, and API testers working with authorization headers, feature flags, localization, debugging values, and environment-specific configurations. All settings remain in your browser’s local extension storage. Enabled headers apply to HTTP and HTTPS requests while RequestHeaders is active.