Header Override is an open-source browser extension for modifying request and response headers and cookies with local, URL-scoped rules, and switchable profiles. Test APIs, staging environments, authentication, feature flags, and customer-specific behavior without changing your code. Create profiles for different projects and environments, then switch between them instantly. No account, tracking, analytics, remote code, or external servers.
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Maker
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I built Header Override after seeing growing concerns about privacy and data handling in browser extensions. Tools that modify headers and cookies can access sensitive information, so I wanted to create a focused alternative where rules stay local and users remain in control.
Header Override makes API debugging, QA, staging checks, and cookie testing simple with URL-scoped rules and reusable profiles—without accounts, tracking, analytics, or external servers.
I’d love to hear how you use it and what would make it more useful.
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the local-only approach is honestly refreshing, especially the URL-scoped rules. feels like it was built by someone who actually deals with the headache of switching between staging environments all day.
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Maker
@vanessa_lam that’s what I was aiming for. Switching between staging environments was one of the main reasons I built the URL-scoped rules and local-only workflow. Thanks for noticing!
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The local rules and instant profile switching make this way cleaner than juggling browser flags. Genuinely useful for testing auth flows and staging endpoints without touching code.
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Maker
@godricgryffindor Thanks so much! That’s exactly the workflow I had in mind—quickly switching profiles and testing auth or staging behavior without changing application code. Glad you find it useful!
Really exciting to see Header Override launch! Browser extension to modify headers and cookies feels like a thoughtful approach. Congratulations, and best of luck today! 🚀
the local-only approach is honestly refreshing, especially the URL-scoped rules. feels like it was built by someone who actually deals with the headache of switching between staging environments all day.
@vanessa_lam that’s what I was aiming for. Switching between staging environments was one of the main reasons I built the URL-scoped rules and local-only workflow. Thanks for noticing!
The local rules and instant profile switching make this way cleaner than juggling browser flags. Genuinely useful for testing auth flows and staging endpoints without touching code.
@godricgryffindor Thanks so much! That’s exactly the workflow I had in mind—quickly switching profiles and testing auth or staging behavior without changing application code. Glad you find it useful!
Pazi
Really exciting to see Header Override launch! Browser extension to modify headers and cookies feels like a thoughtful approach. Congratulations, and best of luck today! 🚀
@zvonimir_sabljic1
That’s exactly what we set out to build. 🚀 Hope Header Override makes your workflow a little easier.