HMASTER – Privacy-first HTTP Header Manager for Chrome

Summary: HMASTER is a Chrome extension that enables developers to modify, add, or delete HTTP request and response headers with zero latency. It uses Manifest V3 technology and includes features like Regex filtering, one-click presets, Dark Mode, and multi-language support while maintaining full local privacy.

What it does

HMASTER allows easy manipulation of HTTP headers for requests and responses, supporting tasks like bypassing CORS, testing APIs, and simulating mobile user agents. It operates locally with Manifest V3 for improved performance.

Who it's for

It is designed for web developers needing quick, flexible HTTP header adjustments during development and testing.

Why it matters

It solves latency and privacy issues found in older header management tools by providing a modern, efficient, and local solution.