Header & Response Modifier

Override HTTP request/response headers, redirect URLs, mock responses, and modify request payloads.

Header & Response Modifier is an essential browser extension for Web Developers, API Engineers, and QA teams. Seamlessly modify HTTP headers, override server responses, redirect API calls, and mock endpoints without setting up local proxy servers. 🌟 Key Features 📝 Request Header Overrides: Modify outgoing headers like Authorization, User-Agent, Cookie, Origin, X-Custom-Header, etc. 📤 Response Header Overrides: Inject or strip incoming response headers (e.g., instant 1-click CORS Bypass with Access-Control-Allow-Origin: *). 🔀 URL Redirection: Reroute production endpoints to localhost, staging, or custom mock URLs. 🎭 Mock Responses: Instantly return custom JSON, HTML, or text payloads using high-performance data: URI redirection. ⚡ Built-in Presets: 1-click presets for CORS bypass, JWT Auth injection, Localhost redirection, and Mobile User-Agent emulation. 📥 Export & Import: Share rules easily across team members via JSON configuration files. 🧪 Interactive Rule Tester: Built-in test suite to verify header and mock rule execution in real-time.