Header Modifier

Easily modify HTTP request and response headers for development, testing, and debugging

Header Modifier is a powerful yet easy-to-use Chrome extension that lets you modify HTTP request and response headers in real-time. Perfect for web developers, testers, and anyone working with web APIs. ✨ KEY FEATURES: • Modify Headers - Add, set, append, or remove any HTTP header on requests or responses • Block Requests - Block specific URLs or resources for testing • Redirect URLs - Automatically redirect requests to different destinations • Flexible Filtering - Target specific domains with URL pattern matching • Resource Type Control - Apply rules to specific types (XHR, images, scripts, etc.) • Quick Presets - Pre-configured templates for common scenarios: - CORS Fix: Enable cross-origin requests for local development - API Testing: Common headers for API development - Security Headers: Test security headers implementation - Cache Bypass: Disable caching for localhost • Import/Export - Save and share your header configurations • Smart Auto-complete - Suggestions for common HTTP headers • One-Click Toggle - Enable/disable all rules instantly 🎯 PERFECT FOR: • Fixing CORS issues during development • Testing API authentication with custom headers • Overriding User-Agent for browser testing • Adding security headers for testing • Bypassing cache during local development • Debugging web applications • API development and testing 🔒 PRIVACY: All configurations are stored locally on your device. No data is collected or transmitted to external servers. Built with Chrome Manifest V3