Header Lab – Request Headers & Redirects

Modify request headers and redirect URLs with regex rules, reusable profiles, conflict detection, and local-only storage.

Modify request headers or redirect requests with URL regex rules, reusable profiles, conflict detection, import/export, and local-only storage. Detailed description: Header Lab is a request debugging tool designed for developers and testers. It lets you modify HTTP request headers or redirect matched requests to local, staging, or other development environments. If you frequently switch between local development, testing, and production environments, Header Lab lets you save each setup as a reusable profile. You can switch environments without repeatedly changing proxy settings or rewriting request rules. Key features: Match requests using URL regular expressions Add multiple request headers to each URL rule Redirect matched requests to local or alternative URLs Create and manage reusable environment profiles Reorder profiles and URL rules to control priority Detect rules that may override one another Duplicate profiles and URL rules Import and export portable JSON backups Follow the system light or dark theme Use the interface in English or Simplified Chinese Why install Header Lab: Header Lab keeps request headers, redirect targets, and URL matching rules together in one focused interface. It reduces repetitive setup and makes API debugging, environment switching, and troubleshooting faster. Whether you need to test a local API, verify a staging environment, simulate specific request headers, or reuse configurations across projects, Header Lab helps you complete the task quickly and consistently. Privacy: No account is required No browsing history or request logs are collected Your configurations are never uploaded All settings remain in Chrome’s local storage No remote code is loaded or executed Header Lab uses Chrome’s Declarative Net Request API to apply the rules you create. Invalid drafts remain available for editing but are not applied to browser requests.