ModHeader - Modify HTTP headers
Modify HTTP request headers, response headers, and redirect URLs
Redirect URLs, modify HTTP headers, test API calls, and unblock CORS — all from one popup.
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Goblinmod is a developer utility extension to test web integrations faster. Create rule groups to redirect requests, modify request/response headers, apply CORS response headers, and run HTTP calls directly from the popup. Rules are easy to toggle, duplicate, reorder, and organize by group. Patterns support wildcard matching with * for quick setup. All configuration is stored locally in the browser.
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Modify HTTP request headers, response headers, and redirect URLs
Intercept Requests and add custom rules to modify request/response headers, block/redirect requests, modify query params.
Modify HTTP headers, block assets or domains & redirect requests. Organise rules by folder and tab, optionally scope to domains.
Modify HTTP request headers, response headers, and redirect URLs
Modify HTTP request headers for specific URLs
Intercept, mock, and modify API requests directly in your browser. No server needed. 100% local and secure.