https://modheader.com/
ModHeader - Modify HTTP headers
The most popular browser extension to modify headers
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https://requestly.com/products/http-interceptor/modify-http-headers/
Modify HTTP Headers for Free - Requestly
Jan 22, 2026 - Modify HTTP headers easily with Requestly for Free. Add, remove, or override request and response headers for debugging, testing, and development
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https://docs.nginx.com/nginx-gateway-fabric/traffic-management/request-response-headers/
Modify HTTP request and response headers | NGINX Documentation
Learn how to deliver, manage, and protect your applications using F5 NGINX products.
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