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Modify Header Value (HTTP Headers) - Modify Header Value (HTTP Headers) is a browser extension that allows you to add, modify or remove a header for any request to your preferred domains.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Sky Live HTTP Headers - Sky Live HTTP Headers is an open-source browser extension that visually displays HTTP requests and response headers from every website you visit.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
WebSniffer - WebSniffer is an online tool to outlook HTTP request and response headers.
Postman - The Collaboration Platform for API Development