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ViewHTTPHeaders.com - View HTTP header response for any web page.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
HTTP Header Live - Displays the HTTP header. Edit it and send it.
Postman - The Collaboration Platform for API Development
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
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.