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ViewHTTPHeaders.com - View HTTP header response for any web page.
HTTP Debugger - Debug HTTP API calls to a back-end and between back-ends. Easy of use, clean UI, and short ramp-up time. Not a proxy, no network issues!
HTTP Header Live - Displays the HTTP header. Edit it and send it.
Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
Fiddler - Fiddler is a debugging program for websites.