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httptools.dev - Online tools for inspecting and debugging HTTP requests.
ViewHTTPHeaders.com - View HTTP header response for any web page.
RequestHeaders.com - HTTP Header Checker Tools
HTTP Header Live - Displays the HTTP header. Edit it and send it.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
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!