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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.
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.
WebSniffer - WebSniffer is an online tool to outlook HTTP request and response headers.
RequestHeaders.com - HTTP Header Checker Tools
Live HTTP Headers - The goal of this project is to adds information about the HTTP headers in three ways:
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!