WebSniffer
Modify Header Value (HTTP Headers)
HTTP-Repeater (HTTP/s Live Headers) (Beta)
Sky Live HTTP Headers
HTTP Header Spy
HTTP-TRACKER
Smart Header
HTTP Header Analyzer
HTTP Debugger
Charles Proxy
Surge for Mac
HTTP Toolkit
Weer
mitmproxy
Proxyman.io
HTTP Headers
WebSniffer is an intelligence platform in the making that is going to track changes on the web and provide actionable insights to its users. The online tool can currently view HTTP response headers of any web page, do domain name, IP address lookups and provides user’s browser information such as IP address, user agent and more.
HTTP Debugger is a professional HTTP sniffer and analyzer for developers.
You can use HTTP Debugger to debug HTTP API calls to a back-end and between back-ends.
HTTP Debugger is very easy of use, with clean UI, and short ramp-up time.
It's not a proxy, and does not produce network issues!
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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
HTTP-Repeater (HTTP/s Live Headers) (Beta) - HTTP-Repeater (HTTP/s Live Headers) (Beta) is a browser extension that lets you capture browser requests and repeat the process in a loop automatically.
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
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.
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.