WebSniffer
Modify Header Value (HTTP Headers)
HTTP-Repeater (HTTP/s Live Headers) (Beta)
Sky Live HTTP Headers
Smart Header
HTTP-TRACKER
HTTP Header Analyzer
HTTP Header Spy
Weer
Surge for Mac
Charles Proxy
HTTP Headers
James
mitmproxy
HTTP Toolkit
Cellist
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.
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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.
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
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.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
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 Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.