HTTP Header Live
HTTP Header Live HTTP Header Live is the real-time inspector that echoes back full request and response headers for any URL you throw at it, perfect for debugging CORS or cache quirks on the spot. Enter a site, tweak methods or headers manually, and see the interplay unfold without proxy hassles. Free online tool, it's the transparent mirror for pentesters verifying server behaviors in a flash.
Explore →ModHeader
ModHeader ModHeader is the nimble Chrome extension that lets you inject, edit, or remove HTTP headers on the fly, turning any page into a custom request lab for testing auth bypasses or fingerprint tweaks. Save profiles for repeated scenarios, like spoofing user agents across sessions, and apply them with a click. Free with pro upgrades, it's the portable tinkerbox for solo explorers molding traffic to their will.
Explore →Burp Suite Inspector
Burp Suite Inspector Burp Suite's Inspector is the deep-dive dissector that parses and highlights HTTP headers in intercepted traffic, spotting anomalies like weak CSP or exposed tokens amid the noise. Use it in Repeater to mutate headers for vuln probing, with syntax coloring and search for surgical analysis. Free Community edition makes it accessible, positioning it as the pro-level scalpel for header forensics.
Explore →OWASP ZAP Header Manager
OWASP ZAP Header Manager OWASP ZAP's Header Manager is the open-source powerhouse for scripting header additions or overrides during scans, automating tests for things like missing X-Frame-Options in web apps. Integrate it into your proxy sessions to enforce custom behaviors, with rules for dynamic tweaks based on responses. Free and extensible, it's the collaborative companion for security researchers crafting header-driven attacks.
Explore →curl with -v
curl with -v curl's verbose mode (-v) is the unassuming terminal spy that unveils full header exchanges in raw text, from handshake to response, for pinpointing server leaks or proxy issues. Chain it with --head for lightweight probes or -H for custom injections, scripting endless variations from a bash loop. Built-in and free, it's the raw nerve for command-line diehards who live by the output.
Explore →HTTP Toolkit
HTTP Toolkit HTTP Toolkit is the intuitive desktop app that captures and rewrites headers in real-time across browsers, apps, and devices, with one-click rules for mocking or stripping sensitive ones. Visualize flows with timelines and diffs, making it a snap to debug API integrations or test header-based vulns locally. Free for basics with pro unlocks, it's the visual virtuoso for developers demystifying network chatter.
Explore →Charles Proxy
Charles Proxy Charles Proxy is the macOS-centric sniffer that breaks down headers with tree views and regex rewrites, ideal for inspecting mobile app traffic or enforcing custom CORS policies on the fly. Breakpoint requests to edit headers mid-flight, logging everything for post-analysis without performance hits. Paid but trial-friendly, it's the refined debugger for individuals chasing elusive header gremlins.
Explore →Fiddler
Fiddler Fiddler is the Windows-native header hawk that intercepts and auto-decrypts HTTPS traffic, letting you inspect, modify, or replay requests with drag-and-drop ease for thorough API audits. Use its composers to build header-heavy scenarios, like testing rate-limit evasions, with built-in scripting for automation. Free Classic version, it's the established eagle eye for .NET devs and pentesters alike.
Explore →RedBot