HTTP Header Exploitation

Technical guide on identifying and abusing HTTP header weaknesses in web applications, covering header reconnaissance and fuzzing, Vary header misuse, cache-poisoned denial-of-service (CPDoS) scenarios on Akamai and Cloudflare, abusing Akamai's ak_bmsc cookie, exploiting cache collisions to expose authenticated content, and common reverse-proxy header abuses; includes mitigation recommendations such as strict header validation, cache policy hardening, and proxy configuration hardening.