HTTP Request Smuggling Detection Tool
HTTP Request Smuggling is very critical and high severity vulnerability and was initially discovered by watchfire back in 2005 and later it got re-discovered by James Kettle - (albinowax) in August 2019 and presented his research at DEFCON 27 & Black-HAT USA. HRS vulnerability allows an attacker to smuggle an ambiguous HTTP-request as second request in one single HTTP-request to bypass the security controls of a website and gain access to unauthorized sensitive data and performs malicious activities. To know more about this vulnerability I'll highly suggest referring James well-documented research blogs at Portswigger website.
Introduction to Kali Linux
Kali Linux is a Debian-based Linux distribution operating system and it is widely used for Penetration Testing and Security Auditing. Kali contains many several tools which are mostly used for various information security tasks, such as Penetration Testing, Security research, Computer Forensics and Reverse Engineering.