HTTP/2 become the standard defacto for the modern web and causes new application security risks. The HTTP2 request smuggling is one of a few HTTP/2 vulnerabilities with the high severity that raised last year. In this post, we will describe it in detail and suggest an open-source tool http2smugl that detects such kinds of vulnerabilities. HTTP/2 is the thing that already took an Internet. According to the Wikipedia: “The standardization effort was supported by Chrome,…