HTTP Request Smuggling due to spaces in headers. The http parser accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS). (CVE-2021-22959) HTTP Request Smuggling when parsing the body. The parse ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions. (CVE-2021-22960)