**Summary:** The `llhttp` parser in the `http` module in Node 16.3.0 ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) when a Node server is put behind an Apache Traffic Server (ATS) 9.0.0 proxy. **Description:** In the `chunked` transfer encoding format there can be a so called chunk extension after each chunk size. Example: ``` GET...