An HTTP server handler improperly continues to read and serve requests from a connection after sending a 2xx response to an HTTP/1 CONNECT request without hijacking the connection. Because a 2xx response to an HTTP/1 CONNECT is intended to convert the connection into a tunnel, the server should stop treating the connection as HTTP. This behavior can lead to request smuggling, a technique where an attacker interferes with the way a website processes sequences of HTTP requests, occurring when an intermediate proxy views the connection data as tunneled while the server interprets it as HTTP.