accf_http(9) on FreeBSD
The text fc41cd34e7a4, as FreeBSD 5.5-RELEASE, FreeBSD 5.4-RELEASE, FreeBSD 5.3-RELEASE, FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE shipped it.
buffer incoming connections until a certain complete HTTP requests arrive