[EMAIL PROTECTED] ACL - access control lists

does apache servers use ACLs to check conditions based on the incoming http request URL, even before the header is parsed?

[EMAIL PROTECTED] http header parsing

has anyone found a scenarion, wherein based on a condition, the http header will NOT be parsed at all... what the steps involved, after an http request reaches the server,

[EMAIL PROTECTED] http response without parsing the header

does apache have a feature, where a response is given without parsing the header at all. also, if there is header parsing, which module should i check aa9160