Apache Reference: mod_perl, PerlSendHeader

PerlSendHeader

Scan Script's Output for HTTP Headers
Syntax: PerlSendHeader on|off
Example: PerlSendHeader off
Since: Apache 1.2

When this directive is set to ``on'', it forces mod_perl to search for script output that looks like an HTTP header and automatically calls the API function send_http_header(). Turning it off saves a few CPU cycles.