I saw many items like these in log,
::1 - - [05/Jun/2017:14:29:06 +0800] "OPTIONS * HTTP/1.0" 200 125 "-"
"Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 mod_apreq2-20090110/2.8.0
mod_perl/2.0.8 Perl/v5.18.2 (internal dummy connection)"
::1 - - [05/Jun/2017:14:29:07 +0800] "OPTIONS * HTTP/1.0" 200 125 "-"
"Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 mod_apreq2-20090110/2.8.0
mod_perl/2.0.8 Perl/v5.18.2 (internal dummy connection)"
::1 - - [05/Jun/2017:14:29:08 +0800] "OPTIONS * HTTP/1.0" 200 125 "-"
"Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 mod_apreq2-20090110/2.8.0
mod_perl/2.0.8 Perl/v5.18.2 (internal dummy connection)"
::1 - - [05/Jun/2017:14:29:09 +0800] "OPTIONS * HTTP/1.0" 200 125 "-"
"Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 mod_apreq2-20090110/2.8.0
mod_perl/2.0.8 Perl/v5.18.2 (internal dummy connection)"
what does it mean? why it exists? thanks.
