internal dummy connection

Peng Yonghua <[email protected]>
Newsgroups gmane.comp.apache.mod-perl
Message-ID <[email protected]> 
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.
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