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.\" ========================================================================
.\"
.IX Title "Plack::Loader 3"
.TH Plack::Loader 3 "2020-11-30" "perl v5.26.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Plack::Loader \- (auto)load Plack Servers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  # auto\-select server backends based on env vars
\&  use Plack::Loader;
\&  Plack::Loader\->auto(%args)\->run($app);
\&
\&  # specify the implementation with a name
\&  Plack::Loader\->load(\*(AqFCGI\*(Aq, %args)\->run($app);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Plack::Loader is a factory class to load one of Plack::Handler subclasses based on the environment.
.SH "AUTOLOADING"
.IX Header "AUTOLOADING"
\&\f(CW\*(C`Plack::Loader\->auto(%args)\*(C'\fR will autoload the most correct
server implementation by guessing from environment variables and Perl \s-1INC\s0
hashes.
.IP "\s-1PLACK_SERVER\s0" 4
.IX Item "PLACK_SERVER"
.Vb 1
\&  env PLACK_SERVER=AnyEvent ...
.Ve
.Sp
Plack users can specify the specific implementation they want to load
using the \f(CW\*(C`PLACK_SERVER\*(C'\fR environment variable.
.IP "\s-1PHP_FCGI_CHILDREN, GATEWAY_INTERFACE\s0" 4
.IX Item "PHP_FCGI_CHILDREN, GATEWAY_INTERFACE"
If there's one of FastCGI or \s-1CGI\s0 specific environment variables set,
use the corresponding server implementation.
.ie n .IP "%INC" 4
.el .IP "\f(CW%INC\fR" 4
.IX Item "%INC"
If one of AnyEvent, Coro or \s-1POE\s0 is loaded, the relevant
server implementation such as Twiggy, Corona or
POE::Component::Server::PSGI will be loaded, if they're available.