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.\" ========================================================================
.\"
.IX Title "Mojo::IOLoop::Server 3pm"
.TH Mojo::IOLoop::Server 3pm 2026-05-02 "perl v5.40.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
Mojo::IOLoop::Server \- Non\-blocking TCP and UNIX domain socket server
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  use Mojo::IOLoop::Server;
\&
\&  # Create listen socket
\&  my $server = Mojo::IOLoop::Server\->new;
\&  $server\->on(accept => sub ($server, $handle) {...});
\&  $server\->listen(port => 3000);
\&
\&  # Start and stop accepting connections
\&  $server\->start;
\&  $server\->stop;
\&
\&  # Start reactor if necessary
\&  $server\->reactor\->start unless $server\->reactor\->is_running;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Mojo::IOLoop::Server accepts TCP/IP and UNIX domain socket connections for Mojo::IOLoop.
.SH EVENTS
.IX Header "EVENTS"
Mojo::IOLoop::Server inherits all events from Mojo::EventEmitter and can emit the following new ones.
.SS accept
.IX Subsection "accept"
.Vb 1
\&  $server\->on(accept => sub ($server, $handle) {...});
.Ve
.PP
Emitted for each accepted connection.
.SH ATTRIBUTES
.IX Header "ATTRIBUTES"
Mojo::IOLoop::Server implements the following attributes.
.SS reactor
.IX Subsection "reactor"
.Vb 2
\&  my $reactor = $server\->reactor;
\&  $server     = $server\->reactor(Mojo::Reactor::Poll\->new);
.Ve
.PP
Low-level event reactor, defaults to the \f(CW\*(C`reactor\*(C'\fR attribute value of the global Mojo::IOLoop singleton. Note that
this attribute is weakened.
.SH METHODS
.IX Header "METHODS"
Mojo::IOLoop::Server inherits all methods from Mojo::EventEmitter and implements the following new ones.
.SS generate_port
.IX Subsection "generate_port"
.Vb 1
\&  my $port = Mojo::IOLoop::Server\->generate_port;
.Ve
.PP
Find a free TCP port, primarily used for tests.
.SS handle
.IX Subsection "handle"
.Vb 1
\&  my $handle = $server\->handle;
.Ve
.PP
Get handle for server, usually an IO::Socket::IP object.
.SS is_accepting
.IX Subsection "is_accepting"
.Vb 1
\&  my $bool = $server\->is_accepting;
.Ve
.PP
Check if connections are currently being accepted.
.SS listen
.IX Subsection "listen"
.Vb 2
\&  $server\->listen(port => 3000);
\&  $server\->listen({port => 3000});
.Ve
.PP
Create a new listen socket. Note that TLS support depends on IO::Socket::SSL (2.009+).
.PP
These options are currently available:
.IP address 2
.IX Item "address"
.Vb 1
\&  address => \*(Aq127.0.0.1\*(Aq
.Ve
.Sp
Local address to listen on, defaults to \f(CW0.0.0.0\fR.
.IP backlog 2
.IX Item "backlog"
.Vb 1
\&  backlog => 128
.Ve
.Sp
Maximum backlog size, defaults to \f(CW\*(C`SOMAXCONN\*(C'\fR.
.IP fd 2
.IX Item "fd"
.Vb 1
\&  fd => 3
.Ve
.Sp
File descriptor with an already prepared listen socket.
.IP path 2
.IX Item "path"
.Vb 1
\&  path => \*(Aq/tmp/myapp.sock\*(Aq
.Ve
.Sp
Path for UNIX domain socket to listen on.
.IP port 2
.IX Item "port"
.Vb 1
\&  port => 80
.Ve
.Sp
Port to listen on, defaults to a random port.
.IP reuse 2
.IX Item "reuse"
.Vb 1
\&  reuse => 1
.Ve
.Sp
Allow multiple servers to use the same port with the \f(CW\*(C`SO_REUSEPORT\*(C'\fR socket option.
.IP single_accept 2
.IX Item "single_accept"
.Vb 1
\&  single_accept => 1
.Ve
.Sp
Only accept one connection at a time.
.IP tls 2
.IX Item "tls"
.Vb 1
\&  tls => 1
.Ve
.Sp
Enable TLS.
.IP tls_ca 2
.IX Item "tls_ca"
.Vb 1
\&  tls_ca => \*(Aq/etc/tls/ca.crt\*(Aq
.Ve
.Sp
Path to TLS certificate authority file.
.IP tls_cert 2
.IX Item "tls_cert"
.Vb 2
\&  tls_cert => \*(Aq/etc/tls/server.crt\*(Aq
\&  tls_cert => {\*(Aqmojolicious.org\*(Aq => \*(Aq/etc/tls/mojo.crt\*(Aq}
.Ve
.Sp
Path to the TLS cert file, defaults to a built-in test certificate.
.IP tls_key 2
.IX Item "tls_key"
.Vb 2
\&  tls_key => \*(Aq/etc/tls/server.key\*(Aq
\&  tls_key => {\*(Aqmojolicious.org\*(Aq => \*(Aq/etc/tls/mojo.key\*(Aq}
.Ve
.Sp
Path to the TLS key file, defaults to a built-in test key.
.IP tls_options 2
.IX Item "tls_options"
.Vb 1
\&  tls_options => {SSL_alpn_protocols => [\*(Aqfoo\*(Aq, \*(Aqbar\*(Aq], SSL_verify_mode => 0x00}
.Ve
.Sp
Additional options for IO::Socket::SSL.
.SS port
.IX Subsection "port"
.Vb 1
\&  my $port = $server\->port;
.Ve
.PP
Get port this server is listening on.
.SS start
.IX Subsection "start"
.Vb 1
\&  $server\->start;
.Ve
.PP
Start or resume accepting connections.
.SS stop
.IX Subsection "stop"
.Vb 1
\&  $server\->stop;
.Ve
.PP
Stop accepting connections.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mojolicious, Mojolicious::Guides, <https://mojolicious.org>.