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        if (my $error = $tx->req()->error()) {
            say $error->{code};
            say $error->{message};
        }

        # how to process request timeouts and other errors sucn as broken pipes, etc
        if (my $error = $tx->res()->error()) {
            say $error->{code};
            say $error->{message};
        }

        # makes reconnection if either slot was timeouted or was inactive too long
        $ua->refresh_connections();

        # closes everything
        $ua->close_all();

DESCRIPTION

    This library allows to make multiple HTTP/HTTPS request to the
    particular host in non-blocking mode.

    In comparison with HTTP::Async, this library doesn't make a new
    connection on each request.

    And in comparison with Mojo::AsyncAwait, it's more intuitive how
    to use it, and there is no any Singleton restrictions.

    The instance of this class can work only with one domain and scheme:
    either HTTP or HTTPS.

LICENSE

    This module is distributed under terms of Artistic Perl 5 license.

 new($class, %opts)

    The class constructor.

    host

      It's the obligatory option. Sets the name/address of remote host to be
      requested.

    port

      By default it's equal to 80. Sets the port number of remote point.

    slots

      By default it's equal to 5. Sets the maximum amount of slots. These
      slot will be filled one by one if required.

    ssl

      By default it's equal to 0 (means HTTP). Sets the scheme of requests:
      HTTP or HTTPS.

    ssl_opts

      It's a HashRef with options to control SSL Layer. See IO::Socket::SSL
      constructor arguments for details.

    connect_timeout

      By default it's equal to 1. Sets connection timeout in seconds.

      If it's equal to 0, then there will be no timeout restrictions.

    request_timeout

      By default it's equal to 1. Sets the time in seconds with granular
      accuracy as micro seconds. The awaiting time of response will be
      limited with this value.

      In case of 0 value there will be no time restrictions.

    sol_socket

      It's a HashRef with socket options. The possible keys are:

      so_keepalive - enables TCP KeepAlive on socket.
      The default value is 1 (means that option is enabled).

    sol_tcp

      WARNING: These options can be unsupported on some OS platforms.

      It's a HashRef with socket TCP-options.

      If some key is absent in HashRef then system settings will be used.

      The supported keys are shown below:

      tcp_keepidle - the time (in seconds) the connection needs to remain
      idle before TCP starts sending keepalive probes

      tcp_keepintvl - the time (in seconds) between individual keepalive
      probes

      tcp_keepcnt - the maximum number of keepalive probes TCP should send
      before dropping the connection.

    inactivity_conn_ts

      If last response was received inactivity_conn_ts seconds or more ago,
      then such slots will be destroyed.

      By default the value is 0 (disabled).

    debug

      Enables debug mode. The dbug messages will be printed in STDERR. By
      default the value is 0 (disabled).

 add ($self, $request_or_uri, $timeout = undef)

    Adds HTTP request into empty slot.

    If the request was successfully added, then it will return 1. Otherwise
    it will return 0.