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    }
    return undef;
}

=pod

=head3 call

This method is called internally by the method to_app of
Plack::Component. The method fails unless this module
is running in a psgi.streaming environment. Otherwise,
it returns a subroutine, which calls the respond method.

=cut

sub call {
    my ($self, $env) = @_;
    if (! $env->{'psgi.streaming'}) { # after Lyra-Core/lib/Lyra/Trait/Async/PsgiApp.pm
        return [ 500, ["Content-Type" => "text/plain"], ["Internal Server Error (Server Implementation Mismatch)"] ];
    }
    return sub {
        my $responder = shift;
        $self->respond($responder, $env);
    }
}

=pod