在Plack中安装“主机”：：Builder

Question

Plack：：建筑工人和这个答案的概要内容如下：

# in .psgi
use Plack::Builder;

my $app = sub { ... };

builder {
    mount "/foo" => builder {
        enable "Foo";
        $app;
    };

    mount "/bar" => $app2;
    mount "http://example.com/" => builder { $app3 };
};

我尝试了以下几点：

use Plack::Builder;
my $app1 = sub { return [200, ['Content-Type' => 'text/plain'], [ "Hello 1"] ]; };
my $app2 = sub { return [200, ['Content-Type' => 'text/plain'], [ "Hello 2"] ]; };
my $app3 = sub { return [200, ['Content-Type' => 'text/plain'], [ "Hello 3"] ]; };

builder {
        mount "/a1" => builder { $app1 };
        mount "http://myhost.com" => builder{ $app2 };
        mount "/" => builder{ $app3 };
}

但当试图用plackup运行它时，got：

加载/tmp/app.psgi:路径需要以/ at /home/cw/.anyenv/envs/plenv/versions/5.20.3/lib/perl5/site_perl/5.20.3/Plack/Builder.pm行108开始时出错。

怎么啦？

Answer 1

我在文档中没有明确提到这一点，但是除了主机名(例如http://myhost.com/foo )之外，您还必须包括一个路径组件。变化

mount "http://myhost.com" => builder{ $app2 };

至

mount "http://myhost.com/" => builder{ $app2 };

(即主机/上的myhost.com)

相关代码在Plack::App::URLMap中(mount简单地调用Plack：：App：：URLMap的map方法)：

if ($location =~ m!^https?://(.*?)(/.*)!) {
    $host     = $1;
    $location = $2;
}