Plack::Builder和
this answer的概要说：
# in .psgi
use Plack::Builder;
my $app = sub { ... };
builder {
mount "/foo" => builder {
enable "Foo";
$app;
};
mount "/bar" => $app2;
mount "http://example.com/" => builder { $app3 };
};
我尝试了以下方法：
use Plack::Builder;
my $app1 = sub { return [200,['Content-Type' => 'text/plain'],[ "Hello 1"] ]; };
my $app2 = sub { return [200,[ "Hello 2"] ]; };
my $app3 = sub { return [200,[ "Hello 3"] ]; };
builder {
mount "/a1" => builder { $app1 };
mount "http://myhost.com" => builder{ $app2 };
mount "/" => builder{ $app3 };
}
但是当试图用plackup运行时得到了：
Error while loading /tmp/app.psgi: Paths need to start with / at
/home/cw/.anyenv/envs/plenv/versions/5.20.3/lib/perl5/site_perl/5.20.3/Plack/Builder.pm
line 108.
怎么了？
解决方法
我没有在文档中明确提到这一点,但除主机名外还必须包含路径组件,例如： http://myhost.com/foo.更改
mount "http://myhost.com" => builder{ $app2 };
至
mount "http://myhost.com/" => builder{ $app2 };
(即/在主机myhost.com上)
相关代码在Plack::App::URLMap(mount只调用Plack :: App :: URLMap的map方法)：
if ($location =~ m!^https?://(.*?)(/.*)!) {
$host = $1;
$location = $2;
}