Mojolicious Tutorial

Operate Mojolicious in a subdirectory

When deploying multiple applications in a production environment, it is recommended to deploy with reverse proxy + subdomain if subdomain operation is possible. Even if you don't think it's difficult, if you set up a virtual host for each subdomain, you don't need to change the application.

But if you use Mojolicious, you can operate it in a subdirectory. I will introduce how to operate with reverse proxy + subdirectory. The http server is Apache.

First is the Apache configuration file.

  <VirtualHost *: 80>
    ServerName perlcodesample.com
    <Proxy *>
      Order deny, allow
      Allow from all
    </Proxy>
    ProxyRequests Off
    ProxyPreserveHost On

    ProxyPass / app1 http: // localhost: 3000 / app1 keepalive = On
    ProxyPassReverse / app1 http: // localhost: 3000 / app1

    ProxyPass / app2 http: // localhost: 3001 / app2 keepalive = On
    ProxyPassReverse / app2 http: // localhost: 3001 / app2

    RequestHeader set X-ProxyPassReverse-UsePrefix "On"
    RequestHeader set X-Forwarded-HTTPS "0"
  </VirtualHost>

The reverse proxy is set for each subdirectory. X-ProxyPassReverse-UsePrefix is ​​an application-specific HTTP header.

Below is the application. I am rewriting the URL using before_dispatch. This is necessary for methods such as Mojolicious's router and url_for to recognize the correct URL.

use Mojolicious::Lite;

app->hook(before_dispatch => sub {
  my $self = shift;
  
  my $use_prefix
    = $self->req->headers->header('X-ProxyPassReverse-UsePrefix');
  
  if (defined $use_prefix && lc $use_prefix eq'on') {
    my $prefix = shift @{$self->req->url->path->parts};
    $self->req->url->base->path->parse("/ $prefix");
  }
});

get'/' =>'index';

get'/ foo' =>'foo';

app->start;

__DATA__

@@index.html.ep

URL: <a href="<%=url_for'/foo'%> "> Foo</a>

@@foo.html.ep

Foo

If you write the application in this way, you can operate it in a subdirectory.