Form action downloads ruby script instead of running it - html

Question

I'm trying to send an email from a form made in HTML (haml). I've created a script called mailto.rb and I've set it as an action inside the form. The problem is that instead of running the code inside, when I press submit it just downloads the file (mailto.rb).
%form{:action => "mailto.rb", :method => "post"}
This is the code from the beginning of the form.
In HTML it would be:
<form method="post" action="mailto.rb">
Also, I've added the path to the ruby executable file on the first line of the ruby file.
#!~/.rbenv/shims/ruby
I know that It would be easier to use rails, but I'm not allowed. I have to use a ruby script.
PS: I'm using Middleman, and I work on localhost.

Answer 1

The idea is you can't POST request a static file with middleman. Same if you middleman build your application and pass everything to nginx/apache2. You'll get a 405 error
For example to use your script with nginx you have to install and use spawn-fcgi and fcgiwrap. Spawn a socket or a port from your ruby file and configure nginx to fastcgi_pass to fcgiwrap socket.
To use it with apache2, add your site to /var/www/html and put this in vhost:
AddHandler cgi-script .rb
<Directory /var/www/html>
Options +ExecCGI
</Directory>
Symlink cgid.conf and cgid.load to your mods-enabled folder and restart apache2.
Check error log for other problems, but it should work.
EDIT: In this case I'll choose apache2 over nginx. As a 3rd solution you should consider writing a rack script and pass it to unicorn.