Is the story HTML file you generated via the Publish to File option being hosted on the same web-server as the action_page.php file?
What type of Response will the web-server be returning? and what do you want the current page of story HTML file to do with that Response.
note: You ideally should include a method attribute on your form element, so there is no confusion about if it's a POST or a GET Request. (I am assuming you want to send a POST Request.)