Ferrum::PendingConnectionsError - what to do?

[yshmarov]

In my app I want to have a "generate pdf" controller action

Scenario:

when a user clicks

link_to 'Projects PDF', projects_path(format: :pdf)

it hits the controller action in PDF format, that opens a ferrum browser and visits the controller action in HTML format:

# app/controllers/projects_controller.rb
def index
  respond_to do |format|
    format.html
    format.pdf do
      browser = Ferrum::Browser.new
      browser.go_to(projects_path)
      browser.pdf
    end
  end
end

In this case I will often get the Ferrum::PendingConnectionsError error with Request to http://localhost:3000/projects reached server, but there are still pending connections: http:/localhost:3000/projects

Are there some best practices to follow to avoid this error?

[route]

I don't think it's a good idea to do that in the controller. It should be done in the background.

PendingConnectionsError only means that your request to the given url reached the server but browser didn't return event that main frame is rendered. Try to increase timeout and move it to the background.