silence ActionController::UnknownHttpMethod exceptions

ignore_unknown_http_method.rb

# Avoid annoying ActionController::UnknownHttpMethod exceptions like:
#
#   ActionController::UnknownHttpMethod) "CONNECT, accepted HTTP methods are get, head, put, post, delete, and options"
#
# Install this file in app/metal and these requests will receive a 405
# "Method Not Allowed" status and will be logged under `info'.
class IgnoreUnknownHttpMethod
  def self.call(env)
    [
     if ActionController::Request::HTTP_METHODS.include?(env["REQUEST_METHOD"].downcase)
       404 # Not Found
     else
       Rails.logger.info("Ignoring unknown HTTP method; #{env.inspect}")
       
       405 # Method Not Allowed
     end, {"Content-Type" => "text/plain"}, []]
  end
end

Ahhhh....that makes sense. Thanks for the sharing!

How would you get this to work on Rails3?

It looks like you can modify Rails' exception to http status code mapping (at least in Rails 3.2) to do this:

 ActionDispatch::ExceptionWrapper.rescue_responses.merge!(
      'ActionController::UnknownHttpMethod' => :method_not_allowed)

It looks like this entry is in the map by default in Rails 4 so things should work out of the box there.