Render 405 response for ActionController::UnknownHttpMethod exceptions

http_method_not_allowed

ActionController::UnknownHttpMethod exception found under rails 3.0.1

$ cat lib/http_method_not_allowed.rb  

# Render 405 response for ActionController::UnknownHttpMethod exceptions like:
# (ActionController::UnknownHttpMethod) "CONNECT, accepted HTTP methods are get, head, put, post, delete, and options"
# (ActionController::UnknownHttpMethod) "PROPFIND, accepted HTTP methods are get, head, put, post, delete, and options"
class HttpMethodNotAllowed
  def initialize(app)
    @app = app
  end

  def call(env)
    # irb(main):001:0> ActionController::Request::HTTP_METHODS # => ["get", "head", "put", "post", "delete", "options"]
    if !ActionController::Request::HTTP_METHODS.include?(env["REQUEST_METHOD"].downcase)
      Rails.logger.info("ActionController::UnknownHttpMethod: #{env.inspect}")
      [405, {"Content-Type" => "text/plain"}, ["Method Not Allowed"]]
    else
      @status, @headers, @response = @app.call(env)
      [@status, @headers, @response]
    end
  end
end

Use HttpMethodNotAllowed as middleware config/application.rb

config.middleware.use "HttpMethodNotAllowed"

Found this through Google and modified for Rails 4:

class HttpMethodNotAllowed
  def initialize(app)
    @app = app
  end

  def call(env)
    if !ActionDispatch::Request::HTTP_METHODS.include?(env["REQUEST_METHOD"].upcase)
      Rails.logger.info("ActionController::UnknownHttpMethod: #{env.inspect}")
      [405, {"Content-Type" => "text/plain"}, ["Method Not Allowed"]]
    else
      @status, @headers, @response = @app.call(env)
      [@status, @headers, @response]
    end
  end
end

👍

The HttpMethodNotAllowed did its job perfectly for me, but I needed to get the middleware close to the top of the stack to get it to work as expected. A config.middleware.insert_before(0, HttpMethodNotAllowed) did the trick. I'm on Rails 4.0.4.

Do you guys know of a more general way to suppress the 500 errors that Rack throws for things like this?

With the comment from dleve123 it worked :), thanks!

getting error
config/application.rb:69:inclass:Application': uninitialized constant HelloWorld::Application::HttpMethodNotAllowed (NameError)
`

fixed by adding the following on in application.rb
require File.expand_path('../../lib/http_method_not_allowed', __FILE__)

This works to suppress the error.

@dleve123 to suppress rack exceptions in general, set RACK_ENV to deployment.