rails4 // ActionController::UnknownFormat

Question

Some bots or other external requests cause an ActionController::UnknownFormat error when redirecting

Is there a catch-all method to add somewhere in application_controller to handle those errors ?

A config spec to add a default method in request (if none specified) ?

Below an example of trace :

An ActionController::UnknownFormat occurred in main#index:

  ActionController::UnknownFormat
  app/controllers/main_controller.rb:17:in `index'


-------------------------------
Request:
-------------------------------

  * URL        : http://ownedurl.com/
  * HTTP Method: GET
  * IP address : 82.xxx.xxx.xxx
  * Parameters : {"controller"=>"main", "action"=>"index"}
  * Timestamp  : 2015-06-07 20:54:32 +0200
  * Server : servername
  * Rails root : /var/www/ownedurl.com/releases/208
  * Process: 29726

A get request would obviously work; yet it makes it occurs.

Experiences on this one appreciated thx a lot

score 1 · Accepted Answer · answered Jul 24 '15 at 10:16

1

This will handle a request without format :

rescue_from ActionController::UnknownFormat, with: :raise_not_found
def raise_not_found
    render(text: 'Not Found', status: 404)
end

answered Jul 24 '15 at 10:16

Ben

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score 0 · Answer 2 · edited May 23 '17 at 12:14

0

You can supply the :format to your routes itself to tell it what are the formats are valid and which are not.

Read some discussions on this and this answer.

edited May 23 '17 at 12:14

Community

1
1

answered Jun 07 '15 at 19:10

Arup Rakshit

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good point. main#index is actually the root of the app. what's the syntax to specify the format in it ? – Ben Jun 07 '15 at 19:11
@Ben did you check ?/ – Arup Rakshit Jun 07 '15 at 19:37
I'll check tomorrow. Added `root :to => 'main#index', :defaults => { :format => 'html' }`. Thing is, I don't know how to address a request without format with curl or other similar tool – Ben Jun 07 '15 at 22:22

rails4 // ActionController::UnknownFormat

2 Answers2