How do you add a custom http header?

问题:

I'm looking to add custom http headers to a Ruby on Rails app that is currently hosted on Heroku.

回答1:

Use:

response.headers['HEADER NAME'] = 'HEADER VALUE'

either in a specific method or to a before_filter method of your application controller depending on whether you need this to be added in a specific or to all of your responses.

UPDATE for Rails 5 - February 24th, 2018

As noted by @BrentMatzelle in the comments, for Rails 5:

response.set_header('HEADER NAME', 'HEADER VALUE')

回答2:

In rails 5, the following solution works (in action methods)

response.set_header("Header-Name", "Header value")

Reference: edgeapi

回答3:

In rails 4, set the response headers in the application.rb or respective environment files. Once you done that, you can override the header value wherever you required in the controller. Refer this url for more details.

回答4:

In Rails 3 or above, simply

headers['Header-Name'] = 'header value'

works in controllers. This is even the recommended way; according to the documentation,

Response is mostly a Ruby on Rails framework implementation detail, and should never be used directly in controllers. Controllers should use the methods defined in ActionController::Base instead. For example, if you want to set the HTTP response’s content MIME type, then use ActionController::Base#headers instead of Response#headers.

And this is still true in Rails 5.2.

回答5:

In rails 4 works following:

class API::V1::BaseController 
  after_action :set_version_header

  protected
    def set_version_header
        response.headers['X-ComanyName-Api-Version'] = 'V1'
    end
end