How can I use Rails routes to redirect from one domain to another?

Question

My app used to run on foo.tld but now it runs on bar.tld. Requests will still come in for foo.tld, I want to redirect them to bar.tld.

How can I do this in rails routes?

you can do it in application_controller: if request.host == 'some.site' redirect_to url_for(host: 'site', subdomain: 'another'), status: :moved_permanently end — mmike, Oct 20 '16 at 08:30

score 44 · Answer 1 · edited Dec 04 '13 at 22:43

44

This works in Rails 3.2.3

constraints(:host => /foo.tld/) do
  match "/(*path)" => redirect {|params, req| "http://bar.tld/#{params[:path]}"}
end

This works in Rails 4.0

constraints(:host => /foo.tld/) do
  match "/(*path)" => redirect {|params, req| "http://bar.tld/#{params[:path]}"},  via: [:get, :post]
end

edited Dec 04 '13 at 22:43

Professor Todd

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answered Jun 06 '12 at 17:32

Lukas Eklund

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For me this worked everywhere except the home page. The solution is good enough for me. Thank you very much. – Professor Todd Oct 12 '12 at 20:33
1

The splat rout by itself matches a nonempty string, so root URL won't be matched. Just add the parentheses: `match "/(*path)"...` – Janko May 15 '13 at 16:25
1

Rails 4: add `via: [:get, :post]` to the `match` options – meatrobot Nov 04 '13 at 23:48
8

Use // instead of http:// to ensure the redirect is protocol independent and works for http as well as for https. – Van der Hoorn Feb 27 '14 at 10:01
Curious as to why not use: "via: [:get, :post, :put, :patch, :delete]" – justingordon Mar 12 '15 at 00:00
@justingordon [This comment](http://stackoverflow.com/questions/4372896/rails-ensuring-www-is-in-the-url#comment4763365_4373733) on a similar question suggests that `GET` and `HEAD` requests should redirect (301 response) while any other methods (`PUT`, `PATCH`, `DELETE`, and `POST`) should technically be blocked (400 or 404 response). I tend to agree with this view since these methods should only be called from within the correct (redirected) site while `GET` requests will most likely come from old links etc. – zelanix Jun 06 '15 at 19:09
@VanderHoorn I have a redirection loop with => redirect {|params, req| "http://bar.tld/#{params[:path]}"} and a non secure alert with => redirect {|params, req| "//bar.tld/#{params[:path]}"}, what should i do ? – jmcastel Feb 13 '16 at 08:54
I think you want to escape the dot in the domain, i.e. `/foo\.tld/`. Also might want to match end of string, i.e. `/foo\.tld$/` so as not to redirect requests to http://foo.tld.bar.tld/path. – Felix Livni Jul 16 '17 at 00:09
You usually don't want to redirect via POST. It's a little misleading. – Weihang Jian Mar 21 '22 at 05:52

score 6 · Answer 2 · edited May 12 '22 at 20:14

6

This does the job of the other answer. Though in addition, it preserves query strings as well. (Rails 4):

# http://foo.tld?x=y redirects to http://bar.tld?x=y
constraints(:host => /foo.tld/) do
  match '/(*path)' => redirect { |params, req|
    query_params = req.params.except(:path)
    "http://bar.tld/#{params[:path]}#{query_params.keys.any? ? "?" + query_params.to_query : ""}"
  }, via: [:get, :post]
end

Note: If you're dealing with full domains instead of just subdomains, use :domain instead of :host.

edited May 12 '22 at 20:14

Sven R.

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answered Dec 01 '14 at 01:06

Amin Ariana

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2

Actually `"http://bar.tld#{req.fullpath}"` because `req.fullpath` already contains the leading forward slash. – zelanix Jun 04 '15 at 21:53

score 4 · Answer 3 · answered Jun 22 '20 at 18:39

4

similar to other answers, this one worked for me:

# config/routes.rb
constraints(host: "foo.com", format: "html") do
  get ":any", to: redirect(host: "bar.com", path: "/%{any}"), any: /.*/
end

answered Jun 22 '20 at 18:39

schpet

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score 3 · Answer 4 · edited May 23 '17 at 12:10

The following solution redirects multiple domains on GET and HEAD requests while returning http 400 on all other requests (as per this comment in a similar question).

/lib/constraints/domain_redirect_constraint.rb:

module Constraints
  class DomainRedirectConstraint
    def matches?(request)
      request_host = request.host.downcase
      return request_host == "foo.tld1" || \
             request_host == "foo.tld2" || \
             request_host == "foo.tld3"
    end
  end
end

/config/routes.rb:

require 'constraints/domain_redirect_constraint'

Rails.application.routes.draw do
  match "/(*path)", to: redirect {|p, req| "//bar.tld#{req.fullpath}"}, via: [:get, :head], constraints: Constraints::DomainRedirectConstraint.new
  match "/(*path)", to: proc { [400, {}, ['']] }, via: :all, constraints: Constraints::DomainRedirectConstraint.new

  ...
end

For some reason constraints Constraints::DomainRedirectConstraint.new do didn't work for me on heroku but constraints: Constraints::DomainRedirectConstraint.new worked fine.

score 2 · Accepted Answer · edited Aug 11 '23 at 13:51

2

Bit more modern approach:

constraints(host: 'www.mydomain.com') do
  get '/:param' => redirect('https://www.mynewurl.com/:param')
end

edited Aug 11 '23 at 13:51

John Bachir

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answered May 28 '19 at 14:21

DonMB

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Good answer, but (in Rails 5, at least) the param needs to be included in `%{}`. This would give you: `get '/:param', to: redirect('https://www.mynewurl.com/%{param}')` – James Hibbard Dec 16 '19 at 12:27

score 1 · Answer 6 · answered Feb 03 '20 at 08:02

constraints(host: /subdomain\.domain\.com/) do
  match '/(*path)' => redirect { |params, req|
    "https://www.example.com#{req.fullpath}"
  }, via: [:get, :head]
end

I use this when using custom domains on Heroku and I want to redirect from the myapp.herokuapp.com -> www.example.com.

How can I use Rails routes to redirect from one domain to another?

6 Answers6

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