Setting up custom domain on Heroku with CNAME redirect for www subdomain [closed]
-
28-09-2019 - |
Question
I'm using Heroku, and have added a couple custom domains for my app, i.e. myapp.com
and www.myapp.com
.
My DNS at GoDaddy has three A records for '@' pointing to three separate Heroku IPs, and a CNAME for the 'www' subdomain that points to proxy.heroku.com
.
What I want to do is redirect any traffic to www.myapp.com
to myapp.com
. I tried setting the CNAME to '@', but that still remains at the same domain. Is there a way I can force this redirect at the DNS level?
Solution
CNAME is not a redirect but only a canonical name for your domain. That means that it behaves just like the domain it points to (myapp.com in your case). Your browser gets the same IP address as myapp.com has and sends a request to it.
Redirects are performed at the HTTP level or above. You can do this for example in your app or create another simple app just for that.
Here's a simple example to do the redirect directly in your app:
# in your ApplicationController
before_filter :strip_www
def strip_www
if request.env["HTTP_HOST"] == "www.myapp.com"
redirect_to "http://myapp.com/"
end
end
Or you could use rails metal, which would do the same, but much faster:
# app/metal/hostname_redirector.rb
class HostnameRedirector
def self.call(env)
if env["HTTP_HOST"] == "www.myapp.com"
[301, {"Location" => "http://myapp.com/"}, ["Found"]]
else
[404, {"Content-Type" => "text/html"}, ["Not Found"]]
end
end
end
You could also use a Regex to match all requests with www.
in front of the hostname.
OTHER TIPS
And here's a solution for node.js
$ heroku config:set APP_HOST=yourdomain.com
app.configure('production', function() {
// keep this relative to other middleware, e.g. after auth but before
// express.static()
app.get('*', function(req, res, next) {
if (req.headers.host != process.env.APP_HOST) {
res.redirect('http://' + process.env.APP_HOST + req.url, 301)
} else {
next()
}
})
app.use(express.static(path.join(application_root, 'static')))
})
This will also redirect domain.herokuapp.com to yourdomain.com, preventing search engines indexing duplicate content.
You can also do this pretty easily in any Rack app, by installing the rack-canonical-host
gem and putting this in your Rack config file:
require 'rack-canonical-host'
use Rack::CanonicalHost, 'myapp.com'