My Host

[John Hinnegan]

I need to get some absolute redirects working -- basically I set callback hooks to external services, but I want these hooks to use my configured CNAME's.  I'm trying to find a way so that my app doesn't have to know about these CNAME's.  So I'm looking at the request in the controller to try and get the base URL where I'm running.

To test, I'm using localtunnel.  I have found what I'm looking for in 3 places, and I'm wondering if one is better than another or if one is more reliably set than another.

request.env["SERVER_NAME"]

request.host

request.env["HTTP_HOST"]

All three of these have the value I'm looking for (e.g. "3eym.localtunnel.com") .  Is there any difference between them?  Should I favor one over another?

[Philip Hallstrom]

I'd use request.host...

That calls raw_host_with_port (and trims the port). raw_host_with_port looks like this:

def raw_host_with_port
if forwarded = env["HTTP_X_FORWARDED_HOST"]
forwarded.split(/,\s?/).last
else
env['HTTP_HOST'] || "#{env['SERVER_NAME'] || env['SERVER_ADDR']}:#{env['SERVER_PORT']}"
end
end

So does some extra checking for you...

https://github.com/rails/rails/blob/5f67cfeda116f2b932ef72781420aa37e62437ca/actionpack/lib/action_dispatch/http/url.rb#L92

-philip

[John Hinnegan]

thank you