How can a rails app get its host name?

rubyonrails-talk
1

I would like my Rails app to supply a callback url to another app. I currently have a yaml file in the config folder in which I put the host name, but I would like to be able to query that dynamically and do away with the yaml file. Is there a method call that returns the current host?

2

Sort of - a given request has a host name (look at the methods on ActionController::Request), obviously you can only get at that inside a controller action.

Fred

3

request.host

4

explainer wrote:


I would like my Rails app to supply a callback url to another app. I
currently have a yaml file in the config folder in which I put the
host name, but I would like to be able to query that dynamically and
do away with the yaml file. Is there a method call that returns the
current host?
--

You should be able to do "name = system ‘hostname’ " if you are on a linux host. This will not give the name used by a virtual host though.

5

Try request.env['HTTP_HOST'] in the controller.

6

That assumes you are on the default port (80).

7

To find what the machine thinks its own name is (which may or may not be related to the hostname you want in a callback url), try:

  Socket.gethostname

As has been pointed out, the callback url also needs things like the port. If you are generating this within a controller action, you could of course just use the url_for() helper to generate the callback url.

8

request.env["SERVER_ADDR"] // this will return you server ip address request.server_name or request.host // this will return host name

9

An example that has caused me to have to use a config.yml, ActionMailer will not have request.* available. System calls would not work in this case either, since they would return a bad value on vhosts or in cases where the hostname is different than request.host.

-eric

10

request.host_with_port()

in rails 2.3.4 api

11 
I would like my Rails app to supply a callback url to another app. I
currently have a yaml file in the config folder in which I put the
host name, but I would like to be able to query that dynamically and
do away with the yaml file. Is there a method call that returns the
current host?

probably you want to write a little rack middleware app here,

check this link and the comments with code underneath,

http://coderack.org/users/laktek/entries/11-server-proxy

12

check database.yml file in config directory