Rails: how to get the current host, or build a URL with it? [duplicate]

ruby-on-rails ruby url host

I often use a before_filter in ApplicationController to set an instance variable with the host name, something like this:

@hostname = request.host || "www.mydomain.com"

You can also use request.port to get the port number which the request came through (taken from the HTTP headers).

ruby-on-rails ruby url host

Basically you need to generate url based on the current url and some other port number.it can be done as -

request.url(:port => 20)

On rails console

app.root_url(:port => 20) => "http://www.example.com:20/"

To extract host from url use

request.host

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