[Rails] Re: default error page

[Eric Anderson]

Raffaele Tesi wrote:
> I need redirection to a custom error page, instead of
> the default Rails messages (e.g. Unknown action).
> I use WebRick, no Apache, and i think i can't use
> public/.htaccess (# General Apache options).

You will need to ensure that the following is set in your configuration 
environment:

ActionController::Base.consider_all_requests_local = false

If you are using the production environment this will already be set. If 
you are using the development environment then you will need to change this.

Next you will need to figure out who should receive the custom error 
message and who should receive the stack trace. Then overwrite the 
"local_request?" method in your controller (or your 
ApplicationController to make it affect all controllers) to determine 
for your application when a request is local and when it is a remote 
user. The default implementation of local_request? is:

def local_request? #:doc:
	@request.remote_addr == "127.0.0.1"
end

So a request will be considered local if it comes from the local 
machine. Otherwise it will be considered remote. Local requests are 
given the stack trace. Remote requests are given the custom error page 
(/public/500.html).

The documentation and information on all this is on:

/vendor/actionpack/lib/action_controller/base.rb:192-196
/vendor/actionpack/lib/action_controller/rescue.rb:54-59

Hope that helps!

Eric
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