Problem with redirect_to() and VirtualHost

I’m running into a problem with redirect_to() and Apache’s
VirtualHost facility. I have probably have something set up
wrong, but I’m not even sure how to approach the problem.

Background:

We have DNS set up to return the domain’s address for all
sub-domains. So, “dig xyz.cfcl.com” returns the same IP
address as “dig cfcl.com”.

Our router forwards ranges of port numbers to specified
machines. So, a request on port 1234 might go to “fido”.

We are using Apache’s VirtualHost facility to redirect (?)
requests to certain machines, as:

<VirtualHost *:80>
  ServerName        xyz.cfcl.com
  ServerAdmin       [email protected]
  ErrorLog          /dev/null
  CustomLog         /dev/null common
  ProxyRequests     Off
  ProxyPass         /  http://fido.cfcl.com:1234/
  ProxyPassReverse  /  http://fido.cfcl.com:1234/
</VirtualHost>

As a result, requests to http://xyz.cfcl.com are answered
by a Rails server that is set up to answer port 1234 on
fido.cfcl.com. This (mostly) works fine, both inside and
outside of the LAN.

Problem:

If a user enters an invalid value into a form, we want to
set up the “flash” hash and redirect back to the page that
contained the form. Something like:

flash[:notice] =  get_errors()
redirect_to(:back)

This works (on the LAN) when the URL of the form page is:

http://fido.cfcl.com:1234/conf/edit_new

However, if the URL is:

http://xyz.cfcl.com/conf/edit_new

the redirect results in:

Proxy Error

The proxy server received an invalid response from an
upstream server.

The proxy server could not handle the request POST
/conf/create.

Reason: Document contains no data

The server says:

[2007-06-21 14:18:42] ERROR URI::InvalidURIError:
the scheme http does not accept registry part:
xyz.cfcl.com (or bad hostname?)
/usr/local/lib/ruby/1.8/uri/generic.rb:729:in `merge'
...

Any ideas on what might be wrong or (better) how to fix it?

-r

http://www.cfcl.com/rdm Rich M.
http://www.cfcl.com/rdm/resume [email protected]
http://www.cfcl.com/rdm/weblog +1 650-873-7841

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