Rails - Jun 2007 - 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       rdm-go8te9J4rpw@public.gmane.org
      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 Morin
http://www.cfcl.com/rdm/resume     rdm-go8te9J4rpw@public.gmane.org
http://www.cfcl.com/rdm/weblog     +1 650-873-7841

Technical editing and writing, programming, and web development

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