Re: Using Apache as proxy in port-forwarding role (inward to misbehaving NATted devices)

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Cameron Simpson wrote:
It does help if the internal device doesn't embed absolute URLs in its
web page output (which it may not, even if it looks like it
superficially).

...

If the internal devices are embedding absolute URLs in their HREF links
you may need to run, additionally, a squid on your _local_ box, that
intercepts outbound URLs with the bad links and rewrites them (using the
http_redirect plugin), and then use that squid as your proxy.

This problem can also be solved using the Apache module mod_proxy_html.

From 'http://apache.webthing.com/mod_proxy_html/':

mod_proxy_html is an output filter to rewrite HTML links in a proxy situation,
 to ensure that links work for users outside the proxy. It serves the same
purpose as Apache's ProxyPassReverse directive does for HTTP headers, and is
 an essential component of a reverse proxy.

Depending on your application, there are several Apache modules that you may need to get the proxy working correctly. Here are a couple of references to help you sort things out:

 * http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
 * http://www.apachetutor.org/admin/reverseproxies

Good luck,

Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer

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