Apache Reverse proxy to fight DNS propagation

Question

I have been following this tutorial to set up a reverse proxy. I have moved some sites to a new server, and changing the DNS for a lot of alias domains is going to take a while. To minimize issues, I want to redirect all traffic to the new location with a reverse proxy.

It does work, but I get a default page on the new server while configuration is exactly the same and editing my hosts file does work.

This is the config that I'm using:

 <VirtualHost *:80> ServerName domain.com ServerAlias *.domain.com ServerAlias domain2.com *.domain2.com ErrorLog ${APACHE_LOG_DIR}/proxy-error.log CustomLog ${APACHE_LOG_DIR}/proxy-access.log combined ProxyRequests Off ProxyPass / http://x.x.x.x/ ProxyPassReverse / http://x.x.x.x/ </VirtualHost>

Does it has something to do with the fact that I use http://ip_adress/ for the ProxyPass condition?

I'd think that ProxyPass with an IP address simply does not pass the required Host header — Håkan Lindqvist
– Håkan Lindqvist, Commented Sep 2, 2020 at 12:49
Maybe httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost would do the trick — Håkan Lindqvist
– Håkan Lindqvist, Commented Sep 2, 2020 at 12:50

Michael Hampton · Accepted Answer · 2020-09-02 15:51:31Z

This setup requires that the original Host: header be passed onward from your proxy to the new origin server.

This is done with ProxyPreserveHost:

 ProxyPreserveHost On

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