I'm setting up Apache2 as a reverse proxy for a remote site. Let's assume the remote site is http://app.remotesite.com. Here is a snippet from my virtual host config:
ProxyPass /pxy/ http://app.remotesite.com/
I am getting a "Bad request" when I try this. Based on the output in /var/log/apache2/error.log, it is doing the proxy correctly, but it looks like when it connects to the remote site it does so with its IP address. If I take that IP address (printed in error.log) and do a request with it, e.g. http://[IP address]/search?q=abc, I get the same "Bad request" error. My hypothesis is that the remote site is relying on the hostname to serve the request properly, but mod_proxy is not sending it over. I know about the ProxyPreserveHost setting, but this is for preserving the original hostname in the proxy request (in this case, app.mysite.com) which is not what I want.
Can anyone suggest a way for me to force mod_proxy to use the remote site's hostname in its request? Or, if my hypothesis does not make sense, point out what else might be going wrong?