I am having trouble with my Apache web server configuration since a number of remote clients receive 404s, while the majority of clients (me, locally, included) do not have any trouble (status 200). Hence, for the sake of debugging, I'd like to send test queries (via curl) to the web server as if the request came from a certain remote IP and examine the responses.
Is this even possible? I understand that IP spoofing is not a desirable feature for regular Internet packages, but is there a way to achieve something similar locally when I am in full control of my web server?
Any help is appreciated.